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.

Questions and Answers

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 - 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 - Node js is a single threaded application but supports concurrency.

Answer : A

Explanation

True! Node js is a single threaded application but it support concurrency via concept of event and callbacks.

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

A - fs.close(fd, callback)

B - fs.closeFile(fd, callback)

C - fs.closePath(fd, callback)

D - None of the above.

Answer : A

Explanation

fs.close(fd, callback) is the method which is used to close a file.

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

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

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

C - fs.readdir(path, callback)

D - None of the above.

Answer : C

Explanation

fs.readdir(path, callback)is the method which is used to read a directory.

Q 6 - Which of the following code prints current directory?

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

B - console.log('Current directory: ' + console.cwd());

C - console.log('Current directory: ' + process.currenWorkingDirectory());

D - None of the above.

Answer : A

Explanation

process.cwd() can be used to get the current working directory.

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 - Which of the following method resolves an ip address to an array of hostnames?

A - dns.reverse(ip, callback)

B - dns.resolve(hostname[, rrtype], callback)

C - dns.resolve4(hostname, callback)

D - None of the above.

Answer : A

Explanation

dns.reverse(ip, callback) resolves an ip address to an array of hostnames.

Q 9 - Which of the following is true about external binding with respect to domain module?

A - Error emmitter is executing its code within run method of a domain.

B - Error emmitter is added explicitly to a domain using its add method.

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Error emmitter is added explicitly to a domain using its add method in case of external binding.

Q 10 - A stream fires error event when there is any error receiving or writing data.

Answer : B

Explanation

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

nodejs_questions_answers.htm

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