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 1Which of following command starts a REPL session?

Answer : A

Explanation

REPL can be started by simply running node on shell/console without any argument.

Q 2 - Which of the following command will show version of Node?

A - $ npm --version

B - $ node --version

C - $ npm getVersion

D - $ node getVersion

Answer : B

Explanation

Executing $ node --version command will show the version of Node instance.

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 of the following is true about fs module of Node?

A - Every method in fs module have synchronous as well as asynchronous form.

B - Asynchronous methods of fs module take last parameter as completion function callback and first parameter of the callback function as error.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Every method in fs module have synchronous as well as asynchronous form. Asynchronous methods of fs module take last parameter as completion function callback and first parameter of the callback function as error.

Q 5 - Which of the following is true about __dirname global object?

A - The __dirname represents the name of the directory that the currently executing script resides in.

B - The __dirname represents the resolved absolute path of code file.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

The __dirname represents the name of the directory that the currently executing script resides in.

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 - net.isIP(input) returns 0 for invalid input.

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 error event when there is any error receiving or writing data.

A - false

B - true

Answer : B

Explanation

A stream fires error event when there is any error receiving or writing data.

nodejs_questions_answers.htm