> > Node.js MCQs > Basic Node.js MCQs

Basic Node.js MCQ

1. Which coice is a core module in Node?

Crypto

Chalk

Webpack

Request

Answer

Correct Answer: Crypto

Note: This Question is unanswered, help us to find answer for this one

2. When exploring the Node documentation's features, what are the stability ratings?

They are an indication of the stability of Nodejs modules and usage recommendations.

They tell if a feature is ES6 compliant.

They are a Node command to validate stability of your code.

They tell if a feature is LTS (Long Term Supported).

Answer

Correct Answer: They are an indication of the stability of Nodejs modules and usage recommendations.

Note: This Question is unanswered, help us to find answer for this one

3. How can ECMAScript modules be used natively in Node?

ECMAScript modules cannot be used natively in Node.

ECMAScript modules can be used natively in Node with the .mjs file extension

ECMAScript modules can be used natively in Node only by using a compiler like Babel.

ECMAScript modules can be used natively in Node only by using a bundle like webpack.

Answer

Correct Answer: ECMAScript modules cannot be used natively in Node.

Note: This Question is unanswered, help us to find answer for this one

4. What is the importance of having good practices around status code in your response?

It indicates success or failure to the client and helps with testing.

It is not important to have good practices regarding status codes

Response codes are the only way you can tell what is happening on the server.

It contains information about the current performance of the server.

Answer

Correct Answer: It contains information about the current performance of the server.

Note: This Question is unanswered, help us to find answer for this one

5. What is used for parsing and running Javascript in Node.js?

EventLoop

Libuv

Google V8

Express.js

Answer

Correct Answer: Google V8

Note: This Question is unanswered, help us to find answer for this one

6. How does it affect the performance of a web application when an execution path contains a CPU-heavy operation, such as calculating a long Fibonacci sequence?

As Node.js is asynchronous, this is handled by a libuv and a threadpool. The performance will not notably degrade.

As the application code runs asynchronously within a single thread, the execution will block, accepting no more requests until the operation is completed.

As Node.js is asynchronous, this is handled by a threadpool and the performance will not notably degrade.

The current thread will block until the executon is completed and the operating system will spawn new threads to handle incoming requests. This can exhaust the number of allowed threads (255) and degrade performance over time.

Answer

Correct Answer: The current thread will block until the executon is completed and the operating system will spawn new threads to handle incoming requests. This can exhaust the number of allowed threads (255) and degrade performance over time.

Note: This Question is unanswered, help us to find answer for this one

7. What is Node built on?

Python

V8 JavaScript engine

PHP

Answer

Correct Answer: V8 JavaScript engine

Note: This Question is unanswered, help us to find answer for this one

8. Which assert module method is usually used to test the error-first argument in callbacks?

Fail

DoesNotThrow

DeepStrictEqual

IfError

Answer

Correct Answer: IfError

Note: This Question is unanswered, help us to find answer for this one

9. Is it possible to write tests in Node.js without an external library?

Yes, through the assert module

Yes, through the debugger module

Yes, through the console module

Answer

Correct Answer: Yes, through the assert module

Note: This Question is unanswered, help us to find answer for this one

10. What is a process object and its role?

A locally scoped object that provides information about the current node process

A global object that provides information about files

A global object that provides information about the database

A global object that provides information about the current node process

Answer

Correct Answer: A global object that provides information about the current node process

Note: This Question is unanswered, help us to find answer for this one

11. What is the purpose of N-API?

To allow users to make requests to the server

To insulate Addons from changes in the underlying JavaScript engine

To execute multi-threaded code in the Node environment

To provide a quick way for users to create REST APIs

Answer

Correct Answer: To insulate Addons from changes in the underlying JavaScript engine

Note: This Question is unanswered, help us to find answer for this one

12. How can you convert path segments into a string using the platform-specific separator as a delimiter?

Path.concat

Path.join

Path.format

Path.parse

Answer

Correct Answer: Path.join

Note: This Question is unanswered, help us to find answer for this one

13. What is the correct way to pipe a readable stream and a writable stream?

ReadableStream.pipe(writableStream)

ReadableStream.on(pipe, writableStream)

WritableStream.pipe(readableStream)

WritableStream.on(pipe, readableStream)

Answer

Correct Answer: ReadableStream.pipe(writableStream)

Note: This Question is unanswered, help us to find answer for this one

14. Which choice is not a Node global object?

Process

Exports

SetTimeout

Buffer

Answer

Correct Answer: Buffer

Note: This Question is unanswered, help us to find answer for this one

15. You have to read a large text file, replace some words in it, and write it back to a new file. You know that the memory on your target system is limited. What should you do?

Use regular expressions directly on the file.

Use Promises and async/await to offload the task to libuv.

Copy the file into a database and perform the operations there.

Use readline together with streams to read and transform and write the file contents line by line.

Answer

Correct Answer: Use readline together with streams to read and transform and write the file contents line by line.

Note: This Question is unanswered, help us to find answer for this one

16. How would you determine the number of cluster instances to start when using the cluster module?

Const numInstances = cluster.instances().length;

Const numInstances = cluster.instances();

Const numInstances = require('os').cpus().length;

Const numInstances = process.cpus().length;

Answer

Correct Answer: Const numInstances = require('os').cpus().length;

Note: This Question is unanswered, help us to find answer for this one

17. Which core module in Node can you use to compile and run JavaScript code in a sandbox environment?

Sandbox

Buffer

Answer

Correct Answer: Vm

Note: This Question is unanswered, help us to find answer for this one

18. Which statement about event emitters is false?

Event names must be camelCase strings.

The emit method allows a arbitrary set of arguments to be passed to the listener functions.

Any values returned by the listeners for an emitted events are ignored.

When an event emitter objeect emits an event, all of the functions attached to that specific event are called synchronously.

Answer

Correct Answer: Event names must be camelCase strings.

Note: This Question is unanswered, help us to find answer for this one

19. Which statement is true about Node.js and threads?

Every Node process runs in a single thread, and all the I/O work is run in that same thread.

Every Node process gets four threads that it can share between its JavaScript VM and the event loop.

The event loop is single-threaded, but a JavaScript VM can use multiple threads.

JavaScript execution in Node.js is single-threaded, but I/O operations are executed using multiple threads.

Answer

Correct Answer: The event loop is single-threaded, but a JavaScript VM can use multiple threads.

Note: This Question is unanswered, help us to find answer for this one

20. Which global object acts like a bridge between a Node script and the host operating system?

Env

Process

Child_process

Answer

Correct Answer: Process

Note: This Question is unanswered, help us to find answer for this one

21. Which Node.js module should you use when you need to decode raw data into strings?

Buffer

Util

String_decoder

String_buffer

Answer

Correct Answer: String_decoder

Note: This Question is unanswered, help us to find answer for this one

22. Which core module in Node provides an API to register callbacks to track asynchronous resources created inside a Node.js application?

Cluster

Async_hooks

Dgram

Inspector

Answer

Correct Answer: Async_hooks

Note: This Question is unanswered, help us to find answer for this one

23. Which core module in Node can you use for testing?

Chai

Jest

Assert

Mocha

Answer

Correct Answer: Assert

Note: This Question is unanswered, help us to find answer for this one

24. Which file does node-gyp use to read the build configuration of a module?

.gyprc

Binding.gyp

Gyp.json

Package.gyp

Answer

Correct Answer: Binding.gyp

Note: This Question is unanswered, help us to find answer for this one

25. What does REPL stand for?

Run, examine, put, loop

Read, eval, print, loop

Run, edit, print, loop

Read, extend, print, loop

Answer

Correct Answer: Read, eval, print, loop

Note: This Question is unanswered, help us to find answer for this one

26. According to the rules of semantic versioning, what does a release incrementing the third number in an npm version string communicate to users about the release changes?

Changes are not backwards compatible.

Changes might not be backward compatible and might break existing code.

Changes are just bug fixes and no new features were added.

Changes will add new functionality but will not break any existing code.

Answer

Correct Answer: Changes are just bug fixes and no new features were added.

Note: This Question is unanswered, help us to find answer for this one

27. Which line imports a promise-based version of the readFile method?

Const { readFile } = require(fs).promises

Const { readFile } = require(fs)

Const { readFilePromises: readFile } = require(fs)

Const { readFile } = require(promises)

Answer

Correct Answer: Const { readFile } = require(fs).promises

Note: This Question is unanswered, help us to find answer for this one

28. Which core Node module has wrappers for OpenSSL methods?

SSL

Hash

Crypto

TLS

Answer

Correct Answer: Crypto

Note: This Question is unanswered, help us to find answer for this one

29. Which core module in Node can you use to take advantage of multicore systems?

Util

Cluster

Net

Answer

Correct Answer: Cluster

Note: This Question is unanswered, help us to find answer for this one

30. What can you export with module.exports?

Only objects.

Only functions

Only variables and arrays

Functions, objects, arrays, or anything you assign to the module

Answer

Correct Answer: Functions, objects, arrays, or anything you assign to the module

Note: This Question is unanswered, help us to find answer for this one

31. What does the .node file extension represent?

A C++ file that can have a .node extension and that Node will be able to execute directly.

A C++ Addon file that is built with node-gyp

A JSON file that can have a .node extension as well as the .json extension

A JavaScript file that can have a .node extension as well as the .js extension

Answer

Correct Answer: A C++ Addon file that is built with node-gyp

Note: This Question is unanswered, help us to find answer for this one

32. Which library provides Node.js with the event loop?

C-ares

Libuv

Events

Answer

Correct Answer: Libuv

Note: This Question is unanswered, help us to find answer for this one

33. What are the arguments passed to the module wrapper function?

Exports, __filename, __dirname

Exports, process, require, module, __filename, __dirname

Exports, module, __filename, __dirname

Exports, require, module, __filename, __dirname

Answer

Correct Answer: Exports, require, module, __filename, __dirname

Note: This Question is unanswered, help us to find answer for this one

34. What is the command to get a list of available commands for Node.js?What is the command to get a list of available commands for Node.js?

Node index.js -x

Node -v

Node -h

Node index.js -h

Answer

Correct Answer: Node -h

Note: This Question is unanswered, help us to find answer for this one

35. Which choice is not a valid method on event emitters?

Start

Once

Off

Answer

Correct Answer: Start

Note: This Question is unanswered, help us to find answer for this one

36. You have a script.js file with the single line of code shown here. What will be the output of executing script.js with the node command? console.log(arguments);

ReferenceError: arguments is not defined

An empty string

Undefined

An object representing an array that has five elements

Answer

Correct Answer: An object representing an array that has five elements

Note: This Question is unanswered, help us to find answer for this one

37. Which of the following is NOT a valid stream in Node?

Process. stdinfo

Process. stdin

Process. stdout

Process. stderr

Answer

Correct Answer: Process. stdinfo

Note: This Question is unanswered, help us to find answer for this one

38. What is the Node LTS version?

It is the current unstable version and is to be avoided.

It is the version that will be retired soon.

It is the version with the latest features.

It is the safest version for long-term support.

Answer

Correct Answer: It is the safest version for long-term support.

Note: This Question is unanswered, help us to find answer for this one

39. What is the purpose of the file system (fs) module?

To provide methods to work with requests and responses

To provide methods to work with files

To provide methods to work with databases

To find new file systems

Answer

Correct Answer: To provide methods to work with files

Note: This Question is unanswered, help us to find answer for this one

40. How do you start a Node application, if the entry file is indexjs?

Nodemon start

Start index.js

Node index.js

Node start

Answer

Correct Answer: Node index.js

Note: This Question is unanswered, help us to find answer for this one

41. How do you make an HTTP server object active and listen to requests on certain ports?

Server. start

Server.activate

Server.listen

Server. run

Answer

Correct Answer: Server.listen

Note: This Question is unanswered, help us to find answer for this one

42. What is the purpose of the path module?

To provide utilities to play with file and directory paths

To provide utilities to add and remove files

It is a retiring module.

To provide utilities to test files

Answer

Correct Answer: To provide utilities to play with file and directory paths

Note: This Question is unanswered, help us to find answer for this one

43. When you run JavaScript in a Node.js application, which of the following elements in a Node.js stack actually executes that JavaScript?

The libuv library

The c-ares library

The VM (like VS or Chakra)

The repl module

Answer

Correct Answer: The VM (like VS or Chakra)

Note: This Question is unanswered, help us to find answer for this one

44. Which console method can be used to print the stack trace to the point of its execution?

Stack

Trace

Debug

Answer

Correct Answer: Trace

Note: This Question is unanswered, help us to find answer for this one

45. If the child_process module methods are in scope, what is a current way to execute the command ps -ef using a child process?

Spawn(

Exec(

Fork(

Answer

Correct Answer: Exec(

Note: This Question is unanswered, help us to find answer for this one

46. Which module variable holds the resolved absolute path of the current module file?

__pathname

__location

__flder

__filename

Answer

Correct Answer: __filename

Note: This Question is unanswered, help us to find answer for this one

47. If EventEmitter is in scope, which of the following lines of code will have an event emitter emitting a change event?

