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

1. What are the benefits of using the 'Express' framework in Node.js development?

It simplifies the creation of static websites only.

It provides a minimalistic approach to web development.

It offers a robust set of features for building scalable and maintainable web applications.

It is recommended only for small-scale projects.

2. 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.

3. What is the role of the 'fs.promises' module in Node.js?

To handle file system operations using promises instead of callbacks.

To manage front-end styles in a Node.js application.

To create HTTP servers with promises.

To facilitate communication between different parts of a Node.js application.

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

Handling file system operations

Managing front-end styles

Facilitating server communication

Filtering scripts

5. Explain the concept of 'middleware' in the context of Express.js.

It refers to software that mediates communication between hardware components.

Middleware in Express.js are functions that have access to the request and response objects and can modify them.

It is a technique for handling errors in Express.js applications.

Middleware is not used in Express.js.

6. 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

7. What is the purpose of the 'Buffer' class in Node.js?

To handle file uploads in an Express.js application.

To store binary data directly in memory.

To manage database queries.

To control the flow of data in a stream.

8. What is the purpose of the 'pm2' process manager in Node.js applications?

To manage project documentation.

To handle routing in Express applications.

To ensure continuous monitoring and automatic restarts of Node.js processes.

To synchronize data between multiple databases.

9. How can you handle session management in an Express.js application?

By using the 'express-session' middleware.

By storing session data in cookies.

By implementing custom session management functions.

All of the above.

10. What is Node.js commonly used for?

Client-side scripting

Database management

Server-side JavaScript

Graphic design

11. What is the role of npm in Node.js development?

To manage and install packages/modules

To create graphical user interfaces

To handle HTTP requests

To execute SQL queries

12. Explain the event loop in the context of Node.js.

It manages asynchronous operations and callbacks.

It handles user interface events in the browser.

It executes synchronous code sequentially.

It is used for database connections only.

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

process.env()

readEnv()

getEnv()

envRead()

14. How can you handle file uploads in an Express.js application?

By using the 'express-upload' middleware.

By including the 'multipart/form-data' content type in the form.

By manually parsing the request body in the route handler.

All of the above.

15. How can you secure your Express.js application against common security threats?

By using HTTPS for secure communication.

By implementing middleware for handling security headers.

By validating and sanitizing user input.

All of the above.

16. What is the purpose of the 'async' and 'await' keywords in Node.js?

To manage asynchronous operations using callbacks.

To define asynchronous functions.

To handle exceptions in asynchronous code.

To simplify asynchronous code and make it more readable and maintainable.

17. In Node.js, how can you handle file uploads in a web application?

Using the 'upload' module

Using 'express-fileupload' middleware

File uploads are not supported in Node.js

Handling file uploads is done automatically

18. How does Node.js handle memory management?

It relies on the garbage collector for automatic memory management.

It requires developers to manually allocate and deallocate memory.

It uses a combination of automatic memory management and manual memory control.

It doesn't manage memory; it delegates this task to the operating system.

19. What is the purpose of the 'middleware' in Express.js?

To define routes in an Express.js application.

To handle static files such as images and styles.

To manage database connections.

To execute functions with access to the request and response objects during the request-response cycle.

20. How can you terminate a Node.js process?

Ctrl + C

Ctrl + Z

End Process command

Terminate() function

21. What is the purpose of the 'crypto' module in Node.js?

Handling cryptocurrency transactions

Encryption and decryption

Web scraping

User authentication

22. 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

23. What is the purpose of the 'vm' module in Node.js?

To handle virtual memory in a Node.js application.

To create and run scripts in isolated environments.

To manage view models in an Express.js application.

To validate modules before importing them.

24. 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

25. What is the role of the 'path' module in Node.js?

Routing in web applications

Manipulating file paths

Creating HTTP servers

Handling database connections

26. Differentiate between 'process.nextTick()' and 'setImmediate()' in Node.js.

'process.nextTick()' executes callback functions in the current event loop cycle, while 'setImmediate()' executes them in the next cycle.

'setImmediate()' is used for file system operations, whereas 'process.nextTick()' is for network-related tasks.

'setImmediate()' is deprecated in Node.js, and 'process.nextTick()' is the recommended alternative.

'process.nextTick()' is asynchronous, and 'setImmediate()' is synchronous.

27. Explain the concept of 'callback hell' and how it can be mitigated in Node.js.

It is the simultaneous execution of multiple callbacks, and it can be mitigated by using asynchronous functions.

It is the nesting of callbacks, and it can be addressed by using promises or async/await.

It refers to a bug in the event loop, and it can be resolved by updating Node.js to the latest version.

It is the absence of callback functions, and it can be resolved by enabling strict mode.

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

node run app.js

start node app

npm start

run application

29. What is the significance of the 'Promisify' utility in Node.js development?

It converts synchronous functions into asynchronous ones.

It is used for creating promises in JavaScript.

It is part of the 'util' module for handling utilities.

It simplifies error handling in asynchronous code.

30. 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.

Node.js MCQ Test 3