1 $Which JavaScript engine is Node.js built upon?$

A.

SpiderMonkey

B.

V8

C.

Chakra

D.

JavaScriptCore

2 $Which of the following best describes the nature of Node.js?$

A.

Multi-threaded and blocking

B.

Single-threaded and non-blocking

C.

Multi-threaded and non-blocking

D.

Single-threaded and blocking

3 $Who created Node.js?$

A.

Brendan Eich

B.

Ryan Dahl

C.

Jordan Walke

D.

Tim Berners-Lee

4 $What does REPL stand for in the context of Node.js?$

A.

Read Evaluate Process Loop

B.

Run Execute Print Loop

C.

Read Eval Print Loop

D.

Read Execute Process List

5 $Which command allows you to enter the Node.js REPL environment in a terminal?$

A.

npm start

B.

node

C.

repl

D.

js

6 $In the Node.js REPL, what does the underscore variable (_) represent?$

A.

The global scope

B.

The last evaluated result

C.

The current directory

D.

An undefined variable

7 $Which command is used to initialize a new Node.js project and create a package.json file?$

A.

npm install

B.

npm new

C.

npm start

D.

npm init

8 $Which flag can be used with 'npm init' to skip the questionnaire and use default values?$

A.

--skip

B.

-y

C.

--default

D.

-f

9 $Where does npm install the dependencies for a local project by default?$

A.

/usr/local/lib

B.

global_modules

C.

node_modules

D.

npm_packages

10 $Which file stores the metadata and dependency list for a Node.js project?$

A.

index.js

B.

package.json

C.

config.xml

D.

node_modules

11 $Which function is used to include modules in Node.js?$

A.

include()

B.

import()

C.

require()

D.

fetch()

12 $Which of the following is a Core Module in Node.js?$

A.

express

B.

fs

C.

lodash

D.

mongoose

13 $How do you export a function or object from a module in Node.js using CommonJS?$

A.

export default

B.

module.exports

C.

exports.module

D.

return module

14 $Which syntax is correct to import a local module located in the same directory?$

A.

require('moduleName')

B.

require('./moduleName')

C.

require('/moduleName')

D.

import moduleName

15 $What is the purpose of the 'events' module in Node.js?$

A.

To handle file operations

B.

To handle HTTP requests

C.

To handle and trigger events

D.

To stream data

16 $Which class is the primary component of the 'events' module?$

A.

EventDispatcher

B.

EventListener

C.

EventEmitter

D.

EventHandler

17 $Which method of EventEmitter is used to register a listener for an event?$

A.

emit()

B.

on()

C.

trigger()

D.

listen()

18 $Which method of EventEmitter causes an event to occur?$

A.

dispatch()

B.

emit()

C.

fire()

D.

call()

19 $What is a 'callback' in Node.js?$

A.

A blocking function

B.

A function passed as an argument to be executed later

C.

A global variable

D.

A recursive loop

20 $What is the convention for the first argument of a Node.js callback function?$

A.

The result data

B.

The configuration object

C.

The error object (or null)

D.

The callback function itself

21 $What is 'Callback Hell'?$

A.

A syntax error in callbacks

B.

Deeply nested callbacks making code hard to read

C.

When a callback never executes

D.

A security vulnerability

22 $Which method is used to read a file asynchronously in Node.js?$

A.

fs.read()

B.

fs.readFileSync()

C.

fs.readFile()

D.

fs.open()

23 $What happens if you use 'fs.writeFile()' on an existing file?$

A.

It throws an error

B.

It appends data to the end

C.

It replaces the file content

D.

It creates a backup copy

24 $Which 'fs' method is used to add data to a file without overwriting it?$

A.

fs.addFile()

B.

fs.writeAfter()

C.

fs.appendFile()

D.

fs.insert()

25 $How do you delete a file using the 'fs' module?$

A.

fs.delete()

B.

fs.remove()

C.

fs.unlink()

D.

fs.erase()

26 $Which method converts a JavaScript object into a JSON string?$

A.