EventEmitter.emit('change');

EventEmitter.new().emit('change');

(new EventEmitter()).emit('change');

New EventEmitter('change');

Answer

Correct Answer: EventEmitter.emit('change');

Note: This Question is unanswered, help us to find answer for this one

48. Which statement is true when you run the code shown below? require('child_process').fork('script.js');

The forked process shares the event loop with the parent process

A new VM instance is created and the two VM instances will be shared between the forked process and the parent process.

The forked process will have its own VM instance.

The forked process shares the same VM thread with the parent process.

Answer

Correct Answer: The forked process will have its own VM instance.

Note: This Question is unanswered, help us to find answer for this one

49. How can you use the promise API with a callback-based function such as child_process.exec?

New Promise(child_process.exec())

Util.promisify(child_process.exec())

Util.promisify(child_process.exec)

New Promise(child_process.exec)

Answer

Correct Answer: Util.promisify(child_process.exec)

Note: This Question is unanswered, help us to find answer for this one

50. What is the command to silence all process warnings?

Node index.js --trace-warnings

Node --no-warnings

Node -trace-warnings

Node index.js --no-warnings

Answer

Correct Answer: Node --no-warnings

Note: This Question is unanswered, help us to find answer for this one

51. Which object is used to manage the cache of required modules?

Global.cache

Module.cache

Process.cache

Require.cache

Answer

Correct Answer: Require.cache

Note: This Question is unanswered, help us to find answer for this one

52. Which of the following is a method on the console object?

Exit

Test

Time

Answer

Correct Answer: Time

Note: This Question is unanswered, help us to find answer for this one

53. How can you count the number of logical CPUs on the machine that is running Node?

Node -p

Answer

Correct Answer: Node -p

Note: This Question is unanswered, help us to find answer for this one

54. Which CLI option can you use to debug a node script in Chrome DevTools?

--dev-tools

--inspect

--chrome

--debug

Answer

Correct Answer: --inspect

Note: This Question is unanswered, help us to find answer for this one

55. What is the Api that is designed to insulate Addons from changes in the underlying JavaScript engine?

A-API

Z-API

N-API

X-API

Answer

Correct Answer: N-API

Note: This Question is unanswered, help us to find answer for this one

56. Can you create an https web server with Node.js?

No, there are no modules supporting it yet

Yes, with the https or http2 modules

Yes, through the path module

Yes, with the http module

Answer

Correct Answer: Yes, with the https or http2 modules

Note: This Question is unanswered, help us to find answer for this one

57. How do you check that a value is a date object in Node?

Util.types.isDate(value)

Assert.isDate(value)

Console.isDate(value)

Util.date(value)

Answer

Correct Answer: Util.types.isDate(value)

Note: This Question is unanswered, help us to find answer for this one

58. Which of the following DNS module methods uses the underlying OS facilities and does not necessarily perform any network communication?

Lookup

Resolve

Resolve4

Reverse

Answer

Correct Answer: Lookup

Note: This Question is unanswered, help us to find answer for this one

59. Which fs module method can be used to read the content of a file without buffering it in memory?

Read

ReadFile

CreateReadStream

ReadFileSync

Answer

Correct Answer: CreateReadStream

Note: This Question is unanswered, help us to find answer for this one

60. Which of the following modules is NOT a built-in module in Node?

Ftp

Events

Dgram

Http2

Answer

Correct Answer: Ftp

Note: This Question is unanswered, help us to find answer for this one

61. Which of the following Buffer class methods returns an uninitialized buffer?

AllocUnsafe

Concat

From

Alloc

Answer

Correct Answer: AllocUnsafe

Note: This Question is unanswered, help us to find answer for this one

62. Which of the following is a core module in Node?

Webpack

Crypto

Request

Chalk

Answer

Correct Answer: Crypto

Note: This Question is unanswered, help us to find answer for this one

63.
The given program should generate the following output:{value1: 2222, value2: [ x: 'hello Worldl', y: 8888 ]]However, the program contains errors. Identify which of the given lines of code contain errors.Program
1. var f‌irstvar =[
2. value1: 2222,
3. value2: {
4. xz‘hello World!’
5. y: 8888
6-];
7. };
8. console.log(firstvar);

III Line1

III Line 2

El Line 4

El Line 5

El Line 6

III Line 7

Answer

Correct Answer:

El Line 5

Note: This Question is unanswered, help us to find answer for this one

64. Which of the following statements is/are correct about working with the MongoDB server and the Mongodb module?

III The [w: 0] f‌lag is passed to the database constructor that tells to wait until at least one conf‌irmed write has succeeded.

El A new Db object is required to be created for each incoming request to the application server.

The Mongodb module allows multiple people to work with the database server at the same time.

III The value of the pool size parameter to the Server object constructor is adjusted for choosing the number of connections to be maintained for the MongoDB server.

Answer

Correct Answer: III The [w: 0] f‌lag is passed to the database constructor that tells to wait until at least one conf‌irmed write has succeeded.
The Mongodb module allows multiple people to work with the database server at the same time.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

65. Carefully study the code snippet given in the image and determine which of the following lines of code contain errors.

[Fl Line1

El Line3

Ll Line 4

El Line 5

U Line 6

Answer

Correct Answer: [Fl Line1
Ll Line 4

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

66.
Carefully study the following Node.js code snippet and answer the question that follows.
1. var var1 =(

2. xz50.

3. y :"This is a string",

4. z : false

5. ];

6. varjson_example = stringify.JSON(var1);

7. console.log(json_example);

8. console.log(typeofjson_example );

9. var json_example1 = JSON.parse(var1);

10. console.log(json_example1);

11. console.log(json_example1.y)
Which of the following lines of code contain an error?

Line 4

Line 5

Line 6

Line 8

Line 9

Line 11

Answer

Correct Answer:

Line 6

Note: This Question is unanswered, help us to find answer for this one

67.
The given program should generate the following output:
The values are: [ [ Value: 15 }, [Value: 8 }]However, the program contains some errors. Identify which code lines contain an error.
1) function addValue(val1. va|2)[
2) setTimeout(function(){
3) val2(null. [Value: val1]);
4) ), 500);
5)]
6) function valuesLoaded (loadedVaIues){
7) console.log(‘The values are:'. loadedVaIues);
8)]<
9) var a = require(Async);
10) a.parallel([function(val) [
11) addValue(15, val);
12) l.
13) function(val)[
14) addValue(val, 8);
15)]
16) ],valuesLoaded)

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

68. Which two of the following statements will generate the output "Hello Node.js"?

Console.log(“Hello Node.js

console.log(‘Hello Node.js');

console.log(

Console.log('HelIo Node.js');

console.Log('Hello World');

Answer

Correct Answer: console.log(

Note: This Question is unanswered, help us to find answer for this one

69. Which of the following is/are not (a) valid state(s) of promise used in Node.js?

Settled

Pending

Fulf‌illed

Sleeping

Rejected

Answer

Correct Answer: Fulf‌illed

Note: This Question is unanswered, help us to find answer for this one

70.
A Node.js application consists of an HTML file named ‘idx.html' and a JavaScript f‌ile 'ht3.js'. The f‌ile ht3.js when executed, should display the content of 'idx.html' file on the web browser. However, the f‌ile 'ht3.js' contains some errors. Identify which code lines contain an error.

1. var http = require(‘http');

2. var fs;

3. function send404(response){

4. response.writeHead(404. ['Content—Type' :‘text/plain'});

5. response.write('Error 404: Resource not found');

6. response.end0:

7. }

8. var server =http.createServer(function(req. res)[

9. if(req.method = 'GET', req.url =‘/')[

10. res.writeHead(200, ['content-type' : 'text/html'});

11. fs.createReadStream('idx.html')

12. ]

13. else[

14. send404fres);

15. ]

16. ]).listen(3000);

17. console.logf'server running on port 3000');

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

71.
The following program was designed to create an Express app that displays the output "Working with Express" on the web browser. But the program contains some errors. Identify which code lines contain
an error.

1) var exp1= require('express');
2) var http: require('http‘);
3) var newapp = exp1()
4) use(function(req. res. next) [
5) res.end('Working with Express');
6) i):
7) https.createServer(newapp).listen(3000);

Line 3

[i Line 4

El Line 5

[1 Line 6

III Line 7

Answer

Correct Answer:

III Line 7

Note: This Question is unanswered, help us to find answer for this one

72. Which of the following classes is/are always used for connecting to a MongoDB server?

Connection

Server

ObjectlD

Handler

El FileObject

Answer

Correct Answer: Db
Connection

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

73.
The program given in the image should create a web page with a simple label "Enter name", a text-boxand a button. Initially, the text-box should display "NAME" as its content. The content of the text-boxshould be cleared each time the button is clicked. However, the program contains some errors. Identifywhich code lines contain an error.

11 & 12

14 & 15

Answer

Correct Answer:

14 & 15

Note: This Question is unanswered, help us to find answer for this one

74.
What will be the output of the following code snippet in Node.js?
var x = 2.4;
var y = 9;
console.log(y/x)

3.75

4.5

It will generate an error.

Answer

Correct Answer:

3.75

Note: This Question is unanswered, help us to find answer for this one

75.
Carefully study the following code snippet and answer the question that follows:
new_function (true, function (data){
func1(); });
func2();
function func1(){console.log("Clouds")}
function func2(){console.log("Sunshine")}
function new_function (ar1, ar2) {
if (ar1) {
???
}
else {
setTimeout(function () {
ar2()
}, 1000);
} }
Which of the given code lines should be written in place of "???" in the above program so that the following output is obtained?

Sunshine

Clouds

(function (){

ar2();

});

nextTick(function () {

ar1;

});

data process.nextTick(function (ar2) {

ar1();

});

process.nextTick(function () {

ar2();

});

data.nextTick(function () {

ar2;

});

Answer

Correct Answer:

(function (){

ar2();

});

process.nextTick(function () {
ar2();
});

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

76.
A Node.js project consists of three files: app1.js, app2.js, and app3.js.
The code snippets of each of these files are given below. If we execute app2.js, then what output will be obtained?
app1.js module.exports = {value1: "Hello"}
app2.jsvar app1 = require("./app1");
console.log("Initial value:",app1.value1);app1.value1 = "World';var
app3 = require("./app3");
app3.jsvar app3 = require("./app2");
console.log("Final value:", app3.value1);

Initial value: Hello

Final value: Hello

Initial value: Hello

Final value: World

Initial value: Hello

Final value: undef‌ined

Initial value: Hello

No output will be displayed due to an error in the program.

Answer

Correct Answer:

Initial value: Hello

Final value: undef‌ined

Note: This Question is unanswered, help us to find answer for this one

77.
In the following program of an asynchronous test, which line of code contains an error?
Line 1: exportsaynchabc = function (abc)[
Line 2: setTimeout(function (){
Line 3: abc.equal(false, true);
Line 4: abc.done(true. false);
Line 5: } 1200);
Line 6: };

Line 2

Line 3

Line 4

Line 5

Answer

Correct Answer:

Line 5

Note: This Question is unanswered, help us to find answer for this one

78.
What will be the output of the following code snippet?
var x =[8, 12, 3];
x.push(5);
x.unshift(1);
console.log(x[0]);

It will generate an error.

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

79. In Node.js, which of the following functions is used by an Express app to accept the middleware?

param

use

put

get

Answer

Correct Answer: use

Note: This Question is unanswered, help us to find answer for this one

80.
Carefully read the following code:
1. var EventEmitter = require("events").EventEmitter;
2. var example = new EventEmitter();
3. example.on('data', function sample1(){});
4. example.on('data', function sample2(){});
5. console.log(???);
Which of the given options should replace ??? in line 5 of the above-given code snippet to obtain the following output? [ [Function: sample1], [Function: sample2] ]

example.listeners('data')

listener(example.data)

example.listeners.data

listener, example('data')

Answer

Correct Answer:

example.listeners('data')

Note: This Question is unanswered, help us to find answer for this one

81.
Consider two files: first.js and second.js in a Node.js project. Content of the first.js file is given as:
module.exports = function() {
console.log("function in file first");
Which of the following lines of code should be written in the second.js file in order to import the function given in the first.js file to the second.js file?

require(./first);

First;

var x = require(first);

x();

var x = require(.first);

var x = require('./first');

x();

Answer

Correct Answer:

var x = require('./first');

x();

Note: This Question is unanswered, help us to find answer for this one

82. Which of the following is the purpose of installing the NPM module, optimist?

It exports an object that creates a global variable '_'.

It exports an object that contains the parsed command line argument in the form of argv property.

It exports a large number of open source Node.js packages.

It exports mathematical functions to the application.

Answer

Correct Answer: It exports an object that contains the parsed command line argument in the form of argv property.

Note: This Question is unanswered, help us to find answer for this one

83. Which of the following operators checks whether the given f‌ield is an array and contains all the values in the given array of values or not?

