INT222 Unit 1: Getting Started with Node.JS & Handling Data I/O in Node.js - MCQ Practice | B. Tech. CSE

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

A.

JavaScriptCore

B.

V8

C.

SpiderMonkey

D.

Chakra

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

A.

Single-threaded and blocking

B.

Multi-threaded and non-blocking

C.

Single-threaded and non-blocking

D.

Multi-threaded and 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 Execute Process List

B.

Read Eval Print Loop

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.

js

B.

repl

C.

node

D.

npm start

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 start

B.

npm new

C.

npm init

D.

npm install

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

A.

--skip

B.

--default

C.

-f

D.

-y

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.

config.xml

B.

package.json

C.

index.js

D.

node_modules

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

A.

fetch()

B.

require()

C.

import()

D.

include()

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

A.

lodash

B.

fs

C.

express

D.

mongoose

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

A.

return module

B.

export default

C.

module.exports

D.

exports.module

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

A.

require('moduleName')

B.

require('./moduleName')

C.

import moduleName

D.

require('/moduleName')

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

A.

To handle file operations

B.

To handle and trigger events

C.

To stream data

D.

To handle HTTP requests

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

A.

EventEmitter

B.

EventDispatcher

C.

EventHandler

D.

EventListener

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

A.

emit()

B.

trigger()

C.

listen()

D.

on()

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

A.

call()

B.

emit()

C.

dispatch()

D.

fire()

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 result data

B.

The error object (or null)

C.

The configuration object

D.

The callback function itself

21 $What is 'Callback Hell'?$

A.

A security vulnerability

B.

Deeply nested callbacks making code hard to read

C.

When a callback never executes

D.

A syntax error in callbacks

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

A.

fs.read()

B.

fs.readFileSync()

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 creates a backup copy

C.

It appends data to the end

D.

It throws an error

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

A.

fs.appendFile()

B.

fs.insert()

C.

fs.writeAfter()

D.

fs.addFile()

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.stringify()

B.

JSON.toString()

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 large file stored in memory

C.

A static HTML page

D.

A continuous flow of data handled piece by piece

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

A.

Readable

B.

Transform

C.

Duplex

D.

Writable

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

A.

To connect a readable stream to a writable stream

B.

To delete the stream

C.

To convert stream to buffer

D.

To pause the stream

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.

crypto

B.

compress

C.

zlib

D.

zip

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

A.

zlib.compress()

B.

zlib.gzip()

C.

zlib.createGzip()

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.

.then()

B.

.finally()

C.

.catch()

D.

.done()

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

A.

.error()

B.

.then()

C.

.catch()

D.

.fail()

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

A.

It ensures the function returns a Promise

B.

It makes the function synchronous

C.

It makes the function run in a separate thread

D.

It pauses the event loop

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 writes asynchronous code that looks synchronous and is easier to read

C.

It creates multi-threading

D.

It bypasses the V8 engine

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

A.

process

B.

root

C.

global

D.

document

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

A.

process.cwd()

B.

__filename

C.

__dirname

D.

module.path

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

A.

fs.exists()

B.

fs.validate()

C.

fs.access()

D.

fs.check()

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.

.ts

B.

.mjs

C.

.json

D.

.js

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.

New Package Module

B.

Node Package Manager

C.

Node Project Manager

D.

Node Process Manager

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

A.

close

B.

done

C.

end

D.

finish

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

A.

The promise chain stops

B.

It throws an error

C.

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

D.

The value is ignored

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

A.

Streams encrypt data automatically

B.

Streams sort 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.

net

B.

http

C.

url

D.

fs

Unit 1: Getting Started with Node.JS & Handling Data I/O in Node.js - Practice Quiz

Did this save you a night before the exam?