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 - Why code written in Node.JS is pretty fast although being written in JavaScript?

A - Node.JS internally converts JavaScript code to Java based code and then execute the same.

B - Node.JS internally converts JavaScript code to C based code and then execute the same.

C - Being built on Google Chrome's V8 JavaScript Engine.

D - None of the above.

Answer : C

Explanation

Being built on Google Chrome's V8 JavaScript Engine, Node.js library is very fast in code execution.

Q 2 - Which of the following command will show all the modules installed locally.

Answer : B

Explanation

Executing $ npm ls command will show all the modules installed locally.

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

A - writable stream is used for write 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

Writable stream is used for write operation and it can take output of readable stream as input.

Q 4 - Which method of fs module is used to get information about file?

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

B - fs.stat(path, callback)

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

D - None of the above.

Answer : B

Explanation

fs.stat(path, callback) is the method which is used to get information about a file.

Q 5 - Which method of fs module is used to remove a directory?

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

B - fs.rmdir(path, callback)

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

D - None of the above.

Answer : B

Explanation

fs.rmdir(path, callback) is the method which is used to remove a directory.

Q 6 - Which of the following code prints memory usage?

A - console.log(process.memoryUsage());

B - console.log('Current version: ' + process.memory());

C - console.log('Current version: ' + process.getMemory());

D - None of the above.

Answer : A

Explanation

process.memoryUsage() can be used to get the memory usage.

Q 7 - Which of the following API creates a server?

A - net.createServer([options][, connectionListener])

B - net.connect(options[, connectionListener])

C - net.createConnection(port[, host][, connectListener])

D - None of the above.

Answer : A

Explanation

net.createServer([options][, connectionListener]) creates a new TCP server. The connectionListener argument is automatically set as a listener for the 'connection' event.

Q 8 - Which of the following module is required for DNS specific operations?

A - dns module

B - web module

C - net module

D - None of the above.

Answer : A

Explanation

Node.js dns module is used to do actual DNS lookup as well as to use underlying operating system name resolution functionalities.

Q 9 - Which of the following module is required to create a child process?

A - process module

B - child_process module

C - child module

D - web module

Answer : B

Explanation

Node provides child_process module which provides ways to create child process.

Q 10 - Child processes always have three streams child.stdin, child.stdout, and child.stderr which may be shared with the stdio streams of the parent process.

A - true

B - false

Answer : A

Explanation

Child processes always have three streams child.stdin, child.stdout, and child.stderr which may be shared with the stdio streams of the parent process.

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