$all

$in

$ne

$lte

$nin

Answer

Correct Answer: $all

Note: This Question is unanswered, help us to find answer for this one

84.
State if true or false.
In node.js, applications are processed asynchronously on a single thread.

True

False

Answer

Correct Answer:

True

Note: This Question is unanswered, help us to find answer for this one

85. Which of the following command line arguments can be used to convert a file named "base3.js" into an AMD module?

browserify amdmodule -o base3.js

amdmodule.js browserify base3.js -o

amdmodule browserify -o base3.js

browserify base3.js -o amdmodule.js

Answer

Correct Answer: browserify base3.js -o amdmodule.js

Note: This Question is unanswered, help us to find answer for this one

86.
What will be the output of the following program?
var name = "John";
var dob = 15;
console.log("%s was born on %d May, 1987", name, dob)

John was born on 15 May, 1987

was born on May, 1987, John, 15

John was born on 15 May, 1987, John, 15

%s was born on %d May, 1987, John, 15

No output will be displayed due to an error in the program.

Answer

Correct Answer:

John was born on 15 May, 1987

Note: This Question is unanswered, help us to find answer for this one

87.
Choose True or False.

In MongoDB, it is possible to insert two values with same_id values into a collection.

True

False

Answer

Correct Answer:

False

Note: This Question is unanswered, help us to find answer for this one

88.
What will be the output of the following Node.js code snippet?
var EventEmitter = require("events").EventEmitter;
Var er = new EVentEmitter();
var handler1 = function () {
console.log('Called the handler');
er.removeListener('example', handler1); };
er.on('example', handler1);
er.emit('example');
er.emit('example');

Called the handler

No output will be displayed due to an error in the program.

Answer

Correct Answer:

Called the handler

Note: This Question is unanswered, help us to find answer for this one

89.
Which of the following is/are true about the http.ServerResponse object in Node.js?
1. It is created by an HTTP server.
2. It is passed as f‌irst parameter to the "request" event.
3. It is a writable stream.

Only1

Only 2

Only 2 and 3

Only1 and 3

All 1, 2, and 3

Answer

Correct Answer:

Only1 and 3

Note: This Question is unanswered, help us to find answer for this one

90.
Suppose we have the following code in a Node.js f‌ile.
var path = require("path");
var completePath ='lexample/test/f‌irsthtml';
Which of the following lines of code should be added to the above code so that the output 'f‌irst.html' is displayed?

console.log(path.f‌ilename(completePath));

console.log(path.basename(completePath));

console.log(path.extname(completePath));

console.log(path.f‌irstname(completePath));

Answer

Correct Answer:

console.log(path.basename(completePath));

Note: This Question is unanswered, help us to find answer for this one

91.
What output will be generated on the execution of the following code snippet in Node.js?
function Test()
{}
console.log(Test.prototype.constructor === Test);

true

false

Test

No output will be displayed due to an error in the program.

Answer

Correct Answer:

true

Note: This Question is unanswered, help us to find answer for this one

92.
Carefully study the given code that is calling the loadJSON method and answer the question that follows.
loadJSON("new.json", function (err, data)
{ if(err)console.log("Error in file reading", err.message);
else
console.log(data);
});
Which of the following is the correct function definition of the loadJSON method such that if a file named "neW.json" is present in the project, then its data is displayed, otherwise error message (error in file reading) is displayed?

function loadJSON(file_name, arg){

file1.readFile(file_name, function(error1, data){

if(error1)return arg();

try{

arg(null, JSON.parse(data)); }

catch(error1) {

return arg(error1);

}

return arg(null);

}); }

function loadJSON(file_name, arg){

file1.readFile(file_name, function(error1, data){

if(error1)return arg(error1);

try{

var new_parse =JSON.parse(); }

catch(error1) {

return arg(error1); }

return arg(new_parse);

}); }

var file1 = require('fs');

function loadJSON(file_name, arg){

file1.readFile(file_name, function(error1, data){

if(error1)return arg(error1);

try{

var new_parse =JSON.parse(data); }

catch(error1) {

return arg(error1); }

return arg(null, new_parse);

}); }

function loadJSON(file_name, arg){

fs.readFile(file_name, function(error1, data){

if(error1){

try{

arg(null, JSON.parse(data));

}

catch(error1) {

arg(file_name);

} }

}); }

Answer

Correct Answer:

var file1 = require('fs');

function loadJSON(file_name, arg){

file1.readFile(file_name, function(error1, data){

if(error1)return arg(error1);

try{

var new_parse =JSON.parse(data); }

catch(error1) {

return arg(error1); }

return arg(null, new_parse);

}); }

Note: This Question is unanswered, help us to find answer for this one

93.
What output will be generated when the following statements are executed in Node.js?
var x = H;
console.log(x);
x.value = 55;
console.log(x);

[55]

[]

[value: 55]

Answer

Correct Answer:

[]

[value: 55]

Note: This Question is unanswered, help us to find answer for this one

94.
What will be the output of the following Node.js program?
function first (value1, value2){
console.log("First Process");
setTimeout(value2, 1000, value1);
}
function second (value1, value2){
console.log("Second Process");
setTimeout( value2, 1000, value1); }
function third (value1, value2){
console.log("Third Process");
setTimeout( value2, 1000, value1); }
function handleThird(data3){
console.log("Complete:", data3); }
function handleSecond(data2) {
third(data2, handleThird); }
function handleFirst(data1) {
third(data1, handleSecond); }
first("Process", handleThird);

First Process

Third Process

Complete: Process

First Process

Complete: Process

Third Process

Complete: Process

Second Process

Complete: Process

Second Process

Third Process

Complete: Process

Answer

Correct Answer:

First Process

Complete: Process

Note: This Question is unanswered, help us to find answer for this one

95. Which of the following is the correct purpose of using the "exports" keyword in Node.js?

It is used for exporting data from one function to other.

It is used for exporting the modules.

It is used for exposing functions of one module to other modules.

It is used for exporting files from one application to other.

Answer

Correct Answer: It is used for exposing functions of one module to other modules.

Note: This Question is unanswered, help us to find answer for this one

96.
Which of the following is the correct program code that repeatedly calls a function after every two seconds for continuous eight seconds. and after that clears the interval with the message "Loop ends" and exits the application?

var obj1 =setlnterval(function(2000) {

var count = 0;

count++;

console.log(count, '2 seconds has passed');

if(count = 4) [

console.log('Loop ends');

clearlnterval(obj1); ]

I);

var obj1 =setlnterval(functlon() [

var count = 0;

count++;

console.log(count, '2 seconds has passed');

if(count = 4) [

console.log(‘Loop ends');

clearlnterval(obj1); ]

},2000);

var count = 0;

var obj1 =setlnterval(function(){

count++;

console.log(count, '2 seconds has passed‘);

if(count = 4) [

console.log('Loop ends');

clearlnterval(obj1); ]

},2000);

var count = 0;

var obj1 =(function.setlnterval0[

count-H;

console.log(count, '2 seconds has passed');

if(count = 4) [

console.log('Loop ends');

clearlnterval(obj1); ], 2000

I);

Answer

Correct Answer:

var count = 0;

var obj1 =setlnterval(function(){

count++;

console.log(count, '2 seconds has passed‘);

if(count = 4) [

console.log('Loop ends');

clearlnterval(obj1); ]

},2000);

Note: This Question is unanswered, help us to find answer for this one

97. Which of the following is the correct command that is used to check the installed version of Node.js on Windows operating system using the C command prompt?

node.js.version

version-node

node_version

node --version

Answer

Correct Answer: node --version

Note: This Question is unanswered, help us to find answer for this one

98.
The following function belongs to which of the given http.Server events in Node.js:
function (request, socket, head){}

checkContinue

connection

upgrade

clientError

Answer

Correct Answer:

upgrade

Note: This Question is unanswered, help us to find answer for this one

99.
Which of the following are the advantages of node_module?

a) It increases reusability.
b) It simplifies : ies the long f‌ile relative paths.
c) It helps in overcoming module incompatibility.
d) It is very helpful in changing of URLs without updating the middleware.
e) It allows to check the class of a particular object instance.

Only b and c

Only a and d

Only a, c, and d

Only a, b, and c

Only b, d, and e

Answer

Correct Answer:

Only a, b, and c

Note: This Question is unanswered, help us to find answer for this one

100. If you generate a private key named "key.pem", then which of the following commands will be used to generate a corresponding public key?

openssl req ~x509 -new -key key.pem > cert.pem

openssl genrsa 1024 > key.mykey

openssl req -x509 -new -cert.pem-> key.pem

openssl req -new >cert.pem

openssl req 4024 -new -key key.cert > cert.pem

Answer

Correct Answer: openssl req ~x509 -new -key key.pem > cert.pem

Note: This Question is unanswered, help us to find answer for this one

101. Which of the following is the correct command for installing the NPM module, underscore?

node npm underscore install

npm underscore install

install npm underscore

npm install underscore

Answer

Correct Answer: npm install underscore

Note: This Question is unanswered, help us to find answer for this one

102.
Which of the given statements is correct about the following program?
function mSync (ar1, ar2) {
if (ar1){
ar2("Data Cached") }
else {
setTimeout(function () {
ar2("Data Loaded ")
}, 2000);
} }
mSync(true, function (value) {
prg1();
});
prg2();
function prg2(){console.log("Good Morning")}
function prg1(){console.log("Good Evening")}

It will immediately display the following output:

Good Evening

Good Morning

It will display

It will immediately display the following output:

Good Morning

Good Evening

It will immediately display the following output

Data Cached

Good Evening

Data Loaded

Good Morning

No output will be displayed due to an error in the program.

Answer

Correct Answer:

It will immediately display the following output:

Good Evening

Good Morning

Note: This Question is unanswered, help us to find answer for this one

103. What is the default port number on which a node process in debug mode listens for accepting the incoming connections for the purpose of debugging?

3000

5858

8080

3333

Answer

Correct Answer: 5858

Note: This Question is unanswered, help us to find answer for this one

104.
Carefully study the following code snippet and answer the question that follows:
var http = require('http');
var server = http.createServer(function (request1, result1) {
console.log('This is request Header');
console.log(request1.headers);
result1.write('Working with HTTP');
result1.end();
}).listen(3000);
console.log('This is a sample');
When a client request is made, which of the following outputs is obtained on a web browser?

Working with HTTP

This is request Header

This is a sample

This is request Header

Working with HTTP

This is a sample

No output is displayed due to an error in the program.

Answer

Correct Answer:

Working with HTTP

Note: This Question is unanswered, help us to find answer for this one

105.
Which of the following HTTP methods for collection URLs is used to replace the entire collection with a new collection?

GET

PARAM

ALL

PUT

POST

Answer

Correct Answer:

PUT

Note: This Question is unanswered, help us to find answer for this one

106.
Study the following code snippet and determine which code line contains an error.
1. var connect =require('connect'),
2. http = require('http');
3. var app = connect();
4. http.createServer(http).listen(3000);
5. console.log('port 3000');

Line 1

Line 2

Line 3

Line 4

Line 5

Answer

Correct Answer:

Line 4

Note: This Question is unanswered, help us to find answer for this one

107.
The HTML code given in the image, when executed, should create a button and hovering over this button should display ‘New Button'. Which of the following code snippets should replace '??' in the given code to obtain the desired result?

$(function0[

button.tooltip(); D;

$(function0{

$('button').tooltip0: J):

(function(

$('button').tooltip() );

$(function( [ $(‘button').tooltip0; }));

Answer

Correct Answer:

$(function0{

$('button').tooltip0: J):

Note: This Question is unanswered, help us to find answer for this one

108.
What will be the output of the following code snippet?
var myVar = 'First Value';
if (true) {
(function () {
var myVar ='Second Value'
})();
}
console.log(myVar);

First Value

Second Value

First Value

Second Value

Program compiles successfully but nothing is displayed as output.

No output will be displayed due to an error in the program.

Answer

Correct Answer:

First Value

Note: This Question is unanswered, help us to find answer for this one

109. If you create a collection by using the createCollection method with [safe : true] option, then which of the following types of behaviors will be observed?

It will open an existing collection. If a collection does not exist. then it will return an error.

It will create a new collection if it does not exist. But ifa collection already exists. then it will return an error.

It will create a new collection if it does not exist, otherwise it will return an existing collection.

It will create a new collection if it does not exist. If a collection already exists, then it will create a duplicate collection.

Answer

Correct Answer: It will create a new collection if it does not exist. But ifa collection already exists. then it will return an error.

Note: This Question is unanswered, help us to find answer for this one

110. What is the purpose of using URL hashes in Node.js?

URL hashes are used to call a function that is present in one page of a web application to another page of the same web application.

URL hashes are used to link two different web applications.

URL hashes are used to denote that different content is being displayed in a web application that consists of a single page.

URL hashes are used to combine two or more web pages in a single page in a web application.

Answer

Correct Answer: URL hashes are used to denote that different content is being displayed in a web application that consists of a single page.

