Node.js MCQ Questions Answers

1. What program is used to programmtically control the browser?

2. net.Server emits an event every time a ____ connects to the server.

3. If you have a problem with your code, where would you look?

4. If you have a node program called example.js, how would that be excuted?

5. REPL is:

6. To declare a variable use what keyword?

7. The 'js' in Node.js stands for?

8. Which is a comment in node?

9. How do you require a module?

10. NPM is a...

11. How do you output to console in node.js?

12. A module is an____?

13. What is node.js based on?

14. What is a Buffer?

15. WebSockets with Socket.io can be used to?

16. Which of the following can be created and managed using node.js?

17. Node.js is stored on your____?

18. True or False: node.js can call other command line scripts.

19. In node.js you can write and run code in what language?

20. Why is Node.js important?

21. A popular web application for framework for node?

22. How does one get access to Node.js?

23. Which of the following command-line arguments to 'npm install' will allow a module to be installed outside the project folder?

24. What Javascript Engine does node.js use?

25. What does 'npm' stand for?

26. What does Node.js run on?

27. How do you call a function attached to an object that will be executed when the object emits an event?

28. What kind of application is better suited to node.js?

29. Use _____ to step through your code.

30. What is the code to access the DNS module?

31. In this code: function myLog(err, data) { console.log(err, data); } fs.readFile('/tmp/sample', myLog); The function 'myLog' is used as a(an):

32. What interface is used to access folders on your local drive

33. What function is used to write out application errors/events?

34. Which is of the following is a potential advantage of using Node.js?

35. Which npm command will load all dependencies in the local node_modules folder?

36. node.js excels at dealing with:

37. 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/');

38. What does the require call return?

39. 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 );

40. How do you cause a function to be invoked at a specified time later?

41. Where does Node run on your machine?

42. What is REPL?

43. What method is used to parse JSON using NodeJS?

44. What interface is used to create a server through Node.js

45. What is node.js?

46. How can I call an object function from my module if my module name is 'iModule'?

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

48. What does the Zlib module provide?

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

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

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

52. The interactive shell is also called_____?

53. The Cryptography module requires OpenSSL.

54. What syntax is correct for reading environment variable?

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

56. Which function allows you to chain event listeners?

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

58. Which of these statements about Express is true?

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

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

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

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

63. Which company manages and maintains node.js?

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

65. 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'

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

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

68. In Express, which of these Response methods can NOT automatically end the response?

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

70. How to delete a file in node.js?

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

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

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

74. The VM module allows one to:

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

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

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

78. Node.js is a truly parallel technology.

79. 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'

80. The process object is an instance of____?

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

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

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

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

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

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

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

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

89. The Javascript used in node.js:

90. To parse a URL string use____?

91. What is the name of the module system used in node.js?

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

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

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

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

96. 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');

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

98. Which of these is NOT a global object?

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

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