Master Node.js: A Comprehensive Guide for Beginners

Question 1

What is the purpose of the 'express' framework in Node.js for building web applications?

Accepted Answer

It provides tools for routing, middleware, and error handling, simplifying the development of scalable and efficient web applications.

Answer

It enables the creation of mobile applications.

Answer

It manages database connectivity.

Answer

It is a testing library for Node.js applications.

Question 2

Which of the following is a key feature of Node.js?

Accepted Answer

Node.js uses a single thread for event handling.

Answer

Node.js uses a blocking I/O model.

Answer

Node.js is a compiled language.

Answer

Node.js requires a database management system for data storage.

Question 3

Which of the following is NOT a key feature of Node.js?

Accepted Answer

Static typing

Answer

Cross-platform compatibility

Answer

Package management with npm

Answer

Asynchronous I/O handling

Question 4

What is the main purpose of the Node.js event loop?

Accepted Answer

To execute asynchronous operations without blocking the main thread

Answer

To compile JavaScript code into machine code

Answer

To manage HTTP connections

Question 5

Which core Node.js module is specifically designed for file system operations?

Accepted Answer

fs

Answer

http

Answer

util

Answer

path

Question 6

What is the primary function of the 'require()' function in Node.js?

Accepted Answer

To import and load external modules

Answer

To make HTTP requests

Answer

To parse JSON data

Answer

To create new objects

Question 7

Which of the following is a valid data type supported by Node.js?

Accepted Answer

Buffer

Answer

Structure

Answer

Pointer

Answer

Union

Question 8

What is the main purpose of the 'package.json' file in a Node.js project?

Accepted Answer

To store project metadata, dependencies, and scripts

Answer

To configure the application's security settings

Answer

To define the database configuration

Question 9

What is the main role of the Express.js framework in Node.js?

Accepted Answer

To provide routing and middleware capabilities

Answer

To generate HTML pages

Answer

To process user input

Answer

To handle database connectivity

Question 10

Which command is used to install Node.js modules?

Accepted Answer

npm install

Answer

gem install

Answer

pip install

Answer

yarn add

Question 11

What is the key difference between callbacks and promises in Node.js?

Accepted Answer

Promises allow asynchronous code to be written in a more synchronous style

Answer

Callbacks are more efficient than promises

Answer

Promises are exclusively used for error handling

Question 12

Which of the following best describes the architecture of Node.js?

Accepted Answer

Single-threaded, event-driven architecture with non-blocking I/O

Answer

Multi-threaded, asynchronous architecture with blocking I/O

Answer

Multi-threaded, event-driven architecture with blocking I/O

Question 13

What is the primary purpose of the Node.js REPL environment?

Accepted Answer

Interactive exploration of JavaScript code and debugging

Answer

Transpiling JavaScript code to other languages

Answer

Deploying production-ready web applications

Answer

Managing package dependencies

Question 14

Which of the following modules is used to perform HTTP requests and responses in Node.js?

Accepted Answer

http

Answer

request

Answer

fetch

Answer

ajax

Question 15

What is the purpose of the 'package.json' file in a Node.js project?

Accepted Answer

Store project metadata, define dependencies, scripts, and configuration

Answer

Configure specific server settings

Answer

Contain the main JavaScript application code

Answer

Manage user authentication and authorization

Question 16

Which of the following best describes a key feature of Express.js?

Accepted Answer

Provides a flexible routing system for web applications

Answer

Exclusively designed for developing static websites

Answer

Supports only MongoDB as the database

Answer

Enforces strict type checking in JavaScript code

Question 17

What is the recommended approach for handling errors in Node.js?

Accepted Answer

Utilizing 'try...catch' blocks for error handling

Answer

Ignoring errors and allowing the application to crash

Answer

Printing error messages to the console

Answer

Handling errors in global event listeners

Question 18

Which of the following is a key advantage of using MongoDB with Node.js?

Accepted Answer

Offers a dynamic, document-oriented data model

Answer

Provides support for traditional SQL queries

Answer

Incorporates built-in authentication and authorization mechanisms

Answer

Optimized for high performance with large datasets

Question 19

What is the primary purpose of the 'fs' module in Node.js?

Accepted Answer

Provides functions for file system operations, such as reading and writing files

Answer

Handles user input validation and sanitization

Answer

Parses and manipulates JSON data

Answer

Manages database connections and queries

Question 20

Which of the following is considered a best practice for writing scalable Node.js applications?

Accepted Answer

Employing asynchronous operations to avoid blocking the event loop

Answer

Establishing a limited number of database connections

Answer

Avoiding the use of caching mechanisms

Answer

Minimizing the usage of loops in code

Question 21

What is the primary function of the event loop in Node.js?

Accepted Answer

Processes asynchronous events, callbacks, and timers

Answer

Executes JavaScript code sequentially in a single thread

Answer

Provides a graphical user interface for applications

Answer

Manages memory allocation and garbage collection

Question 22

Which of the following is a core feature of Node.js?

Accepted Answer

Asynchronous programming

Answer

Real-time data processing

Answer

Multi-threading

Answer

Synchronous I/O

Question 23

What is the primary function of a package.json file in Node.js?

Accepted Answer

Store project metadata and manage dependencies

Answer

Configure the database settings

Answer

Handle user authentication

Answer

Define the application's routes

Question 24

Which of the following is a popular Node.js framework for building web applications?

Accepted Answer

Express

Answer

React Native

Answer

Angular

Answer

jQuery

Question 25

What is the primary purpose of using a templating engine in Node.js?