Note: This Question is unanswered, help us to find answer for this one

111.
The following code snippet when executed, should create a web server that serves the web page 'idx.html' from 'testing5' folder. However, the syntax of lines 3 and 4 are not correct. Select the correct replacements of lines 3 and 4 from the given answer options.
1. var exp = require ('express');
2. var serveStatic = require ('serve-static');
3. var app = express()
4. .use(serveStatic(dirname /testing5, {'index': ['idx.html']}))
5. .listen(3000);

var app = exp()[

use(serveStatic(_dirname ltestingS,{'index': ['idx.html']]))

var app = expo

.use(serveStatic(_dirname +‘/testing5'.{'index': ['idx.html']]))

var app = express();

.use(serveStatic('_dirname _testingS,{index: ['idx.html']]))

var app = express()

.use(serveStatic(ldirna me +'/testing5'.{index: ['idx.html‘]]))

var app = expo

.use(serveStatic(_dirname /testing5, {'index': ['idx.html']}))

Answer

Correct Answer:

var app = expo

.use(serveStatic(_dirname +‘/testing5'.{'index': ['idx.html']]))

Note: This Question is unanswered, help us to find answer for this one

112.
What output will be generated on the execution of the following lines of code?
var path = require('path');
console.log(path.join('test1'. 'ltest2'. 'test3'));

test1\test2\test3

test1\test2test3

test1/test2test3

test1test2test3

Answer

Correct Answer:

test1\test2\test3

Note: This Question is unanswered, help us to find answer for this one

113.
A module 'rimraf' is installed locally in a Node.js project.
The following code snippet is supposed to delete a directory named testing2 from the same project however the code contains some errors identify which code lines contain an error.
1.var rim1 = require('rimraf');
2.rimraf('./Testing2', function(error1)){
3. if(error1) console.log('This is an error', error1);
4. else console.log('Directory deleted successfully');
5.}

Lines1 and 3

Lines 3 and 5

Lines 2 and 5

Lines 2 and 3

Lines1 and 2

Answer

Correct Answer:

Lines 2 and 5

Note: This Question is unanswered, help us to find answer for this one

114.
Carefully study the following code snippet and answer the question that follows.
var exp = require('express');
var application1 = exp() .use(function (rq, rs){
console.log('Cookie Header:\n', rq.headers['cookie']);
rs.cookie('\n name', 'Node.js');
rs.end('Hello Express World');
}).listen(3000);
Which of the following code snippets should be added at the top of those files that use the mongodb module?

Hello Express World

Cookie Header:

No output will be displayed on the server console.

Name=Node.js

Answer

Correct Answer:

Cookie Header:

Note: This Question is unanswered, help us to find answer for this one

115.
Which of the following code snippets should be added at the top of those files that use the mongodb module?

Var Db = require('Db').

Connection = require('Connection'),

Server = require('Server);

Var Db = require('mongodb‘),

Connection = require('mongodb'),

Server = require('mongodb').listen(3000);

Var Db = require('Db').mongodb,

Connection = require('Connection').mongodb.

Server = require('Server').mongodb;

Var Db = require('mongodb‘).Db,

Connection = require('mongodb').Connection.

Server = require('m0ngodb').Server;

Answer

Correct Answer:

Var Db = require('mongodb‘).Db,

Connection = require('mongodb').Connection.

Server = require('m0ngodb').Server;

Note: This Question is unanswered, help us to find answer for this one

116.
The following code snippet should provide the output '[125, 450, 80]'. However, line 3 contains an error. What should be the correct syntax of line 3?

1)var m1 =[5.10. 35,125,450. 80. 40];
2)var _ = require(’underscore');
3)var output = _(m1. function (vall) 4)[
5) return val1 >50
6)}):
7)console.log(output);

var output = _.f‌iIter(m1, function (val1)[

var output = filter._(m1, function (val1)[

var output = filter(m1, function (val1)[

var output = _(f‌ilterfm1, function (val1)){

Answer

Correct Answer:

var output = _.f‌iIter(m1, function (val1)[

Note: This Question is unanswered, help us to find answer for this one

117.
Which of the following methods is used for setting a signed cookie?
Note: Consider the function inside which the method setting is performed as: function (r, s).

s.setCookie(name, value, [signedztrueD

s.cookie(name, value, [signed:true})

s.setCookie(r, name, value, {signed:true})

s.cookie(r, name, value, [signed:true])

Answer

Correct Answer:

s.cookie(name, value, [signed:true})

Note: This Question is unanswered, help us to find answer for this one

118. Which of the following is the correct function of the ng-repeat directive?

It takes the DOM element it is def‌ined on and duplicates it for every element in the ViewModel List.

It replicates the occurrences of a script element within different functions.

It takes the function it is def‌ined on and duplicates it for every element in the ViewModel list.

It replicates the occurrences of a controller within different functions.

Answer

Correct Answer: It takes the DOM element it is def‌ined on and duplicates it for every element in the ViewModel List.

Note: This Question is unanswered, help us to find answer for this one

119. Which of the following commands in the Node debugger helps user to step out of the current executing function?

step

backtrace

out

Answer

Correct Answer: out

Note: This Question is unanswered, help us to find answer for this one

120. Which of the following commands is used to get out of an undesirable ellipsis: a situation in which three dots [...] are repeatedly displayed?

_break

break

break.loop

end

end.loop

Answer

Correct Answer: break

Note: This Question is unanswered, help us to find answer for this one

121.
In Node.js. which of the following modules use(s) the 'require' function?
1) Core module
2) File module
3) External node_modules

Only 2

Only1 and 2

Only1 and 3

Only 2 and 3

All 1, 2, and 3

Answer

Correct Answer:

All 1, 2, and 3

Note: This Question is unanswered, help us to find answer for this one

122. Which of the following testing assertions uses the operator === for testing equality?

deepEqual(fvalue, expected)

strictEqual(value, expected)

ok(value)

throws(code, [error])

Answer

Correct Answer: strictEqual(value, expected)

Note: This Question is unanswered, help us to find answer for this one

123. Which of the following is not a part of the AAA pattern followed by good tests in chai library?

Assert

Act

Allow

Arrange

Answer

Correct Answer: Allow

Note: This Question is unanswered, help us to find answer for this one

124.
What will be the output of the following code snippet in Node.js?
var inherits = require(function Parent(){
this.message ='Example ';
}
Parent.PrototyPe.exP = function(){ return this.message + 'parent class ' };
function Child(){Parent.call(this);
} inherits(Child, Parent);
Child.prototype.exp = function () { return Parent.prototype.exp.call(this) + 'child class';
}
var chd = new Child();
console.log(chd.exp());

Example

parent class child class

parent class

Example parent class child class

Example child class

No output will be displayed due to an error in the program.

Answer

Correct Answer:

Example parent class child class

Note: This Question is unanswered, help us to find answer for this one

125. Which of the following functions is used to create an HTTPS server? (Consider the two parameters of the function as rq and rs, respectively.)

https_create$erver(options(rq. rs){}).listen(3000);

https.createServer(functionfrq. rs)[}).listen(3000);

https.createServer(options. function(rq. rs){]).listen(3000);

https.createServerfhttps. options. function(rq. rs)[]).listen(3000);

https.createServer(function(options. rq. rs){]).listen(3000);

Answer

Correct Answer: https.createServer(options. function(rq. rs){]).listen(3000);

Note: This Question is unanswered, help us to find answer for this one

126. In Node.js, which of the following keywords is used to load a module?

listen

load

require

log

res

Answer

Correct Answer: require

Note: This Question is unanswered, help us to find answer for this one

127. In Angular.js, which of the following acts as a link between the view and the model and is passed to the controller?

ng-controller

rig-app

guideService

$scope

Answer

Correct Answer: $scope

Note: This Question is unanswered, help us to find answer for this one

128.
Choose True or False:
Angular.js uses two-way data-binding for attaining synchronization between the view and the model.

True

False

Answer

Correct Answer:

True

Note: This Question is unanswered, help us to find answer for this one

129.
What will be the correct output of the following function?
process.nextTick(function(){
console.log('Example')}); console.log('Hello'); console.log('World');

Example

Hello

World

Hello

World

Example

Hello

World

Example

The program will throw an error.

Answer

Correct Answer:

Hello

World

Example

Note: This Question is unanswered, help us to find answer for this one

130.
Which of the following is a valid JSON object in Node.js?

{

phoneinfo :

{type: home, number : 123456},

{type : mobile, number : 8888888},

}

{

phoneinfo : {

{type = home, number = 123456},

{type = mobile, number = 8888888}

}}

{

phoneinfo : [

{ type : home, number : 123456},

{type : mobile, number : 8888888}

]}

{

phoneinfo : {

type : home, number : 123456,

type : mobile, number : 8888888

}}

Answer

Correct Answer:

phoneinfo : [

{ type : home, number : 123456},

{type : mobile, number : 8888888}

]}

{

Note: This Question is unanswered, help us to find answer for this one

131.
However, lines 11 and 13 contain errors. Which of the following is the correct syntax of line 11 and line 13?

Line 11 :Animal_Example.call(this);

Line 13 : Bird_Example.prototype.proto = Animal_Example.prototype;

Line 11 :Animal_Example.call(this. name);

Line 13 : Bird_Example.prototypeproto = AnimaI_Example(prototype);

Line 11 :Animal_Example.call(this(name));

Line 13 : Bird_Example.protolype.proto_ = Animal_Example(prototype);

Line 11 :Animal_Example.call(this. name);

Line 13 : Bird_Example.prototype._proto_ = Animal_Example.prototype;

Line 11 :Animal_Example.call(this(name)); Line 13 : Bird_Example._proto_.prototype = Animal_Example.prototype;

Answer

Correct Answer:

Line 11 :Animal_Example.call(this. name);

Line 13 : Bird_Example.prototype._proto_ = Animal_Example.prototype;

Note: This Question is unanswered, help us to find answer for this one

132.
The program given in the image should provide the following output:

Fox is walking toward point A

Pigeon is walking toward point B

Pigeon is flying toward point C

Answer

Correct Answer:

Pigeon is walking toward point B

Note: This Question is unanswered, help us to find answer for this one

133. Which of the following is the most popular package manager for Node?

Node

NPM

None of above

Answer

Correct Answer: NPM

Note: This Question is unanswered, help us to find answer for this one

134.
How to fire event using EventEmitter: var events = new events.EventEmitter();

events.fireEvent(‘eventName');

events.send('eventName');

events.fire('eventName');

events.emit('eventName');

Answer

Correct Answer: events.emit('eventName');

Note: This Question is unanswered, help us to find answer for this one

135.
Which of the following code can make a request to a web server?

http.request(options, callback)

http.createRequest(options, callback)

http.makeRequest(options, callback)

None of the above.

Answer

Correct Answer: http.request(options, callback)

Note: This Question is unanswered, help us to find answer for this one

136.
For Linux, which of the following environment variables is needed to set for successful NodeJS installation?

export PATH=$PATH:/usr/local/nodejs/bin

export NODE=$PATH:/usr/local/nodejs/bin

None of above

Answer

Correct Answer: export PATH=$PATH:/usr/local/nodejs/bin

Note: This Question is unanswered, help us to find answer for this one

137.
Which are the following debug commands to debug node server?

node debug

npm debug

node debug -p

node debug

All of the above

Answer

Correct Answer: node debug
node debug -p
node debug

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

138.
What output will this code produce in the console? const EventEmitter = require('events');
const myEmit = new EventEmitter();
myEmit.on('slick', () => {});
myEmit.on('key', () => {});
const symbol = Symbol('init');
myEmit.on(symbol, () => {});
console.log(myEmit.eventNames());

[ 'slick', 'key', (init) ]

[ 'slick', 'key', Symbol ]

{ 'slick', 'key', init }

[ 'slick', 'key', Symbol(init) ]

[Symbol(init) ]

Answer

Correct Answer: [ 'slick', 'key', Symbol(init) ]

Note: This Question is unanswered, help us to find answer for this one

139.
Which of the following code converts a buffer buf to JSON object?

buf.toJSON()

buf.json()

buf.covertToJson()

buf.jsonify()

Answer

Correct Answer: buf.toJSON()

Note: This Question is unanswered, help us to find answer for this one

140.
What is the output when the following code is executed? var http = require("http"); var server = http.createServer(function(req, res) { res.writeHead(200, {"Content-Type": "text/html"}); res.end(` HTML Render Response

Testing Response!

${req.url}

${req.method}

`); }); server.listen(3000); console.log("Server listening on port 3000");

Testing Response! / PUT

Testing Response! Current URL Display POST

Testing Response! / GET

Server listening on port 3000

Answer

Correct Answer: Server listening on port 3000

Note: This Question is unanswered, help us to find answer for this one

141.
What is the output in console of this code?
var events = require('events');
var myEventEmitter = new events.EventEmitter();
myEventEmitter.once('a', function () {
console.log('a')});
myEventEmitter.on('b', function () {
console.log('b')});
myEventEmitter.emit('a');
myEventEmitter.emit('b');
myEventEmitter.emit('a');
myEventEmitter.emit('b');

a b a b

a b b

a b a

b a b a

Answer

Correct Answer: a b b

Note: This Question is unanswered, help us to find answer for this one

142.
How can you access the command line arguments passed to your program?

process.argv

process.args

process.node.arg

process.env.args

Answer

Correct Answer: process.argv

Note: This Question is unanswered, help us to find answer for this one

143.
Select valid stream instances:

stream.Transform

stream.Duplex

stream.Write

stream.Read

All are valid

Answer

Correct Answer: stream.Transform
stream.Duplex
stream.Write
stream.Read

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

144.
How to convert from Buffer instance to string of base64?

Base64.encode(myBuffer);

myBuffer.encode(“base64”);

encode(myBuffer,”base64”);

myBuffer.toString(“base64”);

Answer

Correct Answer: myBuffer.toString(“base64”);

Note: This Question is unanswered, help us to find answer for this one

145.
Which method of fs module is used to truncate a file?

fs.delete(fd, len, callback)

fs.remove(fd, len, callback)

fs.ftruncate(fd, len, callback)

None of the above.

