1 What is Node.js?
a) A web framework
b) A JavaScript runtime built on Chrome's V8 JavaScript engine
c) A front-end library
d) An operating system
Answer: b) A JavaScript runtime built on Chrome's V8 JavaScript engine
2. Which programming language is Node.js primarily based on?
a) Python
b) JavaScript
c) Ruby
d) PHP
Answer: b) JavaScript
3. What is the purpose of the 'npm' in Node.js?
a) Node Package Manager
b) Network Protocol Module
c) New Project Manager
d) Node Project Maker
Answer: a) Node Package Manager
4. What is a callback function in Node.js?
a) A function that is executed in a loop
b) A function passed as an argument to another function, to be executed after some asynchronous operation is completed
c) A function that has a timeout
d) A function that performs encryption
Answer: b) A function passed as an argument to another function, to be executed after some asynchronous operation is completed
5. Which core module is used for creating a server in Node.js?
a) fs
b) http
c) url
d) path
Answer: b) http
6. What is the role of the 'require' function in Node.js?
a) To include external modules
b) To define a new variable
c) To create a new function
d) To declare a new class
Answer: a) To include external modules
7. Which event is emitted when an error occurs in Node.js streams?
a) 'data'
b) 'end'
c) 'error'
d) 'close'
Answer: c) 'error'
8. What is the purpose of the 'os' module in Node.js?
a) To work with files and directories
b) To interact with the operating system
c) To handle network operations
d) To manipulate strings
Answer: b) To interact with the operating system
9. Which module in Node.js is used for handling file I/O operations?
a) fs
b) http
c) path
d) url
Answer: a) fs
10. What does 'npm init' do?
a) Installs a new package
b) Initializes a new Node.js project
c) Upgrades Node.js to the latest version
d) Uninstalls a package
Answer: b) Initializes a new Node.js project
11. Which method is used to listen for incoming requests in an HTTP server in Node.js?
a) start()
b) listen()
c) run()
d) open()
Answer: b) listen()
12. What is the purpose of the 'path' module in Node.js?
a) To handle HTTP requests
b) To manipulate file paths
c) To create a new server
d) To perform mathematical operations
Answer: b) To manipulate file paths
13. In Node.js, what does 'process.nextTick()' do?
a) Runs a function after a specific delay
b) Executes a function in the next event loop iteration
c) Terminates the current process
d) Logs a message to the console
Answer: b) Executes a function in the next event loop iteration
14. Which of the following is a non-blocking event-driven I/O model in Node.js?
a) Synchronous I/O
b) Asynchronous I/O
c) Blocking I/O
d) Parallel I/O
Answer: b) Asynchronous I/O
15. What is the purpose of the 'cluster' module in Node.js?
a) To create child processes
b) To handle network communication
c) To manage cluster of servers
d) To parse JSON data
Answer: c) To manage a cluster of servers
16. Which HTTP method is used for updating an existing resource in a RESTful API?
a) GET
b) POST
c) PUT
d) DELETE
Answer: c) PUT
17. In Node.js, what does 'event emitter' refer to?
a) A core module for handling events
b) A function that emits HTTP requests
c) A design pattern for handling events
d) A method to emit errors
Answer: c) A design pattern for handling events
18. Which module is used for implementing a WebSocket server in Node.js?
a) ws
b) http
c) socket
d) io
Answer: a) ws
19. What does 'npm install -g' do?
a) Installs a package globally
b) Installs a package locally
c) Uninstalls a package globally
d) Updates a package
Answer: a) Installs a package globally
20. In Node.js, what does 'req' refer to in the context of an HTTP server?
a) Request object
b) Response object
c) Redirect object
d) Requested URL
Answer: a) Request object
21. Which module is used for managing and handling cookies in Node.js?
a) http
b) cookie-parser
c) express
d) url
Answer: b) cookie-parser
22. What is the purpose of the 'child_process' module in Node.js?
a) To handle child-related events
b) To manage child processes
c) To create child elements in the DOM
d) To communicate with the parent process
Answer: b) To manage child processes
23. What is the event loop in Node.js?
a) A loop that handles HTTP requests
b) A loop that runs functions sequentially
c) A loop that processes events and callbacks
d) A loop that iterates through an array
Answer: c) A loop that processes events and callbacks
24. Which HTTP status code represents a successful response?
a) 200
b) 400
c) 500
d) 300
Answer: a) 200
25. What is a middleware in the context of a Node.js web application?
a) A function that runs before the server starts
b) A function that processes the request and response objects
c) A function that runs after the server starts
d) A function that validates the server configuration
Answer: b) A function that processes the request and response objects
26. Which module is used for managing asynchronous control flow in Node.js?
a) async
b) control-flow
c) flow-control
d) async-control
Answer: a) async
27. In Node.js, what does 'JSON' stand for?
a) JavaScript Object Notation
b) JavaScript Object Network
c) JavaScript Object Name
d) JavaScript Object Node
Answer: a) JavaScript Object Notation
28. What is the purpose of the 'url' module in Node.js?
a) To parse URL strings
b) To create new URLs
c) To handle HTTP requests
d) To encode and decode strings
Answer: a) To parse URL strings
29. Which module is commonly used for unit testing in Node.js applications?
a) mocha
b) jest
c) test-runner
d) unit-test
Answer: a) mocha
30. What is the purpose of the 'Buffer' class in Node.js?
a) To handle file I/O operations
b) To manipulate text data
c) To handle binary data
d) To encrypt and decrypt data
Answer: c) To handle binary data
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