JSON.parse()

B.

JSON.stringify()

C.

JSON.convert()

D.

JSON.toString()

27 $Which method parses a JSON string into a JavaScript object?$

A.

JSON.parse()

B.

JSON.stringify()

C.

JSON.decode()

D.

JSON.objectify()

28 $What is a Stream in Node.js?$

A.

A continuous flow of data handled piece by piece

B.

A database connection

C.

A large file stored in memory

D.

A static HTML page

29 $Which type of stream can generally be used to read data from a source?$

A.

Writable

B.

Readable

C.

Duplex

D.

Transform

30 $What is the purpose of the 'pipe()' method in streams?$

A.

To delete the stream

B.

To pause the stream

C.

To connect a readable stream to a writable stream

D.

To convert stream to buffer

31 $Which module allows you to work with file paths specifically?$

A.

fs

B.

path

C.

url

D.

http

32 $Which Node.js module provides compression and decompression functionality?$

A.

zip

B.

compress

C.

zlib

D.

crypto

33 $Which function creates a stream that compresses data using Gzip?$

A.

zlib.createGzip()

B.

zlib.gzip()

C.

zlib.compress()

D.

zlib.zip()

34 $What are the three states of a Promise?$

A.

Start, Stop, Pause

B.

Pending, Fulfilled, Rejected

C.

True, False, Null

D.

Running, Waiting, Dead

35 $Which method is used to handle the successful resolution of a Promise?$

A.

.catch()

B.

.finally()

C.

.then()

D.

.done()

36 $Which method is used to catch errors in a Promise chain?$

A.

.then()

B.

.catch()

C.

.error()

D.

.fail()

37 $What does the 'async' keyword do when placed before a function?$

A.

It makes the function run in a separate thread

B.

It ensures the function returns a Promise

C.

It pauses the event loop

D.

It makes the function synchronous

38 $The 'await' keyword can only be used inside which type of function?$

A.

Any function

B.

Synchronous functions

C.

async functions

D.

Callback functions

39 $What is the benefit of using async/await over callbacks?$

A.

It runs faster

B.

It creates multi-threading

C.

It writes asynchronous code that looks synchronous and is easier to read

D.

It bypasses the V8 engine

40 $What is the global object in Node.js equivalent to 'window' in browsers?$

A.

root

B.

global

C.

process

D.

document

41 $Which global variable holds the directory name of the current module?$

A.

__filename

B.

__dirname

C.

process.cwd()

D.

module.path

42 $Which method checks if a file exists in Node.js (Modern approach)?$

A.

fs.exists()

B.

fs.access()

C.

fs.check()

D.

fs.validate()

43 $What is a 'Duplex' stream?$

A.

A stream that can only read

B.

A stream that can only write

C.

A stream that can both read and write

D.

A stream that compresses data

44 $What is the file extension typically used for a file containing CommonJS module code?$

A.

.json

B.

.js

C.

.mjs

D.

.ts

45 $How can you install a package globally using npm?$

A.

npm install package --all

B.

npm install package -g

C.

npm global install package

D.

npm add package global

46 $What does 'npm' stand for?$

A.

Node Process Manager

B.

Node Project Manager

C.

Node Package Manager

D.

New Package Module

47 $When using 'fs.createReadStream', which event is fired when the file is completely read?$

A.

done

B.

finish

C.

end

D.

close

48 $In a Promise, what happens if you return a value in a .then() block?$

A.

The value is ignored

B.

The next .then() receives it as a resolved value

C.

It throws an error

D.

The promise chain stops

49 $What is the main advantage of Streams over reading files into memory?$

A.

Streams are synchronous

B.

Streams use less memory (memory efficiency)

C.

Streams sort data automatically

D.

Streams encrypt data automatically

50 $Which core module allows you to create a web server?$

A.

fs

B.

url

C.

http

D.

net

Unit 1 - Practice Quiz