Answer

Correct Answer: fs.ftruncate(fd, len, callback)

Note: This Question is unanswered, help us to find answer for this one

146.
What does the following line of code do? var http = require("http");

Uses the require directive to load the http module

Stores the returned HTTP instance into an http variable

Both of the above

None of the above

Answer

Correct Answer: Both of the above

Note: This Question is unanswered, help us to find answer for this one

147.
Which of the following is true about writable stream?

writable stream is used for write operation.

Output of readable stream can be input to a writable stream.

Both of the above.

None of the above.

Answer

Correct Answer: Both of the above.

Note: This Question is unanswered, help us to find answer for this one

148.
Which code will return total system memory in bytes? os is included like this: const os = require('os');

os.totalmem()

os.totalmem

os.getTotalMemory()

None of the above

Answer

Correct Answer: os.totalmem()

Note: This Question is unanswered, help us to find answer for this one

149.
What is the syntax to list all commands in REPL?

help

.help

??help

None of the above

Answer

Correct Answer: .help

Note: This Question is unanswered, help us to find answer for this one

150.
REPL stands for :

Read Evaluate Print Loop

Read Eval Process Loop

Read Eval Print Loop

None of the above

Answer

Correct Answer: Read Eval Print Loop

Note: This Question is unanswered, help us to find answer for this one

151.
What is Callback?

Callback is an asynchronous equivalent for a function.

Callback is a technique in which a method call back the caller method.

Both of the above.

None of the above.

Answer

Correct Answer: Callback is an asynchronous equivalent for a function.

Note: This Question is unanswered, help us to find answer for this one

152.
Which of the following methods alone will write a file in Node.js? (check all that apply)

fs.write()

fs.writeFile()

fs.createWriteStream()

fs.writeStream()

Answer

Correct Answer: fs.write()
fs.writeFile()

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

153.
Which of the following methods can be used to read the filenames of a directory?

fs.readdir()

fs.readdirSync()

fs.readDirectory()

fs.readdirAsync()

Answer

Correct Answer: fs.readdir()
fs.readdirSync()

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

154.
Which function will delete a file?

fs.unlink(path,callback);

fs.remove(path,callback);

fs.delete(path,callback);

fs.rm(path,callback);

Answer

Correct Answer: fs.unlink(path,callback);

Note: This Question is unanswered, help us to find answer for this one

155.
Which of the following method resolves an ip address to an array of hostnames?

dns.reverse(ip, callback)

dns.resolve(hostname[, rrtype], callback)

dns.resolve4(hostname, callback)

None of the above.

Answer

Correct Answer: dns.reverse(ip, callback)

Note: This Question is unanswered, help us to find answer for this one

156.
Which of the following is true about Node.JS?

Node.js is a JavaScript based framework/platform built on Google Chrome's JavaScript V8 Engine.

Node.JS is used to delevop I/O intensive web applications like video streaming sites, single page applications and other web application.

Node.js is open source and is completely free to use.

All of the above.

Answer

Correct Answer: All of the above.

Note: This Question is unanswered, help us to find answer for this one

157.
Which of the following is correct way to imports http module?

require('http')

import http;

include http;

module http;

Answer

Correct Answer: require('http')

Note: This Question is unanswered, help us to find answer for this one

158.
How to add a listener to event emitter?

eventEmitter.on(‘event',connectHandler);

eventEmitter.at(‘ev',connectHandler);

eventEmitter.receive(‘eventHandler’,connectHandler);

eventEmitter.bind(‘e',connectHandler);

Answer

Correct Answer: eventEmitter.on(‘event',connectHandler);

Note: This Question is unanswered, help us to find answer for this one

159.
Which of the following NPM commands will install both dependencies and devDependencies of a given project?

npm install

npm install --dev

npm install --production

None of these

depends on NODE_ENV environment variable

Answer

Correct Answer: depends on NODE_ENV environment variable

Note: This Question is unanswered, help us to find answer for this one

160.
In which of the following areas, Node.js is not advised to be used?

Single Page Applications

JSON APIs based Applications

CPU intensive applications

Data Intensive Realtime Applications (DIRT)

Answer

Correct Answer: CPU intensive applications

Note: This Question is unanswered, help us to find answer for this one

161.
How can the output of one stream be provided as input to another stream?

stream1.pipe(stream2);

stream1.chain(stream2);

stream1.set(stream2);

stream1.createStream(stream2);

Answer

Correct Answer: stream1.pipe(stream2);

Note: This Question is unanswered, help us to find answer for this one

162.
Which of the following code prints current directory?

console.log('Current directory: ' + process.cwd());

console.log('Current directory: ' + console.cwd());

console.log('Current directory: ' + process.currenWorkingDirectory());

None of the above.

Answer

Correct Answer: console.log('Current directory: ' + process.cwd());

Note: This Question is unanswered, help us to find answer for this one

163.
Which of the following can be used to access the environment variable?

process.env

process.argv

process.env.var

process.environment

Answer

Correct Answer: process.env

Note: This Question is unanswered, help us to find answer for this one

164.
The NODE_DEBUG environment variable specifically turns logs for the following core functionality?

net

asynce

tls

http -WRONG ANS

Answer

Correct Answer: fs

Note: This Question is unanswered, help us to find answer for this one

165.
Which of the following methods will write "text" without a trailing new line?

process.stdout.print('text')

console.error('text')

console.log('text')

process.stdout.write('text')

Answer

Correct Answer: process.stdout.write('text')

Note: This Question is unanswered, help us to find answer for this one

166.

Which of the following frameworks is most popular Node.js framework?

Koa

Express

Hapi

Total.js

Answer

Correct Answer: Express

Note: This Question is unanswered, help us to find answer for this one

167.

Which command will show all the modules installed locally?

$ npm ls -g

node ls -g

npm ls

node ls

Answer

Correct Answer: npm ls

Note: This Question is unanswered, help us to find answer for this one

168.

Which of the following utility modules are available in NodeJS?

path

net

DNS

All of above

Answer

Correct Answer: All of above

Note: This Question is unanswered, help us to find answer for this one

169.

Which of the following methods is used to check modifications in files?

watch

watchDir

watchFilesList

All of these

Answer

Correct Answer: watch

Note: This Question is unanswered, help us to find answer for this one

170.
How to Terminate Node REPL using the following short key?

ctrl + c

ctrl + c twice

ctrl + d

Answer

Correct Answer: ctrl + c twice

Note: This Question is unanswered, help us to find answer for this one

171.
Which of the following is not a HTTP method?

A. put

B. get

C. post

D. header

E. All of the above

Answer

Correct Answer: D. header

Note: This Question is unanswered, help us to find answer for this one

172.
Which of the following statement is valid?

A. Node implements File I/O using simple wrappers around standard POSIX functions.

B. Node File System (fs) module should be imported for File I/O opearations.

C. Both of the above

D. None of the above

Answer

Correct Answer: C. Both of the above

Note: This Question is unanswered, help us to find answer for this one

173.
Which of the following code is valid to get a joint path?

A. path.join('/test0', 'test11', '2slashes/1slash', 'tab', '..')

B. path.combine('/test0', 'test11', '2slashes/1slash', 'tab', '..')

C. buffer.join('/test0', 'test11', '2slashes/1slash', 'tab', '..')

D. None of the above

Answer

Correct Answer: A. path.join('/test0', 'test11', '2slashes/1slash', 'tab', '..')

Note: This Question is unanswered, help us to find answer for this one

174.
Which of the following is operates asynchronous logic?

Callbacks

Loops

Event Emitters

All of the above

Answer

Correct Answer: Callbacks
Event Emitters

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

175.
In express application you are handling the route '/user/:name'. How could you access the 'name' property?

req.params.name

req.prop.name

req.query.name

req.path.name

Answer

Correct Answer: req.params.name

Note: This Question is unanswered, help us to find answer for this one

176.
Which of the following should not to use in NodeJS?

I/O bound Applications

CPU Intensive Applications

Data Streaming Applications

Data Intensive Real-time Applications

Answer

Correct Answer: CPU Intensive Applications

Note: This Question is unanswered, help us to find answer for this one

177.
Which of the following is the result of module.id ?

file name

3-byte machine identifier

2-byte process id

3-byte process id

Answer

Correct Answer: file name

Note: This Question is unanswered, help us to find answer for this one

178.
Which of the following timers methods exists in Node.js?

setSleep

clearTimout

sleep

setTimeout

Answer

Correct Answer: clearTimout
setTimeout

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

179.
Which of the following variables you can use in modules?

__filename

__directory

__dirname

__filesize

Answer

Correct Answer: __filename
__dirname

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

180.
Which of the following classes is the parent for repl.REPLServer class?

REPL.Interface

readline.Interfase

REPL

REPLSERVER

Answer

Correct Answer: readline.Interfase

Note: This Question is unanswered, help us to find answer for this one

181.
Which of the libs are exists in Node Core Libraries?

.Net on the link it is mentioned as NET but here is .NET not I am not sure.

HTTP

STDLIB

Path

Answer

Correct Answer: HTTP
Path

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

182.
Which of the following code print the name of operating system?

console.log('type : ' + os.type);

console.log('type : ' + os.getType());

console.log('type : ' + os.type());

None of the above

Answer

Correct Answer: console.log('type : ' + os.type());

Note: This Question is unanswered, help us to find answer for this one

183.
Which are the below NodeJS features?

Very Fast

No Buffering

Single Threaded but Highly Scalable

Asynchronous and Event Driven

None of above

Answer

Correct Answer: Very Fast
No Buffering
Single Threaded but Highly Scalable
Asynchronous and Event Driven

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

184.
Which of the following engine built of NodeJS framework/platform?

Firefox's JavaScript V8 Engine

Google Chrome's JavaScript V8 Engine

None of above

Answer

Correct Answer: Google Chrome's JavaScript V8 Engine

Note: This Question is unanswered, help us to find answer for this one

185.
Which of the following module require to create server for NodeJS?

http

server

https

Answer

Correct Answer: http

Note: This Question is unanswered, help us to find answer for this one

186.
Which of the following values is correct about how many lines defaults can be in NODE_REPL_HISTORY_SIZE?

1000

1024

2000

2048

Answer

Correct Answer: 1000

Note: This Question is unanswered, help us to find answer for this one

187.
Which of the following commands exit from REPL?

ctrl+X

ESC

double ctrl+c

ctrl+c

Answer

Correct Answer: double ctrl+c

Note: This Question is unanswered, help us to find answer for this one

188.
Which of the following libs provides basic HTTP authentication for protecting data?

auth-base

basicAuth

connect

http

Answer

Correct Answer: connect

Note: This Question is unanswered, help us to find answer for this one

189.
Which of the following libs is using for debugging node-applications?

npm-debug

node-debugger

node-inspector

debugger

Answer

Correct Answer: node-inspector

Note: This Question is unanswered, help us to find answer for this one

190.
How would you start node with debugger?

node debug myscript.js

node myscript.js --debug

node myscript.js --debugger

node myscript.js debugger runs automatically with every execution

Answer

Correct Answer: node debug myscript.js

Note: This Question is unanswered, help us to find answer for this one

191.
Which of the following values can return async functions?

function

object

string

Non of these

Answer

Correct Answer: Non of these

Note: This Question is unanswered, help us to find answer for this one

192.
Which of the following statement is true about the fs module of Node?

Asynchronous methods of fs module take last parameter as completion function callback

Every method in fs module have synchronous as well as asynchronous form

Both of the above

None of the above

Answer

Correct Answer: Both of the above

Note: This Question is unanswered, help us to find answer for this one

193.
What REST stands for?

Representational State Transfer

Resource Efficient State Transfer

Real Elegant State Transfer

Resource Elegant State Transfer

Answer

Correct Answer: Representational State Transfer

Note: This Question is unanswered, help us to find answer for this one

194.
NodeJS includes a full-featured out-of-process debugging utility accessible via a which protocol?

TCP-based protocol

UDP-based protocol

All of the above

Answer

Correct Answer: TCP-based protocol

Note: This Question is unanswered, help us to find answer for this one

195.
Which of the following file extensions supports Node Module System ?

.js

.json

.node

All of these

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

196.
Route path: /train/from-:to Request URL: http://localhost:3000/train/AHM-BRD What should be request params?

{ "from": "AHM", "to": "BRD" }

{ "train": "AHM", "to": "BRD" }

{ "from": "AHM", "train": "BRD" }

None of the above

Answer

Correct Answer: { "from": "AHM", "to": "BRD" }

Note: This Question is unanswered, help us to find answer for this one

197.
Which of the following ways to create a child process?

exec() method

spawn() method

fork() method

All of the above

None of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

198.
Which of the following files using for setting start point in deployment services?

.travis.yml

PROCFILE

.CONFIG

.npm-start

Answer

Correct Answer: PROCFILE

Note: This Question is unanswered, help us to find answer for this one

199.
You are handling POST request to the server. Which express middleware gives access to the submitted form data?

bodyParser

formHandler

basicForms

postHandler

Answer

Correct Answer: bodyParser

Note: This Question is unanswered, help us to find answer for this one

200.
What is the use of Underscore variable in REPL session?

To store the result

To get the last command used

To get the last result

None of the above

Answer

Correct Answer: To get the last result

Note: This Question is unanswered, help us to find answer for this one

201.
Suppose we have this construction in Expres.js project,Which of the following paths will match this route? app.get('/kl+mn', function(req, res) { return res.send('kl+mn'); });

klmn

kllmn

kmcd

All of these.

