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

A.

V8

B.

JavaScriptCore

C.

SpiderMonkey

D.

Chakra

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

A.

Multi-threaded and blocking

B.

Single-threaded and blocking

C.

Multi-threaded and non-blocking

D.

Single-threaded and non-blocking

3 $Who created Node.js?$

A.

Tim Berners-Lee

B.

Jordan Walke

C.

Ryan Dahl

D.

Brendan Eich

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

A.

Read Eval Print Loop

B.

Read Execute Process List

C.

Run Execute Print Loop

D.

Read Evaluate Process Loop

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

A.

repl

B.

npm start

C.

js

D.

node

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

A.

The last evaluated result

B.

The current directory

C.

An undefined variable

D.

The global scope

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

A.

npm new

B.

npm init

C.

npm start

D.

npm install

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

A.

-f

B.

-y

C.

--skip

D.

--default

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

A.

/usr/local/lib

B.

node_modules

C.

global_modules

D.

npm_packages

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

A.

package.json

B.

node_modules

C.

config.xml

D.

index.js

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

A.

require()

B.

import()

C.

fetch()

D.

include()

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

A.

lodash

B.

mongoose

C.

fs

D.

express

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

A.

module.exports

B.

export default

C.

return module

D.

exports.module

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

A.

import moduleName

B.

require('/moduleName')

C.

require('moduleName')

D.

require('./moduleName')

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

A.

To handle and trigger events

B.

To handle file operations

C.

To handle HTTP requests

D.

To stream data

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

A.

EventHandler

B.

EventDispatcher

C.

EventListener

D.

EventEmitter

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

A.

emit()

B.

trigger()

C.

on()

D.

listen()

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

A.

call()

B.

dispatch()

C.

fire()

D.

emit()

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

A.

A function passed as an argument to be executed later

B.

A global variable

C.

A blocking function

D.

A recursive loop

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

A.

The error object (or null)

B.

The result data

C.

The callback function itself

D.

The configuration object

21 $What is 'Callback Hell'?$

A.

Deeply nested callbacks making code hard to read

B.

When a callback never executes

C.

A security vulnerability

D.

A syntax error in callbacks

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

A.

fs.readFileSync()

B.

fs.open()

C.

fs.read()

D.

fs.readFile()

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

A.

It replaces the file content

B.

It throws an error

C.

It creates a backup copy

D.

It appends data to the end

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

A.

fs.appendFile()

B.

fs.writeAfter()

C.

fs.addFile()

D.

fs.insert()

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

A.

fs.remove()

B.

fs.unlink()

C.

fs.delete()

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.objectify()

D.

JSON.decode()

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

A.

A static HTML page

B.

A large file stored in memory

C.

A continuous flow of data handled piece by piece

D.

A database connection

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

A.

Duplex

B.

Readable

C.

Transform

D.

Writable

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

A.

To delete the stream

B.

To convert stream to buffer

C.

To connect a readable stream to a writable stream

D.

To pause the stream

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

A.

fs

B.

url

C.

path

D.

http

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

A.

crypto

B.

zlib

C.

compress

D.

zip

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

A.

zlib.gzip()

B.

zlib.createGzip()

C.

zlib.compress()

D.

zlib.zip()

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

A.

Pending, Fulfilled, Rejected

B.

Running, Waiting, Dead

C.

Start, Stop, Pause

D.

True, False, Null

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

A.

.catch()

B.

.then()

C.

.done()

D.

.finally()

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

A.

.catch()

B.

.fail()

C.

.error()

D.

.then()

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

A.

It pauses the event loop

B.

It ensures the function returns a Promise

C.

It makes the function synchronous

D.

It makes the function run in a separate thread

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

A.

Synchronous functions

B.

async functions

C.

Callback functions

D.

Any function

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.

document

B.

root

C.

process

D.

global

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

A.

process.cwd()

B.

module.path

C.

__dirname

D.

__filename

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

A.

fs.exists()

B.

fs.check()

C.

fs.validate()

D.

fs.access()

43 $What is a 'Duplex' stream?$

A.

A stream that compresses data

B.

A stream that can only write

C.

A stream that can only read

D.

A stream that can both read and write

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 global install package

B.

npm install package -g

C.

npm add package global

D.

npm install package --all

46 $What does 'npm' stand for?$

A.

Node Project Manager

B.

Node Package Manager

C.

Node Process Manager

D.

New Package Module

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

A.

done

B.

end

C.

finish

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.

The promise chain stops

D.

It throws an error

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.

http

C.

net

D.

url

Unit 1 - Practice Quiz