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 is true about Node.JS?

A - Node.js is a JavaScript based framework/platform built on Google Chrome's JavaScript V8 Engine.

B - Node.JS is used to delevop I/O intensive web applications like video streaming sites, single page applications and other web application.

C - Node.js is open source and is completely free to use.

D - All of the above.

Answer : D

Explanation

Node.js is a very powerful JavaScript based framework/platform built on Google Chrome's JavaScript V8 Engine. It is used to delevop I/O intensive web applications like video streaming sites, single page applications and other web application. Node.js is open source, completely free, and used by thousands of developers around the world.

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.

A - true

B - false

Answer : A

Explanation

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

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 method of fs module is used to delete a file?

A - fs.delete(fd, len, callback)

B - fs.remove(fd, len, callback)

C - fs.unlink(path, callback)

D - None of the above.

Answer : C

Explanation

fs.unlink(path, callback) is the method which is used to delete a file.

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 total free memory of operating system?

A - console.log('free memory : ' + os.freemem() + " bytes.");

B - console.log('free memory : ' + os.freemem + " bytes.");

C - console.log('free memory : ' + os.getFreeMemory() + " bytes.");

D - None of the above.

Answer : A

Explanation

os.freemem() returns the free amount of system memory in bytes.

Q 8 - Which of the following module is required for exception handling in Node?

Answer : C

Explanation

Node.js domain module is used to intercept unhandled error. These unhandled error can be intercepted using internal binding or external binding. If errors are not handled at all then they will simply crash the Node application.

Q 9 - What REST stands for?

A - REpresentational State Transfer

B - Resource Efficient State Transfer

C - Real Elegant State Transfer

D - Resource Elegant State Transfer