Answer

Correct Answer: klmn
kllmn

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

202.
Which of the following flags working with npm?

-O

-P

-R

-S

Answer

Correct Answer: -O

Note: This Question is unanswered, help us to find answer for this one

203.
Which of the following command-line arguments to "npm install" will allow an NPM package's binaries to be run outside the project folder?

-g

--global

-l

--link

Answer

Correct Answer: -g
--global

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

204.
Which Node.js module can be used to get the IP address of the server the program is running on?

util

dns

net

Answer

Correct Answer: os

Note: This Question is unanswered, help us to find answer for this one

205.
What does the following code do?
var http = require('http');
var fs = require('fs');
var file = fs.createWriteStream("file.png");
var request = http.get("http://path/to/file.png",
function(response) { response.pipe(file); });

It creates an HTTP GET request and pipes its response into a writeable file stream.

It creates an HTTP GET request, and synchronously pipes its response into a writeable file stream.

It creates an HTTP POST request and pipes its response into a readable file stream.

It creates an HTTP POST request and pipes its response into a writeable file stream.

Answer

Correct Answer: It creates an HTTP GET request and pipes its response into a writeable file stream.

Note: This Question is unanswered, help us to find answer for this one

206.
Which of the following statements is true about the console Object in Node.js?

"console.log" can take only a single argument.

"console.log" prints to stdout without a newline.

Its functions are synchronous when the destination is a terminal or a file, and asynchronous when it's a pipe.

Its functions are asynchronous when the destination is a terminal or a file, and synchronous when it's a pipe.

Answer

Correct Answer: "console.log" can take only a single argument.

Note: This Question is unanswered, help us to find answer for this one

207.
Which of the following methods can be used to read the contents of a directory?

fs.readdir()

fs.readdirSync()

fs.readDirectory()

fs.readdirAsync()

Answer

Correct Answer: fs.readdir()

Note: This Question is unanswered, help us to find answer for this one

208.
Which of the following statements are true about the child_process module in Node.js?

It is not possible to stream data through a child process' stdin, stdout, and stderr in a fully non-blocking way.

Child processes always have two streams associated with them.

"require('child_process').spawn()" can be used to create a child process.

"require('child_process').fork()" can be used to create a child process.

Answer

Correct Answer: "require('child_process').spawn()" can be used to create a child process.
"require('child_process').fork()" can be used to create a child process.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

209.
Which of the following statements are true about the module.exports object in Node.js?

It is the object that gets returned from a require() call.

It can be assigned in a callback.

Assigning an export object to module.exports will rebind the local exports variable.

None of these.

Answer

Correct Answer: It is the object that gets returned from a require() call.
Assigning an export object to module.exports will rebind the local exports variable.

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

210.
Which of the following will open a file, then read its contents one line at a time?

fs.readFileStream()

fs.readFile()

fs.createReadStream()

s.createFileStream()

Answer

Correct Answer: fs.createReadStream()

Note: This Question is unanswered, help us to find answer for this one

211.
Which of the following will open a file, then read its contents one line at a time?

__filename

os.tmpdir()

path.dirname()

path.basename()

Answer

Correct Answer: __filename

Note: This Question is unanswered, help us to find answer for this one

212.
Which of the following will synchronously check if a file/directory exists?

fs.exists()

fs.existsSync()

fs.checkFileSync()

fs.checkDirSync()

Answer

Correct Answer: fs.existsSync()

Note: This Question is unanswered, help us to find answer for this one

213.
Which of the following console commands will update all installed global packages to the latest available versions?

npm upgrade -g

npm install -uga

npm update -g

npm version --install-latest

Answer

Correct Answer: npm update -g

Note: This Question is unanswered, help us to find answer for this one

214.
What does process.argv[1] contain?

node

The file path of the JavaScript file.

The first command line argument.

The second command line argument.

Answer

Correct Answer: The file path of the JavaScript file.

Note: This Question is unanswered, help us to find answer for this one

215.
What does the following command do? npm view <package-name> version

It shows the version of the package installed globally.

It shows the version of the package installed locally.

It shows the version of the package that is cached.

It shows the latest version of the package that is available.

Answer

Correct Answer: It shows the latest version of the package that is available.

Note: This Question is unanswered, help us to find answer for this one

216.
Which of the following will copy a file in Node.js?

var fs = require('fs'); fs.createReadStream('test.file').pipe(fs.createWriteStream('newFile.file'));

var fs = require('fs'); fs.createReadBuffer('test.file').pipe(fs.createWriteBuffer('newFile.file'));

var fs = require('file'); fs.createFileReader('test.file').pipe(fs.createFileWriter('newFile.file'));

var fs = require('fs'); fs.createReadBuffer('test.file').stream(fs.createWriteBuffer('newFile.file'));

Answer

Correct Answer: var fs = require('fs'); fs.createReadStream('test.file').pipe(fs.createWriteStream('newFile.file'));

Note: This Question is unanswered, help us to find answer for this one

217. Which node module is used to make API request?

request

post_request

get_request

Answer

Correct Answer: request

Note: This Question is unanswered, help us to find answer for this one

218. Which of these are valid ways to apply middleware in Express?

app.use( middleware );

app.all("*", middleware);

app.get("/route", middleware, routeHandler );

All of these.

Answer

Correct Answer: All of these.

Note: This Question is unanswered, help us to find answer for this one

219. Which is a correct way to check the latest released version of the Express module with npm?

npm express version

npm view express version

npm version express

npm show version express

Answer

Correct Answer: npm view express version

Note: This Question is unanswered, help us to find answer for this one

220. A Buffer can be resized.

Sometimes

False

True

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

221. Which of the following is NOT true about Node 0.6?

Unix binary distributed

Windows binary distributed

Native gzip support

Integrated master-worker support for load-balancing

Integrated command-line debugger

Answer

Correct Answer: Unix binary distributed

Note: This Question is unanswered, help us to find answer for this one

222. Which of these is not a valid version according to npm semantic versioning?

"1.2.3+build4"

"v1.2.3"

"1.2.3-rc4"

"1.2.3b"

Answer

Correct Answer: "1.2.3b"

Note: This Question is unanswered, help us to find answer for this one

223. What is the default request limit to the same origin on a node.js http client?

unlimited

Answer

Correct Answer: 5

Note: This Question is unanswered, help us to find answer for this one

224. What is the default memory limit on a node process?

512mb on 32-bit systems, and 1gb on 64-bit systems.

1gb on 32-bit systems, and 2gb on 64-bit systems.

No Limit

Answer

Correct Answer: 512mb on 32-bit systems, and 1gb on 64-bit systems.

Note: This Question is unanswered, help us to find answer for this one

225. Is it possible to execute node.js system command synchronously?

Yes, built in by default.

Yes, with a third party library

Answer

Correct Answer: Yes, with a third party library

Note: This Question is unanswered, help us to find answer for this one

226. How do you create a new client connection via SSL?

tls.connect()

ssl()

ssl.join()

ssl.connect()

Answer

Correct Answer: tls.connect()

Note: This Question is unanswered, help us to find answer for this one

227. When creating a command line tool with Node.js, which expresion will allow you access the first command line argument?

process.execArgv[0]

process.argv[0]

process.argv[2]

process.argv[1]

Answer

Correct Answer: process.argv[2]

Note: This Question is unanswered, help us to find answer for this one

228. In the following Express routing method, what is the maximum number of arguments that may be passed to the callback function "routeHandler"? app.all("*", routeHandler )

Answer

Correct Answer: 4

Note: This Question is unanswered, help us to find answer for this one

229. How do you properly timestamp a log message?

require('util').log('message')

console.log('message')

console.trace('message')

console.debug('message')

Answer

Correct Answer: require('util').log('message')

Note: This Question is unanswered, help us to find answer for this one

230. If the Connect node package module is updated from version 2.8.5 to version 3.1.0 which dependency in your package.json file may break your application on update?

"connect": "1.0.0"

"connect": "2.x"

"connect": ">=2.0.0 <2.8.5"

"connect": ">=2.5"

Answer

Correct Answer: "connect": ">=2.5"

Note: This Question is unanswered, help us to find answer for this one

231. Which express 3 middleware has _NOT_ been moved into its own module in express 4.

error-handler

static

session

logger

Answer

Correct Answer: static

Note: This Question is unanswered, help us to find answer for this one

232. Which of these is a valid way to output the contents of a file?

fs.readFileSync("file.txt", function(err,data){ console.log(data); });

console.log( fs.readFile("file.txt") );

console.log( fs.readFileSync("file.txt") );

Answer

Correct Answer: console.log( fs.readFileSync("file.txt") );

Note: This Question is unanswered, help us to find answer for this one

233. Which of these is NOT a global object?

Buffer

Stream

exports

process

console

Answer

Correct Answer: Stream

Note: This Question is unanswered, help us to find answer for this one

234. In Express, which of these would NOT expose the variable "title" to the template renderer?

res.render("template",{ title: "My App" });

res.locals.title = "My App";

app.locals({ title: "My App" });

res.render.title = "My App";

Answer

Correct Answer: res.render.title = "My App";

Note: This Question is unanswered, help us to find answer for this one

235. What would be the value after that the timeouts has been fired? var x = 0; function callback(err,result){ if (err) { x--; return; } x++; } setTimeout(callback,10); setTimeout(callback,10,"Error");

Answer

Correct Answer: 0

Note: This Question is unanswered, help us to find answer for this one

236. Which of the following is not a global object in node.js?

none, node.js doesn't have global objects

console

Buffer

process

path

Answer

Correct Answer: path

Note: This Question is unanswered, help us to find answer for this one

237. The http.ServerResponse is an example of a what?

A readable Stream.

A callback.

A pipe.

A writable Stream.

Answer

Correct Answer: A writable Stream.

Note: This Question is unanswered, help us to find answer for this one

238. Which Express middleware must come before express.session() in your stack?

express.cookieParser()

express.static()

express.sessionParser()

express.bodyParser()

Answer

Correct Answer: express.cookieParser()

Note: This Question is unanswered, help us to find answer for this one

239. Which of these are required fields in your package.json file?

"name", "version", and "dependancies"

"name"

"name" and "version"

"name", "version", and "description"

Answer

Correct Answer: "name" and "version"

Note: This Question is unanswered, help us to find answer for this one

240. To parse a URL string use____?

queryresolve

urlparse

urlstring

querystring

Answer

Correct Answer: querystring

Note: This Question is unanswered, help us to find answer for this one

241. The Javascript used in node.js:

Is a full ECMAScript 4 implementation

Is on-par with a recent version of WebKit

Is on-par with a recent version of IE

Is limited to ECMAScript 2 subset

Is on-par with a recent version of Chrome

Answer

Correct Answer: Is on-par with a recent version of Chrome

Note: This Question is unanswered, help us to find answer for this one

242. If an EventEmitter object emits an 'error' event and there is no listener for it, node will:

Print a stack trace and exit

Do nothing

Save a coredump file containing the error data

Print a stack trace and continue running

Answer

Correct Answer: Print a stack trace and exit

Note: This Question is unanswered, help us to find answer for this one

243. In Node.js, the result of an asynchronous function can be accessed how?

By the value passed as the second argument of the callback.

By the value returned by the callback.

By the value returned by the asynchronous function.

By the value passed as the first argument of the callback.

Answer

Correct Answer: By the value passed as the second argument of the callback.

Note: This Question is unanswered, help us to find answer for this one

244. What is NOT a valid method to create a child process instance?

None of these

spawn()

popen(3)

fork()

Answer

Correct Answer: popen(3)

Note: This Question is unanswered, help us to find answer for this one

245. Node.js clusters are child processes that do NOT share server ports?

false

true

Answer

Correct Answer: false

Note: This Question is unanswered, help us to find answer for this one

246. What command is used to end a Node.JS process?

leave

.exit

-q

quit

Answer

Correct Answer: .exit

Note: This Question is unanswered, help us to find answer for this one

247. Which of these is definitely true of Node.js?

Node.js is a very stable platform that is not likely to change in the future.

Node.js takes full advantage of multithreading.

Node.js can be used to create command line tools.

Node.js is a high-level application framework.

Answer

Correct Answer: Node.js can be used to create command line tools.

Note: This Question is unanswered, help us to find answer for this one

248. var http_server = require('http'); how can you create a server?

http.startServer(function(){});

http_server.startServer(function(){});

any of them

http.createServer(function(){});

http_server.createServer(function(){});

Answer

Correct Answer: http_server.createServer(function(){});

Note: This Question is unanswered, help us to find answer for this one

249. Is it possible to use jQuery on Node.js?

Yes, natively.