Accepted Answer

Generate dynamic HTML content

Answer

Validate user input

Answer

Handle database queries

Answer

Manage file uploads

Question 26

Which command is used to initialize a new Node.js project?

Accepted Answer

npm init

Answer

node create

Answer

touch package.json

Answer

mkdir node-project

Question 27

What is the key difference between synchronous and asynchronous code in Node.js?

Accepted Answer

Asynchronous code does not block the event loop, while synchronous code does.

Answer

Synchronous code is faster than asynchronous code.

Answer

Asynchronous code runs on multiple threads, while synchronous code runs on a single thread.

Question 28

Which of the following is a valid data type in Node.js?

Accepted Answer

Object

Answer

Struct

Answer

Record

Answer

Tuple

Question 29

What is the primary purpose of the 'fs' module in Node.js?

Accepted Answer

File system operations

Answer

User authentication

Answer

Network communication

Answer

Database connectivity

Question 30

Which of the following is a recommended practice for error handling in Node.js?

Accepted Answer

Utilizing try...catch blocks for error interception

Answer

Using global error handlers exclusively

Answer

Ignoring errors and letting the system handle them

Answer

Throwing errors without providing context

Question 31

What is the distinction between a module and a library in Node.js?

Accepted Answer

A module is a single file of reusable code, while a library is a collection of modules.

Answer

Modules are always dynamically loaded, while libraries are statically loaded.

Answer

Modules can only be used within the same project, unlike libraries.

Question 32

Which of the following is NOT a characteristic of Node.js?

Accepted Answer

Compiled into machine code

Answer

Cross-platform

Answer

Event-driven

Answer

Uses JavaScript as its programming language

Question 33

What is the primary role of the Node.js package manager (NPM)?

Accepted Answer

To manage JavaScript packages

Answer

To create new Node.js projects

Answer

To run Node.js applications

Answer

To compile Node.js code

Question 34

Which of the following is a core module in Node.js?

Accepted Answer

fs

Answer

math

Answer

react

Answer

jquery

Question 35

What is a key difference between synchronous and asynchronous functions in Node.js?

Accepted Answer

Synchronous functions block the event loop, while asynchronous functions do not.

Answer

Asynchronous functions are only used for input/output operations.

Answer

Synchronous functions are faster than asynchronous functions.

Question 36

Which of the following is an advantage of using Node.js for real-time applications?

Accepted Answer

Improved performance due to its event-driven architecture

Answer

Easier debugging

Answer

Reduced development time

Answer

Lower hosting costs

Question 37

What is the purpose of the 'require()' function in Node.js?

Accepted Answer

To import modules

Answer

To create new modules

Answer

To run external scripts

Answer

To export variables

Question 38

Which of the following is the correct syntax to create an HTTP server using Node.js?

Accepted Answer

const http = require('http'); const server = http.createServer();

Answer

const server = new Server();

Answer

const http = require('http'); const server = new http.Server();

Question 39

Which of the following best describes the role of the 'express' module in Node.js web development?

Accepted Answer

To provide a framework for building web applications

Answer

To enable user authentication

Answer

To handle database connectivity

Question 40

What is the main purpose of 'middleware' in Node.js web applications?

Accepted Answer

To handle requests and responses before they reach the main application code

Answer

To provide caching mechanisms

Answer

To enable user session management

Question 41

What is the main purpose of using Node.js?

Accepted Answer

To build server-side applications using JavaScript.

Answer

To manage databases for storing and retrieving data.

Answer

To create interactive user interfaces for websites.

Question 42

Which of these is NOT a core feature of Node.js?

Accepted Answer

Built-in tools for working with relational databases.

Answer

Handling lots of tasks at once without blocking.

Answer

Being lightweight and efficient for fast processing.

Answer

Using an event-driven architecture for responses.

Question 43

What is the role of the 'npm' package manager in Node.js?

Accepted Answer

It helps you install and manage external libraries (like code building blocks).

Answer

It deploys your Node.js applications to servers where they can run.

Answer

It transforms JavaScript code into instructions computers understand.

Question 44

How does the event-driven architecture work in Node.js?

Accepted Answer

The program responds to events as they happen, handling many tasks at the same time.

Answer

The program relies on a central control to manage and schedule tasks.

Answer

The program executes tasks one after another in a fixed order.

Question 45

What is the purpose of using 'require()' in your Node.js code?

Accepted Answer

To bring in external modules and libraries you want to use.

Answer

To create your own custom functions within your code.

Answer

To make new objects (like containers for data) in your code.

Question 46

When getting data from a server in a Node.js app, which HTTP method is usually used?

Accepted Answer

GET

Answer

DELETE

Answer

POST

Answer

PUT

Question 47

What does a 'callback function' do in Node.js?

Accepted Answer

It runs after a task that takes time (like fetching data) is finished.

Answer

It handles any input a user gives to your Node.js program.

Answer

It contains the main instructions and logic of your Node.js program.

Question 48

What's the main job of a 'server' object in Node.js?

Accepted Answer

It listens for requests from users and then handles those requests.

Answer

It creates the HTML content that users see in their web browsers.

Answer

It stores data permanently in a database for your application.

Question 49

What are some key advantages of choosing Node.js for web development?

Accepted Answer

It's fast, handles lots of users well, and has a large community for support.

Answer

It makes development super simple with minimal code and built-in databases.

Answer

It's known for top-notch security, robust error handling, and many front-end tools.