Node.js Mock Test

This section presents you various set of Mock Tests related to Node.js Framework. You can download these sample mock tests at your local machine and solve offline at your convenience. Every mock test is supplied with a mock test key to let you verify the final score and grade yourself.

Node.js Mock Test I

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 Node.JS?

A - Node.js is a web server.

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

C - Node.js is a java based framework.

D - None of the above.

Answer : B

Explanation

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

Q 3 - 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 4 - 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 5 - How Node based web servers are different from traditional web servers?

A - Node based server process request much faster than traditional server.

B - Node based server uses a single threaded model and can services much larger number of requests than traditional server like Apache HTTP Server.

C - There is no much difference between the two.

D - None of the above.

Answer : B

Explanation

Node based server uses a single threaded model and can services much larger number of requests than traditional server like Apache HTTP Server.

Q 6 - In which of the following areas, Node.js is perfect to use?

A - I/O bound Applications

B - Data Streaming Applications

C - Data Intensive Realtime Applications (DIRT)

D - All of the above.

Answer : D

Explanation

Node.js is proving itself a perfect technology partner for all of the above mentioned areas.

Q 7In which of the following areas, Node.js is not advised to be used?

A - Single Page Applications

B - JSON APIs based Applications

C - CPU intensive applications

D - Data Intensive Realtime Applications (DIRT)

Answer : C

Explanation

It is not advisable to use Node.js for CPU intensive applications.

Q 8 - Which of the following statement is valid to use a Node module http in a Node based application?

A - var http = require("http");

B - var http = import("http");

C - package http;

D - import http;

Answer : A

Explanation

Require directive is used to load a Node module(http) and store returned its instance(http) into its variable(http).

Q 9REPL stands for.

A - Research Eval Program Learn

B - Read Eval Print Loop

C - Read Earn Point Learn

D - Read Eval Point Loop

Answer : B

Explanation

REPL stands for Read Eval Print Loop and it represents a computer environment like a window console or Unix/Linux shell where a command is entered and system responds with an output in interactive mode.

Q 10Which 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 11 - 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 12 -What npm stands for?

A - Node Package Manager

B - Node Project Manager

C - New Project Manager

D - New Package Manager

Answer : A

Explanation

npm stands for Node Package Manager.

Q 13 - 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 14 - 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 15 - By default, npm installs any dependency in the local mode.

A - true

B - false

Answer : A

Explanation

By default, npm installs any dependency in the local mode.

Q 16 - By default, npm installs any dependency in the global mode.

A - true

B - false

Answer : B

Explanation

By default, npm installs any dependency in the local mode.

Q 17 - Which of the following command will show all the modules installed globally?

Answer : A

Explanation

Executing $ npm ls -g command will show all the modules installed globally.

Q 18 - 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 19 - Which of the following is true about package.json?

A - package.json is present in the root directory of any Node application/module.

B - package.json is used to define the properties of a package.

C - package.json can be used to update dependencies of a Node application.

D - All of the above.

Answer : D

Explanation

package.json is present in the root directory of any Node application/module and is used to define the properties of a package. It can also be used to update dependencies of a Node application.

Q 20 - What is Callback?

A - Callback is an asynchronous equivalent for a function.

B - Callback is a technique in which a method call back the caller method.

C - Both of the above.

D - None of the above.

Answer : A

Explanation

Callback is an asynchronous equivalent for a function.

Q 21 - 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 22 - Which of the following is true with respect to Node.

A - Every API of Node js are asynchronous.

B - Node being a single thread, and uses async function calls to maintain the concurrency.

C - Node thread keeps an event loop and whenever any task get completed, it fires the corresponding event which signals the event listener function to get executed.

D - All of the above.

Answer : D

Explanation

Node js is a single threaded application but it support concurrency via concept of event and callbacks. As every API of Node js are asynchronous and being a single thread, it uses async function calls to maintain the concurrency. Node uses observer pattern. Node thread keeps an event loop and whenever any task get completed, it fires the corresponding event which signals the event listener function to get executed.

Q 23 - Which of the following provides in-built events.