No, because Node.js isn't a browser.

Yes, with third party server-side DOM module.

Answer

Correct Answer: Yes, with third party server-side DOM module.

Note: This Question is unanswered, help us to find answer for this one

250. The process object is an instance of____?

EventCommand

EventEmitter

EventProcess

EventHandler

Answer

Correct Answer: EventEmitter

Note: This Question is unanswered, help us to find answer for this one

251. Given the following route and request, which Request object property will hold the value of 20 in the Express handler? Route: "/post/:id" Request: "/post/30?start=20"

req.prop.start

req.query.start

req.params.start

req.start

Answer

Correct Answer: req.query.start

Note: This Question is unanswered, help us to find answer for this one

252. Node.js is a truly parallel technology.

False

True

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

253. Which of the following statements are true about the module.exports object?

It's a global object

It is the object returned from a require() call

Can be assigned in a callback

It's an alias to the exports object

Answer

Correct Answer: It is the object returned from a require() call

Note: This Question is unanswered, help us to find answer for this one

254. True or false? Node.js is multi-core by nature.

False

True

Only if compiled properly

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

255. Node will run until its sure that no further ___ are available.

Events-handlers

Processes

Utils

Domains

Answer

Correct Answer: Events-handlers

Note: This Question is unanswered, help us to find answer for this one

256. The VM module allows one to:

Run alternative operating systems from within node

Run Java and .NET bytecode from within node

Manage the server's virtual memory

Run JavaScript code in a sandbox environment

Answer

Correct Answer: Run JavaScript code in a sandbox environment

Note: This Question is unanswered, help us to find answer for this one

257. Which of the following methods will print to the console without a trailing new line?

console.error

util.puts

process.stdout.write

console.log

Answer

Correct Answer: process.stdout.write

Note: This Question is unanswered, help us to find answer for this one

258. Express middleware is actually handled by what other Node.js module?

Mocha

Stack

Connect

Request

Answer

Correct Answer: Connect

Note: This Question is unanswered, help us to find answer for this one

259. The process object is an instance of what class?

EventEmitter

NodeProcesser

EventProcesser

NPM

Answer

Correct Answer: EventEmitter

Note: This Question is unanswered, help us to find answer for this one

260. Which of these Express middleware stacks will NOT log favicon requests?

app.use(express.favicon()); app.use(express.logger()); app.use(express.static(__dirname + '/public'));

app.use(express.static(__dirname + '/public')); app.use(express.logger()); app.use(express.favicon());

app.use(express.logger()); app.use(express.static(__dirname + '/public')); app.use(express.favicon());

Answer

Correct Answer: app.use(express.favicon()); app.use(express.logger()); app.use(express.static(__dirname + '/public'));

Note: This Question is unanswered, help us to find answer for this one

261. By executing node without any arguments from the command-line:

you will be dropped into the REPL

you will receive an error message

node will ask you for arguments

nothing happens, node needs a file name argument such as "app.js" in order to start

Answer

Correct Answer: you will be dropped into the REPL

Note: This Question is unanswered, help us to find answer for this one

262. What built in class is a global type for dealing with binary data directly?

Buffer

Cluster

Process

Answer

Correct Answer: Buffer

Note: This Question is unanswered, help us to find answer for this one

263. Given the following route and request, which Request object property will hold the value of 30 in the Express handler? Route: "/post/:id" Request: "/post/30?start=20"

req.id

req.query.id

req.params.id

req.params.post

Answer

Correct Answer: req.params.id

Note: This Question is unanswered, help us to find answer for this one

264. The first argument passed to a Node.js asynchronous callback is always what?

The result of the function if there is one.

A javascript promise.

An Error object if an error has occured.

None of these.

Answer

Correct Answer: An Error object if an error has occured.

Note: This Question is unanswered, help us to find answer for this one

265. Which company manages and maintains node.js?

Google

Joyent

Notch

FreeNode

Answer

Correct Answer: Joyent

Note: This Question is unanswered, help us to find answer for this one

266. To create an instance of the HTTP object, which function is used?

create

order

require

suggest

Answer

Correct Answer: require

Note: This Question is unanswered, help us to find answer for this one

267. What do the lines like symbols = symbols || SYMBOLS_DEFAULT; do?

This is a JS idiom for overriding user inputted arguments.

This is a JS idiom for checking that arguments are within a valid range.

This is a JS idiom for setting default arguments.

This is a JS idiom for setting symbols to undefined.

Answer

Correct Answer: This is a JS idiom for setting default arguments.

Note: This Question is unanswered, help us to find answer for this one

268. To exit out of a function you should use _____?

return;

exit;

(all of these)

exit();

Answer

Correct Answer: return;

Note: This Question is unanswered, help us to find answer for this one

269. If an error occures in an Express middleware function, what is the best way to pass the error object to the subsequent handlers?

function( req, res){ ... res.error( err ); }

function( req, res ){ ... console.error( err ) }

function( req, res, next){ ... next( err ); }

function( req, res ){ ... throw err; }

Answer

Correct Answer: function( req, res, next){ ... next( err ); }

Note: This Question is unanswered, help us to find answer for this one

270. What is typically the first parameter in node.js callback functions?

Function

Status

Error

Options

Result

Answer

Correct Answer: Error

Note: This Question is unanswered, help us to find answer for this one

271. Which function allows you to chain event listeners?

connect()

event()

on()

chain()

Answer

Correct Answer: on()

Note: This Question is unanswered, help us to find answer for this one

272. Which of the following is a standard node module, included with the default install?

request

csv

async

Answer

Correct Answer: fs

Note: This Question is unanswered, help us to find answer for this one

273. What syntax is correct for reading environment variable?

node.environment.process['ENV_VARIABLE']

process.env.ENV_VARIABLE

process.ENV_VARIABLE

process.environment.ENV_VARIABLE

Answer

Correct Answer: process.env.ENV_VARIABLE

Note: This Question is unanswered, help us to find answer for this one

274. The Cryptography module requires OpenSSL.

Sometimes

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

275. The interactive shell is also called_____?

REPL

HTTPS

SIGINT

Interface

Answer

Correct Answer: REPL

Note: This Question is unanswered, help us to find answer for this one

276. How do you start the node.js REPL?

noderepl

node

nodejs

Answer

Correct Answer: node

Note: This Question is unanswered, help us to find answer for this one

277. Timer functions are built into node.js, you do not need to require() this module in order to use them.

true

false

Answer

Correct Answer: true

Note: This Question is unanswered, help us to find answer for this one

278. Which of these is a built-in module that can be used for unit testing in Node.js?

Test

Error

Assert

Fail

Answer

Correct Answer: Assert

Note: This Question is unanswered, help us to find answer for this one

279. What does the Zlib module provide?

It also offers a set of wrappers for OpenSSL's hash, hmac, cipher, decipher, sign and verify methods.

Realtime application framework for Node.JS, with HTML5 WebSockets and cross-browser fallbacks support.

Bindings to application logging classes

Bindings to Gzip/Gunzip, Deflate/Inflate, and DeflateRaw/InflateRaw classes

Answer

Correct Answer: Bindings to Gzip/Gunzip, Deflate/Inflate, and DeflateRaw/InflateRaw classes

Note: This Question is unanswered, help us to find answer for this one

280. True or False: node.js runs in a single thread.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

281. How can I call an object function from my module if my module name is "iModule"?

require('iModule').mObject();

request('iModule').mObject();

require('iModule').prototype.mObject();

import('iModule').mObject();

Answer

Correct Answer: require('iModule').mObject();

Note: This Question is unanswered, help us to find answer for this one

282. What interface is used to create a server through Node.js

server

url

http

web

Answer

Correct Answer: http

Note: This Question is unanswered, help us to find answer for this one

283. What method is used to parse JSON using NodeJS?

JSON.parseJSON()

JSON.toJSON()

None of the above

JSON.parse();

Answer

Correct Answer: JSON.parse();

Note: This Question is unanswered, help us to find answer for this one

284. Where does Node run on your machine?

in the registry

as an application

in your browser

in your TIF file

Answer

Correct Answer: as an application

Note: This Question is unanswered, help us to find answer for this one

285. How do you cause a function to be invoked at a specified time later?

wait(1000)

setTimeout(fn, 1000)

process.wait(1000)

process.wait(fn, 1000)

process.delay(1000, fn)

Answer

Correct Answer: setTimeout(fn, 1000)

Note: This Question is unanswered, help us to find answer for this one

286. In the following Express route stack, which handler will be called for "GET /item/23"? app.get("/", routes.index ); app.get("/item", routes.item ); app.get("/item/:id", routes.id ); app.post("/item/:id", routes.post );

routes.post

routes.id

routes.item

routes.index

Answer

Correct Answer: routes.id

Note: This Question is unanswered, help us to find answer for this one

287. What does the require call return?

none of the above

module.exports object

string object

Answer

Correct Answer: module.exports object

Note: This Question is unanswered, help us to find answer for this one

288.
Running the following code, what will the console output?
var http = require('http');
http.createServer( function (request, response) { response.writeHead(200,
{'Content-Type': 'text/plain'});
response.end('Hello World\n'); } ).listen(8000);
console.log('Server running at http://localhost:8000/');

Hello World

undefined

Hello World\n

Server running at http://localhost:8000/

Answer

Correct Answer: Server running at http://localhost:8000/

Note: This Question is unanswered, help us to find answer for this one

289. node.js excels at dealing with:

JRE optimization

fibonacci benchmarks

I/O-bound tasks

Answer

Correct Answer: I/O-bound tasks

Note: This Question is unanswered, help us to find answer for this one

290. Which npm command will load all dependencies in the local node_modules folder?

npm start

npm load

npm install

npm run

Answer

Correct Answer: npm install

Note: This Question is unanswered, help us to find answer for this one

291. Which is of the following is a potential advantage of using Node.js?

Node.js is non-blocking and scalable.

Node.js allows you use the same language on the server and client.

Node.js is powered by a high-performance V8 engine.

All of these.

Answer

Correct Answer: All of these.

Note: This Question is unanswered, help us to find answer for this one

292. What function is used to write out application errors/events?

process.write

system.inform

util.log

console.log

Answer

Correct Answer: console.log

Note: This Question is unanswered, help us to find answer for this one

293. What interface is used to access folders on your local drive

file

fso

drive

Answer

Correct Answer: fs

Note: This Question is unanswered, help us to find answer for this one

294.
In this code:
function myLog(err, data) {
console.log(err, data);
} fs.readFile('/tmp/sample', myLog);
The function 'myLog' is used as a(an):

Object method

Prototype

Filter

Callback

Answer

Correct Answer: Callback

Note: This Question is unanswered, help us to find answer for this one

295. What is the code to access the DNS module?

require('dns');

request(dns);

npm_module('dns');

req('dns');

Answer

Correct Answer: require('dns');

Note: This Question is unanswered, help us to find answer for this one

296. Use _____ to step through your code.

manual

URL string

ruler

breakpoints

Answer

Correct Answer: breakpoints

Note: This Question is unanswered, help us to find answer for this one

297. What kind of application is better suited to node.js?

General Purpose Applications

I/O Bound Applications

CPU Bound Applications

Answer

Correct Answer: I/O Bound Applications

Note: This Question is unanswered, help us to find answer for this one

298. How do you call a function attached to an object that will be executed when the object emits an event?

Listener

Process

Link

Log

Buffer

Answer

Correct Answer: Listener

Note: This Question is unanswered, help us to find answer for this one

299. What does Node.js run on?

database

client

SAN

server

Answer

Correct Answer: server

Note: This Question is unanswered, help us to find answer for this one

300. What does "npm" stand for?

Node Packaged Modules

Node Package Manager

None of these

Node Process Manager

Answer

Correct Answer: Node Package Manager

Note: This Question is unanswered, help us to find answer for this one

301. Which of the following command-line arguments to "npm install" will allow a module to be installed outside the project folder?

--global

--save

--link

Answer

Correct Answer: --global

Note: This Question is unanswered, help us to find answer for this one

302. How does one get access to Node.js?

a part of the OS

a part of the registry

download the install

a part of the browser

Answer

Correct Answer: download the install

Note: This Question is unanswered, help us to find answer for this one

303. A popular web application for framework for node?

spring

maven

express

tab

Answer

Correct Answer: express

Note: This Question is unanswered, help us to find answer for this one

304. Why is Node.js important?

Chrome comes bundled with Node.js and everyong needs Chrome

Javascript is powerless without the aid of Node.js

It allows asynchronous processing in the background without interupting the user

Browsers are weak, adding Node.js to your browser beefs it up

Answer

Correct Answer: It allows asynchronous processing in the background without interupting the user

Note: This Question is unanswered, help us to find answer for this one

305. In node.js you can write and run code in what language?

Javascript and Java

Java

Javascript

C++

any language if you have the compiler for those installed on your machine

Answer

Correct Answer: Javascript

Note: This Question is unanswered, help us to find answer for this one

306. True or False: node.js can call other command line scripts.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

307. Which of the following can be created and managed using node.js?

All of these

Chatrooms

Webservers

Spambots

Data Compilers

Answer

Correct Answer: All of these

Note: This Question is unanswered, help us to find answer for this one

308. WebSockets with Socket.io can be used to?

Send messages from one client to another.

