Node.js MCQs (Chapterwise Multiple Choice Questions)

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 & Explanation

Correct Answer: Event names must be camelCase strings.

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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 & Explanation

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

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Which of the following objects is a stream

Process.uptime

Process.stdout

Process

Buffer

Answer & Explanation

Correct Answer: Process.stdout

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What is node.js based on?

Unix's Websocket layer

Cocoa's Unix backend

Chrome's JavaScript runtime

Answer & Explanation

Correct Answer: Chrome's JavaScript runtime

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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 & Explanation

Correct Answer: break

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

.gyprc

Binding.gyp

Gyp.json

Package.gyp

Answer & Explanation

Correct Answer: Binding.gyp

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What is Node built on?

Python

V8 JavaScript engine

PHP

C

Answer & Explanation

Correct Answer: V8 JavaScript engine

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

create

order

require

suggest

Answer & Explanation

Correct Answer: require

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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 )

4

2

1

3

Answer & Explanation

Correct Answer: 4

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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 & Explanation

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

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