Question 1

What is Node.js?

Accepted Answer

A runtime environment that executes JavaScript code outside the browser

Answer

A JavaScript library for building user interfaces

Answer

A database management system

Answer

A CSS preprocessor

Question 2

Which JavaScript engine powers Node.js?

Accepted Answer

V8

Answer

SpiderMonkey

Answer

JavaScriptCore

Answer

Chakra

Question 3

What does npm stand for?

Accepted Answer

Node Package Manager

Answer

New Programming Module

Answer

Node Process Monitor

Answer

Network Package Module

Question 4

What does the require() function do in Node.js?

Accepted Answer

Imports a module or file into the current script

Answer

Creates a new HTTP request

Answer

Requires the user to input data

Answer

Checks if a module is installed

Question 5

What is the event loop in Node.js?

Accepted Answer

A mechanism that allows Node.js to perform non-blocking I/O operations

Answer

A loop that runs all JavaScript code synchronously

Answer

A built-in debugging tool

Answer

A function that repeats every second

Question 6

Which of the following is NOT a built-in Node.js module?

Accepted Answer

express

Answer

fs

Answer

path

Answer

http

Question 7

What does package.json contain?

Accepted Answer

Metadata about the project including name, version, and dependencies

Answer

The compiled JavaScript output

Answer

Environment variables

Answer

The Node.js source code

Question 8

What is the fs module used for in Node.js?

Accepted Answer

Interacting with the file system — reading, writing, and deleting files

Answer

Formatting strings

Answer

Creating web sockets

Answer

Fetching data from APIs

Question 9

What is the difference between fs.readFile() and fs.readFileSync()?

Accepted Answer

readFile is asynchronous (non-blocking); readFileSync is synchronous (blocking)

Answer

readFile reads text only; readFileSync reads binary files

Answer

readFile is faster; readFileSync is slower

Answer

There is no difference

Question 10

What does process.env provide in Node.js?

Accepted Answer

An object containing the user's environment variables

Answer

A list of all running Node.js processes

Answer

Access to the current process memory usage

Answer

The Node.js version number

Question 11

How do you create a simple HTTP server in Node.js?

Accepted Answer

Using http.createServer() from the built-in http module

Answer

Using server.listen() directly

Answer

Using require('server').start()

Answer

Using net.createServer()

Question 12

What is module.exports in Node.js?

Accepted Answer

An object that defines what a module exposes to other files when required

Answer

A way to export environment variables

Answer

A method to export HTML templates

Answer

A way to export CSS styles

Question 13

What command initializes a new Node.js project and creates a package.json file?

Accepted Answer

npm init

Answer

npm start

Answer

npm install

Answer

node setup

Question 14

What is __dirname in Node.js?

Accepted Answer

The absolute path of the directory containing the currently executing file

Answer

The name of the current directory's parent

Answer

A global variable for the database directory

Answer

The home directory of the OS user

Question 15

What is the path module primarily used for?

Accepted Answer

Working with and manipulating file and directory paths

Answer

Sending HTTP requests to a server

Answer

Reading and writing files

Answer

Creating web routes in Express

Question 16

What is an EventEmitter in Node.js?

Accepted Answer

A class that facilitates communication between objects using events (emit/on pattern)

Answer

A built-in tool that sends emails

Answer

A function that triggers browser alerts

Answer

A timer that emits a signal every second

Question 17

What does nodemon do?

Accepted Answer

Automatically restarts the Node.js application when file changes are detected

Answer

Monitors network traffic in Node.js apps

Answer

Manages Node.js versions on your machine

Answer

Runs Node.js apps in a Docker container

Question 18

Which command correctly installs the express package as a project dependency?

Accepted Answer

npm install express

Answer

npm install express --save-dev

Answer

node install express

Answer

npm add express --global

Question 19

What is middleware in an Express.js application?

Accepted Answer

A function that executes during the request-response cycle with access to req, res, and next

Answer

A database driver for MongoDB

Answer

A built-in Node.js caching layer

Answer

A type of route that handles errors only

Question 20

What does the following code output?
console.log('Start'); setTimeout(() => console.log('Timeout'), 0); console.log('End');

Accepted Answer

Start, End, Timeout

Answer

Start, Timeout, End

Answer

Timeout, Start, End

Answer

End, Start, Timeout

Node.js MCQ for Beginners – 20 Practice Questions with Answers

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