Node.js Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to Node.js Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - Which of the following statement is valid to use a Node module http in a Node based application?

A - var http = require("http");

B - var http = import("http");

C - package http;

D - import http;

Answer : A

Explanation

Require directive is used to load a Node module(http) and store returned its instance(http) into its variable(http).

Q 2 - What is use of Underscore Variable in REPL session?

A - to get the last command used.

B - to get the last result.

C - to store the result.

D - None of the above.

Answer : B

Explanation

You can use undercore _ to get the last result.

Q 3 - Which of the following is true about readable stream?

A - Readable stream is used for read operation.

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

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Readable stream is used for read operation and its output can be input to a writable stream.

Q 4 - Which method of fs module is used to write a file?

A - fs.write(path, flags[, mode], callback)

B - fs.writeFile(path, flags[, mode], callback)

C - fs.writePath(path, flags[, mode], callback)

D - None of the above.

Answer : B

Explanation

fs.writeFile(path, flags[, mode], callback) is the method which is used to write a file.

Q 5 - Which of the following is true about clearTimeout(t) global function?

A - The clearTimeout( t ) global function is used to stop a timer that was previously created with setTimeout().

B - The clearTimeout( t ) function returns an opaque value that represents the timer which can be used to clear the timer.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

The clearTimeout( t ) global function is used to stop a timer that was previously created with setTimeout(). Here t is the timer returned by setTimeout() function.

Q 6 - Which of the following module is required for operating system specific operations?

A - os module

B - fs module

C - net module

D - None of the above.

Answer : A

Explanation

Node.js os module provides a few basic operating-system related utility functions.

Q 7 - Which of the following code print the platform of operating system?

A - console.log('platform : ' + os.platform);

B - console.log('platform : ' + os.platform());

C - console.log('platform : ' + os.getPlatform());

D - None of the above.

Answer : B

Explanation

os.platform() returns the operating system platform.

Q 8 - net.isIP(input) returns 4 for IP version 4 addresses.

A - true

B - false

Answer : A

Explanation

net.isIP(input) tests if input is an IP address. Returns 0 for invalid strings, returns 4 for IP version 4 addresses, and returns 6 for IP version 6 addresses.

Q 9 - Which of the following is true about exec methd of child_process module.

A - The exec() method runs a command in a shell and buffers the output.

B - The exec() method returns a buffer with a max size.

C - The exec() method waits for the process to end and tries to return all the buffered data at once.

D - All of the above.

Answer : D

Explanation

child_process.exec method runs a command in a shell and buffers the output. It returns a buffer with a max size and waits for the process to end and tries to return all the buffered data at once.

Q 10 - A stream fires finish event when all data has been flushed to underlying system.

A - true

B - false

Answer : A

Explanation

A stream fires finish event when all data has been flushed to underlying system.

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