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

1. 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.

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

node run app.js

start node app

npm start

run application

3. 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.

4. 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.

5. 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.

6. 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.

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

Ctrl + C

Ctrl + Z

End Process command

Terminate() function

8. 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.

9. What is the purpose of the 'querystring' module in Node.js?

To handle database queries in an Express.js application.

To parse and stringify URL query strings.

To create dynamic queries in a Node.js application.

To manage query parameters in HTTP requests.

10. Which version of JavaScript does Node.js support?

ES5

ES6

ES7

ES8

Node.js MCQ Test 5