Challenging Node Js Test - 78+ MCQs: Node.js test: Evaluate Your Expertise with Node.js Questions and Answers

1. What is the event loop in Node.js, and how does it work?

It manages asynchronous operations by using a single-threaded, non-blocking event loop.

It is a loop that iterates through arrays of events in a program.

It handles CPU-intensive tasks by parallelizing them across multiple threads.

It is an error-handling mechanism in Node.js applications.

2. How can you include external modules in Node.js?

Using the import statement

Through the require function

With the include directive

By importing from the global namespace

3. Which command is used to start a Node.js application?

node run app.js

start node app

npm start

run application

4. Which Node.js method is used to read environment variables?

process.env()

readEnv()

getEnv()

envRead()

5. In Node.js, how can you handle query parameters in a URL?

Using the 'body' property

Using the 'query' property

Using the 'params' property

Query parameters are not supported in Node.js

6. Discuss the role of the 'Cluster' module in Node.js and its benefits.

It manages multiple Node.js applications simultaneously.

It enables parallel processing of tasks within a single Node.js instance.

It handles clustering of servers for improved performance and reliability.

It provides a visual representation of the application's performance.

7. Examine the purpose of the 'module.exports' object in Node.js.

To export functions and variables from a module

To import modules in the global scope

To manage asynchronous operations

To execute code in a child process

8. Which HTTP method is used for updating a resource in a Node.js RESTful API?

GET

POST

PUT

DELETE

9. What is the significance of the 'Buffer' class in Node.js?

It is used for file input/output operations.

It handles networking functionalities.

It represents raw binary data.

It is part of the error-handling mechanism.

10. What is the purpose of the 'express' module in Node.js?

Database management

Web application framework

Data encryption

User authentication

11. What is the purpose of the 'stream' module in Node.js?

Streaming media content

Handling file streams

Streamlining database queries

Managing network streams

12. What is the purpose of the 'os' module in Node.js?

To manage operating system processes in a Node.js application.

To optimize system performance through resource allocation.

To create custom operating systems using Node.js.

To gather information about the operating system environment.

13. What is Node.js commonly used for?

Client-side scripting

Database management

Server-side JavaScript

Graphic design

14. How does error handling differ in synchronous and asynchronous code in Node.js?

In synchronous code, errors are typically handled using try-catch blocks, while in asynchronous code, errors are handled using callbacks or promises.

Error handling is the same in both synchronous and asynchronous code.

In synchronous code, errors are automatically caught by the event loop, while in asynchronous code, developers need to manually catch errors.

Error handling is not supported in Node.js applications.

15. Which module is commonly used for logging in Node.js applications?

log4js

console

debug

logging

16. Which command is used to install dependencies specified in 'package.json' in Node.js?

npm install

node install

npm dependencies

install package

17. What is the main purpose of the 'require' function in Node.js?

To include external modules

To declare variables

To define functions

To handle exceptions

18. Explain the concept of 'streaming' in Node.js and its applications.

Streaming refers to playing audio and video files in a web browser.

It is the process of continuously transferring data in chunks, enhancing efficiency and reducing memory usage.

Streaming is applicable only to file system operations.

It is the mechanism for handling user authentication in real-time.

19. Which event is emitted when an unhandled exception occurs in Node.js?

process.exception

unhandledException

error.unhandled

exception.error

20. Examine the role of the 'WebSocket' protocol in Node.js and its applications.

It is used for handling HTTP requests and responses.

It facilitates real-time, bidirectional communication between clients and servers.

It is exclusive to secure connections using HTTPS.

It is designed for handling file uploads and downloads only.

Node.js MCQ Test 4