Learn Node Js MCQs
Prepare Node Js MCQs (Multiple choice Questions) for exam and job interviews.
What is the `app.listen()` method used for in Express.js?
1) To start the server and listen for incoming requests
2) To define routes
3) To handle middleware
4) To manage sessions
Answer : Option 1
How do you ensure that your Node.js application is scalable?
1) By using clustering and load balancing
2) By optimizing synchronous code
3) By using single-threaded processes
4) By limiting the number of requests
Answer : Option 1
What does the `fs.readFileSync()` method do?
1) Reads the entire file contents synchronously
2) Reads the file asynchronously
3) Creates a readable stream
4) Opens a file
Answer : Option 1
How do you use the `http` module to make an HTTP request?
1) By using `http.request()`
2) By using `http.get()`
3) By using `http.createServer()`
4) By using `http.send()`
Answer : Option 1
What is the role of the `process.argv` array in Node.js?
1) To handle command-line arguments
2) To manage environment variables
3) To handle HTTP requests
4) To read files
Answer : Option 1
How do you handle authentication in a Node.js application?
1) Using authentication middleware like Passport
2) Using custom authentication code
3) Using `http` module
4) Using `fs` module
Answer : Option 1
What does the `url.format()` method do?
1) Formats a URL object into a URL string
2) Parses a URL string into an object
3) Handles HTTP requests
4) Manages file systems
Answer : Option 1
How do you define and use environment variables in a Node.js application?
1) By using `.env` files and `dotenv` package
2) By hardcoding values in code
3) By using `config` module
4) By setting system environment variables
Answer : Option 1
What is the purpose of the `crypto` module in Node.js?
1) To provide cryptographic functionality
2) To handle HTTP requests
3) To manage file systems
4) To parse URLs
Answer : Option 1
How do you handle real-time communication in Node.js?
1) Using WebSockets or libraries like Socket.io
2) Using HTTP requests
3) Using file system operations
4) Using standard input/output
Answer : Option 1