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

1. 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

2. What is Node.js primarily used for?

Front-end development

Database management

Server-side JavaScript

Mobile app development

3. How does garbage collection work in Node.js?

Node.js uses automatic garbage collection to reclaim memory occupied by unreferenced objects.

Garbage collection is not supported in Node.js applications.

Developers need to manually free up memory in Node.js applications.

Node.js relies on third-party libraries for garbage collection.

4. How can you perform unit testing in a Node.js application?

By using the 'assert' module that comes with Node.js.

By employing third-party testing frameworks such as 'Mocha' or 'Jest'.

By creating custom testing functions within the application.

All of the above.

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

node run app.js

start node app

npm start

run application

6. 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.

7. 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.

8. What is the difference between 'process.nextTick()' and 'setImmediate()' in Node.js?

'process.nextTick()' is used for scheduling callbacks to be executed in the next iteration of the event loop, while 'setImmediate()' is used for executing callbacks in the current iteration.

'setImmediate()' is used for scheduling callbacks to be executed in the next iteration of the event loop, while 'process.nextTick()' is used for executing callbacks in the current iteration.

There is no difference; both functions are used interchangeably in Node.js.

Both functions are deprecated in the latest versions of Node.js.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. What is the 'process.argv' property in Node.js?

It is used to access environment variables in a Node.js application.

It contains an array of command-line arguments passed to the Node.js process.

It represents the global object in Node.js.

It is a shorthand for 'argument vector' and is used to pass arguments to functions.

15. What does the term 'middleware' refer to in the context of Express.js?

Software for hardware communication

Modules for frontend styling

Functions that have access to the request and response objects

Data storage for applications

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

Handling file system operations

Managing front-end styles

Facilitating server communication

Filtering scripts

17. What is the 'require' function in Node.js used for?

To import external modules and make them available in the current module.

To define new functions within a module.

To create a new instance of a class.

To include CSS styles in a Node.js application.

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

Database management

Web application framework

Data encryption

User authentication

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

Handling HTTP requests

File system operations

Database connections

User authentication

20. How does Node.js handle concurrent requests?

Through the use of a single thread with an event loop

By creating a new thread for each request

By using multi-threading

By relying solely on synchronous code execution

21. How can you handle file uploads in a Node.js application?

By using the 'fs' module exclusively.

By sending files as JSON payloads in HTTP requests.

By utilizing middleware like 'multer' for processing file uploads.

By manually encoding files in Base64 format.

22. How can you handle errors in asynchronous functions in Node.js?

Using try-catch blocks

Using error callbacks

Using error events

Errors cannot be handled in asynchronous functions

23. Discuss the role of the 'jsonwebtoken' library in authentication for Node.js applications.

It is used for encrypting and decrypting database passwords.

It facilitates secure file uploads and downloads.

It is crucial for implementing OAuth 2.0.

It enables the creation and verification of JSON Web Tokens for user authentication.

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

Ctrl + C

Ctrl + Z

End Process command

Terminate() function

25. Explain the concept of 'npm scripts' and their significance in Node.js projects.

npm scripts are used for installing Node.js packages globally.

npm scripts define custom commands for various project tasks, enhancing automation and consistency.

npm scripts are solely for managing project documentation.

npm scripts are deprecated, and developers are encouraged to use alternative tools.

26. What is the role of the 'events' module in Node.js?

Managing server events

Handling user interactions

Generating random events

Creating event-driven applications

27. What is the purpose of the 'cluster' module in Node.js?

Creating clustered network architecture

Handling network requests

Managing server clusters

Cluster analysis of data

28. Explain the concept of middleware chaining in Express.js.

It refers to connecting multiple Express.js applications to form a chain of middleware functions.

It involves linking multiple middleware functions together in a specific order to process incoming requests.

It is a technique for chaining multiple routes in an Express.js application.

Middleware chaining is not applicable in Express.js.

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

Handling cryptocurrency transactions

Encryption and decryption

Web scraping

User authentication

30. 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.

31. 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.

32. 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.

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

npm install

node install

npm dependencies

install package

34. 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.

35. How does Node.js handle unhandled exceptions in applications?

By automatically restarting the application.

By logging the exception and continuing with normal execution.

By crashing the application to prevent further damage.

By notifying the developer through email alerts.

36. How can you handle authentication in a Node.js application?

Using the 'passport' middleware.

By encrypting user credentials with the 'bcrypt' library.

By implementing JSON Web Tokens (JWT).

All of the above.

37. 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

38. 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.

39. What is the purpose of the 'url' module in Node.js?

Handling Uniform Resource Locators

Creating URLs for web pages

Routing in web applications

Managing user authentication

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

Routing in web applications

Manipulating file paths

Creating HTTP servers

Handling database connections

41. 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.

42. How does the 'EventEmitter' class contribute to event handling in Node.js?

It is used for error handling in asynchronous operations.

It facilitates communication between parent and child processes.

It provides a mechanism for emitting and listening to events.

It manages file system events exclusively.

43. 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.

44. 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.

45. Which event is emitted when a new client connects to a Node.js server?

client.connect

server.connection

http.request

net.connection

46. Which package manager is commonly used with Node.js?

Maven

npm

NuGet

pip

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

log4js

console

debug

logging

48. What is the purpose of the 'dotenv' module in Node.js applications?

To encrypt sensitive data in configuration files.

To manage environment variables.

To compress and decompress files in the project.

To enable secure communication between server and client.

49. Explain the purpose of the 'cluster' module in Node.js.

To create clustered network architecture for improved performance and resilience.

To handle network requests in an Express.js application.

To manage server clusters during the development process.

To analyze data clusters in a Node.js application.

50. 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

Node.js MCQ Test 1