All of these.

Send messages from the client to the server.

Send messages from the server to the client.

Answer

Correct Answer: All of these.

Note: This Question is unanswered, help us to find answer for this one

309. What is a Buffer?

Similar to setTimeout in the browser

Raw memory allocated outside the v8 heap

A String

Answer

Correct Answer: Raw memory allocated outside the v8 heap

Note: This Question is unanswered, help us to find answer for this one

310. What is node.js based on?

Unix's Websocket layer

Cocoa's Unix backend

Chrome's JavaScript runtime

Answer

Correct Answer: Chrome's JavaScript runtime

Note: This Question is unanswered, help us to find answer for this one

311. A module is an____?

Object

integer

variable

an event

Answer

Correct Answer: Object

Note: This Question is unanswered, help us to find answer for this one

312. How do you output to console in node.js?

util.log or console.log

trace or log

sys.puts or util.puts

Answer

Correct Answer: util.log or console.log

Note: This Question is unanswered, help us to find answer for this one

313. How do you require a module?

#import mymodule

#include mymodule

var module = require('mymodule')

Answer

Correct Answer: var module = require('mymodule')

Note: This Question is unanswered, help us to find answer for this one

314. Which is a comment in node?

//comment

Comment

?Comment

>>Comment

Answer

Correct Answer: //comment

Note: This Question is unanswered, help us to find answer for this one

315. To declare a variable use what keyword?

integer

float

var

string

Answer

Correct Answer: var

Note: This Question is unanswered, help us to find answer for this one

316. REPL is:

Read-Eval-Print-Loop, a way to interactively run code

Replicates an existing Buffer, optionally resetting the size

A string replacement method

REnder PLaceholders - a templating function

Answer

Correct Answer: Read-Eval-Print-Loop, a way to interactively run code

Note: This Question is unanswered, help us to find answer for this one

317. If you have a node program called example.js, how would that be excuted?

launch example.js

start example.js

node example.js

exec example.js

Answer

Correct Answer: node example.js

Note: This Question is unanswered, help us to find answer for this one

318. If you have a problem with your code, where would you look?

os.log

app.log

console.log

system.log

Answer

Correct Answer: console.log

Note: This Question is unanswered, help us to find answer for this one

319. net.Server emits an event every time a ____ connects to the server.

object

peer

packet

cat cable

Answer

Correct Answer: peer

Note: This Question is unanswered, help us to find answer for this one

320. What program is used to programmtically control the browser?

vbscript

javascript

perl

Answer

Correct Answer: javascript

Note: This Question is unanswered, help us to find answer for this one

Node.js MCQs | Topic-wise

MCQ on Basic Node.js

General Node.js MCQs

Node.js Subjects

More Resources

Node.js MCQ

Node.js Skill Assessment

Node.js PDF

Related MCQs

Object Oriented Programming (OOP) MCQs

Object–relational Mapping MCQs

Objective C MCQs

OOPS Concepts MCQs

OpenGL MCQs

Basic Node.js MCQ

1. Which coice is a core module in Node?

2. When exploring the Node documentation's features, what are the stability ratings?

3. How can ECMAScript modules be used natively in Node?

4. What is the importance of having good practices around status code in your response?

5. What is used for parsing and running Javascript in Node.js?

6. How does it affect the performance of a web application when an execution path contains a CPU-heavy operation, such as calculating a long Fibonacci sequence?

7. What is Node built on?

8. Which assert module method is usually used to test the error-first argument in callbacks?

9. Is it possible to write tests in Node.js without an external library?

10. What is a process object and its role?

11. What is the purpose of N-API?

12. How can you convert path segments into a string using the platform-specific separator as a delimiter?

13. What is the correct way to pipe a readable stream and a writable stream?

14. Which choice is not a Node global object?

15. You have to read a large text file, replace some words in it, and write it back to a new file. You know that the memory on your target system is limited. What should you do?

16. How would you determine the number of cluster instances to start when using the cluster module?

17. Which core module in Node can you use to compile and run JavaScript code in a sandbox environment?

18. Which statement about event emitters is false?

19. Which statement is true about Node.js and threads?

20. Which global object acts like a bridge between a Node script and the host operating system?

21. Which Node.js module should you use when you need to decode raw data into strings?

22. Which core module in Node provides an API to register callbacks to track asynchronous resources created inside a Node.js application?

23. Which core module in Node can you use for testing?

24. Which file does node-gyp use to read the build configuration of a module?

25. What does REPL stand for?

26. According to the rules of semantic versioning, what does a release incrementing the third number in an npm version string communicate to users about the release changes?

27. Which line imports a promise-based version of the readFile method?

28. Which core Node module has wrappers for OpenSSL methods?

29. Which core module in Node can you use to take advantage of multicore systems?

30. What can you export with module.exports?

31. What does the .node file extension represent?

32. Which library provides Node.js with the event loop?

33. What are the arguments passed to the module wrapper function?

34. What is the command to get a list of available commands for Node.js?What is the command to get a list of available commands for Node.js?

35. Which choice is not a valid method on event emitters?

36. You have a script.js file with the single line of code shown here. What will be the output of executing script.js with the node command? console.log(arguments);

37. Which of the following is NOT a valid stream in Node?

38. What is the Node LTS version?

39. What is the purpose of the file system (fs) module?

40. How do you start a Node application, if the entry file is indexjs?

41. How do you make an HTTP server object active and listen to requests on certain ports?

42. What is the purpose of the path module?

43. When you run JavaScript in a Node.js application, which of the following elements in a Node.js stack actually executes that JavaScript?

44. Which console method can be used to print the stack trace to the point of its execution?

45. If the child_process module methods are in scope, what is a current way to execute the command ps -ef using a child process?

46. Which module variable holds the resolved absolute path of the current module file?

47. If EventEmitter is in scope, which of the following lines of code will have an event emitter emitting a change event?

48. Which statement is true when you run the code shown below? require('child_process').fork('script.js');

49. How can you use the promise API with a callback-based function such as child_process.exec?

50. What is the command to silence all process warnings?

51. Which object is used to manage the cache of required modules?

52. Which of the following is a method on the console object?

53. How can you count the number of logical CPUs on the machine that is running Node?

54. Which CLI option can you use to debug a node script in Chrome DevTools?

55. What is the Api that is designed to insulate Addons from changes in the underlying JavaScript engine?

56. Can you create an https web server with Node.js?

57. How do you check that a value is a date object in Node?

58. Which of the following DNS module methods uses the underlying OS facilities and does not necessarily perform any network communication?

59. Which fs module method can be used to read the content of a file without buffering it in memory?

60. Which of the following modules is NOT a built-in module in Node?

61. Which of the following Buffer class methods returns an uninitialized buffer?

62. Which of the following is a core module in Node?

64. Which of the following statements is/are correct about working with the MongoDB server and the Mongodb module?

65. Carefully study the code snippet given in the image and determine which of the following lines of code contain errors.

68. Which two of the following statements will generate the output "Hello Node.js"?

69. Which of the following is/are not (a) valid state(s) of promise used in Node.js?

72. Which of the following classes is/are always used for connecting to a MongoDB server?

74. What will be the output of the following code snippet in Node.js?var x = 2.4;var y = 9;console.log(y/x)

77. In the following program of an asynchronous test, which line of code contains an error?Line 1: exportsaynchabc = function (abc)[Line 2: setTimeout(function (){Line 3: abc.equal(false, true);Line 4: abc.done(true. false);Line 5: } 1200);Line 6: };

78. What will be the output of the following code snippet?var x =[8, 12, 3];x.push(5);x.unshift(1);console.log(x[0]);

79. In Node.js, which of the following functions is used by an Express app to accept the middleware?

82. Which of the following is the purpose of installing the NPM module, optimist?

83. Which of the following operators checks whether the given f‌ield is an array and contains all the values in the given array of values or not?

84. State if true or false.In node.js, applications are processed asynchronously on a single thread.

85. Which of the following command line arguments can be used to convert a file named "base3.js" into an AMD module?

86. What will be the output of the following program?var name = "John";var dob = 15;console.log("%s was born on %d May, 1987", name, dob)

87. Choose True or False.In MongoDB, it is possible to insert two values with same_id values into a collection.

89. Which of the following is/are true about the http.ServerResponse object in Node.js?1. It is created by an HTTP server.2. It is passed as f‌irst parameter to the "request" event.3. It is a writable stream.

90. Suppose we have the following code in a Node.js f‌ile.var path = require("path");var completePath ='lexample/test/f‌irsthtml';Which of the following lines of code should be added to the above code so that the output 'f‌irst.html' is displayed?

74.
What will be the output of the following code snippet in Node.js?
var x = 2.4;
var y = 9;
console.log(y/x)

77.
In the following program of an asynchronous test, which line of code contains an error?
Line 1: exportsaynchabc = function (abc)[
Line 2: setTimeout(function (){
Line 3: abc.equal(false, true);
Line 4: abc.done(true. false);
Line 5: } 1200);
Line 6: };

78.
What will be the output of the following code snippet?
var x =[8, 12, 3];
x.push(5);
x.unshift(1);
console.log(x[0]);

84.
State if true or false.
In node.js, applications are processed asynchronously on a single thread.

86.
What will be the output of the following program?
var name = "John";
var dob = 15;
console.log("%s was born on %d May, 1987", name, dob)

87.
Choose True or False.

In MongoDB, it is possible to insert two values with same_id values into a collection.

89.
Which of the following is/are true about the http.ServerResponse object in Node.js?
1. It is created by an HTTP server.
2. It is passed as f‌irst parameter to the "request" event.
3. It is a writable stream.

90.
Suppose we have the following code in a Node.js f‌ile.
var path = require("path");
var completePath ='lexample/test/f‌irsthtml';
Which of the following lines of code should be added to the above code so that the output 'f‌irst.html' is displayed?

91.
What output will be generated on the execution of the following code snippet in Node.js?
function Test()
{}
console.log(Test.prototype.constructor === Test);

93.
What output will be generated when the following statements are executed in Node.js?
var x = H;
console.log(x);
x.value = 55;
console.log(x);

96.
Which of the following is the correct program code that repeatedly calls a function after every two seconds for continuous eight seconds. and after that clears the interval with the message "Loop ends" and exits the application?

98.
The following function belongs to which of the given http.Server events in Node.js:
function (request, socket, head){}

105.
Which of the following HTTP methods for collection URLs is used to replace the entire collection with a new collection?

106.
Study the following code snippet and determine which code line contains an error.
1. var connect =require('connect'),
2. http = require('http');
3. var app = connect();
4. http.createServer(http).listen(3000);
5. console.log('port 3000');

107.
The HTML code given in the image, when executed, should create a button and hovering over this button should display ‘New Button'. Which of the following code snippets should replace '??' in the given code to obtain the desired result?

108.
What will be the output of the following code snippet?
var myVar = 'First Value';
if (true) {
(function () {
var myVar ='Second Value'
})();
}
console.log(myVar);

112.
What output will be generated on the execution of the following lines of code?
var path = require('path');
console.log(path.join('test1'. 'ltest2'. 'test3'));

115.
Which of the following code snippets should be added at the top of those files that use the mongodb module?

117.
Which of the following methods is used for setting a signed cookie?
Note: Consider the function inside which the method setting is performed as: function (r, s).

121.
In Node.js. which of the following modules use(s) the 'require' function?
1) Core module
2) File module
3) External node_modules

128.
Choose True or False:
Angular.js uses two-way data-binding for attaining synchronization between the view and the model.

129.
What will be the correct output of the following function?
process.nextTick(function(){
console.log('Example')}); console.log('Hello'); console.log('World');

130.
Which of the following is a valid JSON object in Node.js?

131.
However, lines 11 and 13 contain errors. Which of the following is the correct syntax of line 11 and line 13?

132.
The program given in the image should provide the following output:

134.
How to fire event using EventEmitter: var events = new events.EventEmitter();

135.
Which of the following code can make a request to a web server?

136.
For Linux, which of the following environment variables is needed to set for successful NodeJS installation?

137.
Which are the following debug commands to debug node server?

138.
What output will this code produce in the console? const EventEmitter = require('events');
const myEmit = new EventEmitter();
myEmit.on('slick', () => {});
myEmit.on('key', () => {});
const symbol = Symbol('init');
myEmit.on(symbol, () => {});
console.log(myEmit.eventNames());

139.
Which of the following code converts a buffer buf to JSON object?

140.
What is the output when the following code is executed? var http = require("http"); var server = http.createServer(function(req, res) { res.writeHead(200, {"Content-Type": "text/html"}); res.end(` HTML Render Response

142.
How can you access the command line arguments passed to your program?

143.
Select valid stream instances:

144.
How to convert from Buffer instance to string of base64?

145.
Which method of fs module is used to truncate a file?

146.
What does the following line of code do? var http = require("http");

147.
Which of the following is true about writable stream?

148.
Which code will return total system memory in bytes? os is included like this: const os = require('os');