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

A.

JavaScriptCore

B.

SpiderMonkey

C.

Chakra

D.

V8

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

A.

Multi-threaded and non-blocking

B.

Multi-threaded and blocking

C.

Single-threaded and blocking

D.

Single-threaded and non-blocking

3 $Who created Node.js?$

A.

Ryan Dahl

B.

Tim Berners-Lee

C.

Jordan Walke

D.

Brendan Eich

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

A.

Read Evaluate Process Loop

B.

Read Execute Process List

C.

Run Execute Print Loop

D.

Read Eval Print Loop

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

A.

node

B.

js

C.

npm start

D.

repl

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

A.

The current directory

B.

The last evaluated result

C.

The global scope

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 start

C.

npm init

D.

npm new

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

A.

--skip

B.

-f

C.

-y

D.

--default

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

A.

node_modules

B.

global_modules

C.

npm_packages

D.

/usr/local/lib

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.

fetch()

D.

require()

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

A.

fs

B.

lodash

C.

mongoose

D.

express

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

A.

exports.module

B.

return module

C.

module.exports

D.

export default

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 stream data

B.

To handle and trigger events

C.

To handle file operations

D.

To handle HTTP requests

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

A.

EventEmitter

B.

EventListener

C.

EventHandler

D.

EventDispatcher

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.

fire()

B.

dispatch()

C.

call()

D.

emit()

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.readFileSync()

B.

fs.read()

C.

fs.open()

D.

fs.readFile()

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

A.

It replaces the file content

B.

It appends data to the end

C.

It throws an error

D.

It creates a backup copy

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

A.

fs.appendFile()

B.

fs.writeAfter()

C.

fs.insert()

D.

fs.addFile()

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.toString()

B.

JSON.stringify()

C.

JSON.parse()

D.

JSON.convert()

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

A.

JSON.stringify()

B.

JSON.decode()

C.

JSON.objectify()

D.

JSON.parse()

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

A.

A database connection

B.

A static HTML page

C.

A continuous flow of data handled piece by piece

D.

A large file stored in memory

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

A.

Duplex

B.

Readable

C.

Writable

D.

Transform

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

A.

To connect a readable stream to a writable stream

B.

To convert stream to buffer

C.

To delete the stream

D.

To pause the stream

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

A.

url

B.

path

C.

fs

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.compress()

B.

zlib.zip()

C.

zlib.gzip()

D.

zlib.createGzip()

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

A.

Running, Waiting, Dead

B.

Start, Stop, Pause

C.

True, False, Null

D.

Pending, Fulfilled, Rejected

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

A.

.finally()

B.

.catch()

C.

.then()

D.

.done()

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

A.

.then()

B.

.fail()

C.

.catch()

D.

.error()

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

A.

It ensures the function returns a Promise

B.

It pauses the event loop

C.

It makes the function run in a separate thread

D.

It makes the function synchronous

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

A.

Synchronous functions

B.

Callback functions

C.

Any function

D.

async functions

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

A.

It runs faster

B.

It bypasses the V8 engine

C.

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

D.

It creates multi-threading

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

A.

root

B.

process

C.

global

D.

document

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

A.

__dirname

B.

process.cwd()

C.

module.path

D.

__filename

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

A.

fs.access()

B.

fs.check()

C.

fs.validate()

D.

fs.exists()

43 $What is a 'Duplex' stream?$

A.

A stream that can both read and write

B.

A stream that can only read

C.

A stream that compresses data

D.

A stream that can only write

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

A.

.js

B.

.mjs

C.

.json

D.

.ts

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

A.

npm install package -g

B.

npm add package global

C.

npm install package --all

D.

npm global install package

46 $What does 'npm' stand for?$

A.

Node Process Manager

B.

New Package Module

C.

Node Package Manager

D.

Node Project Manager

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

A.

close

B.

done

C.

finish

D.

end

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

A.

It throws an error

B.

The value is ignored

C.

The promise chain stops

D.

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

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

A.

Streams sort data automatically

B.

Streams encrypt data automatically

C.

Streams use less memory (memory efficiency)

D.

Streams are synchronous

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

A.

http

B.

url

C.

fs

D.

net

Unit 1 - Practice Quiz