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 - All APIs of Node.JS are.

A - Asynchronous

B - Synchronous

C - Both of the above.

D - None of the above.

Answer : A

Explanation

All APIs of Node.js library are aynchronous that is non-blocking.

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

A - $ npm --version

B - $ node --version

C - $ npm getVersion

D - $ node getVersion

Answer : A

Explanation

Executing $ npm --version command will show the version of npm instance.

Q 3 - Which of the following code converts a buffer buf to JSON object?

A - buf.toJSON()

B - buf.json()

C - buf.covertToJson()

D - buf.jsonify()

Answer : A

Explanation

buf.toJSON() converts a buffer buf to JSON object.

Q 4 - Which of the following is true about File I/O in Node applications?

A - Node implements File I/O using simple wrappers around standard POSIX functions.

B - Node File System (fs) module should be imported for File I/O opearations.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Node implements File I/O using simple wrappers around standard POSIX functions. Node File System (fs) module should be imported for File I/O opearations.

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 code prints process version?

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

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

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

D - None of the above.

Answer : B

Explanation

process.version can be used to get the current process version.

Q 7 - Which of the following is the correct way to get a joint path?

A - path.join('/test', 'test1', '2slashes/1slash', 'tab', '..')

B - path.combine('/test', 'test1', '2slashes/1slash', 'tab', '..')

C - buffer.join('/test', 'test1', '2slashes/1slash', 'tab', '..')

D - None of the above.

Answer : A

Explanation

path.join([path1][, path2][, ...]) joins all arguments together and normalize the resulting path.

Q 8 - Which of the following stands true for dns.lookup(hostname[, options], callback) method?

A - Resolves a hostname (e.g. 'google.com') into the first found A (IPv4) or AAAA (IPv6) record.

B - If options is not provided, then IP v4 and v6 addresses are both valid. If options is an integer, then it must be 4 or 6.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

dns.lookup(hostname[, options], callback) resolves a hostname (e.g. 'google.com') into the first found A (IPv4) or AAAA (IPv6) record. options can be an object or integer. If options is not provided, then IP v4 and v6 addresses are both valid. If options is an integer, then it must be 4 or 6.

Q 9 - Which of the following code can create a web server?

A - http.createServer(callback)

B - http.createWebServer(callback)

C - http.createHTTPServer(callback)

D - None of the above.