Web Technologies MCQs with answers are essential for computer science students, frontend/backend developers, and competitive exam preparation (PPSC, FPSC, NTS). If you are looking for reliable Web Technologies MCQs, this comprehensive set of Web Technologies MCQs covers HTML5, CSS3, JavaScript, HTTP status codes, JSON, and REST APIs. Mastering these Web Technologies MCQs helps build core web development skills and achieve high test scores in every exam.

Table of Contents

Part 1: Web Technologies MCQs

  • A) <header>
  • B) <nav>
  • C) <section>
  • D) <aside>

Correct Answer: B) <nav>

Question 2: Which CSS3 property creates 1D responsive flexible layouts?

  • A) Display: Grid
  • B) Display: Flex
  • C) Position: Absolute
  • D) Float: Left

Correct Answer: B) Display: Flex
Note: Learn more foundational concepts by practicing more Web Technologies MCQs alongside our guide on Data Mining & Data Warehousing MCQs.

Question 3: Which JS keyword creates a block-scoped re-assignable variable?

  • A) var
  • B) const
  • C) let
  • D) static

Correct Answer: C) let

Question 4: What represents HTML elements as an object tree for JS manipulation?

  • A) Cookies
  • B) DOM
  • C) Engine
  • D) Sockets

Correct Answer: B) DOM

Question 5: Which CSS property controls element stacking order along Z-axis?

  • A) order
  • B) z-index
  • C) position
  • D) display

Correct Answer: B) z-index

Question 6: Which HTML attribute makes a field mandatory before form submit?

  • A) validate
  • B) required
  • C) important
  • D) mandatory

Correct Answer: B) required

Question 7: Which CSS layout module provides a 2D grid-based structure?

  • A) Flexbox
  • B) CSS Grid
  • C) Box Model
  • D) Columns

Correct Answer: B) CSS Grid

Question 8: Which JavaScript function parses a JSON string into an object?

  • A) JSON.stringify()
  • B) JSON.parse()
  • C) JSON.toObject()
  • D) JSON.convert()

Correct Answer: B) JSON.parse()

Question 9: What handles asynchronous execution in JavaScript without blocking UI?

  • A) Event Loop
  • B) Call Stack
  • C) Garbage Collector
  • D) Web Worker

Correct Answer: A) Event Loop

Question 10: Which HTML5 tag embeds vector graphics directly in web pages?

  • A) <canvas>
  • B) <svg>
  • C) <img>
  • D) <picture>

Correct Answer: B) <svg>

Question 11: Which legacy object handled AJAX requests before Fetch API?

  • A) FetchObject
  • B) XMLHttpRequest
  • C) HttpStream
  • D) Axios

Correct Answer: B) XMLHttpRequest

Question 12: Which CSS unit is relative to the root <html> font size?

  • A) em
  • B) rem
  • C) px
  • D) vh

Correct Answer: B) rem

Question 13: Which method attaches an event handler to an HTML element in JS?

  • A) attachEvent()
  • B) addEventListener()
  • C) listenEvent()
  • D) bindEvent()

Correct Answer: B) addEventListener()

Question 14: Which Web Storage API persists data with no expiration time?

  • A) sessionStorage
  • B) localStorage
  • C) Cookies
  • D) IndexedDB

Correct Answer: B) localStorage

Question 15: Which CSS pseudo-class selects an element on mouse hover?

  • A) :active
  • B) :hover
  • C) :focus
  • D) :visited

Correct Answer: B) :hover

Question 16: What is the default display value for <div> elements?

  • A) inline
  • B) block
  • C) inline-block
  • D) flex

Correct Answer: B) block

Question 17: Which JS array method returns a filtered array based on a condition?

  • A) map()
  • B) filter()
  • C) reduce()
  • D) forEach()

Correct Answer: B) filter()

Question 18: Which protocol secures web traffic using TLS/SSL encryption?

  • A) HTTP
  • B) HTTPS
  • C) FTP
  • D) SSH

Correct Answer: B) HTTPS

Question 19: What JS feature gives inner functions access to outer scope variables?

  • A) Callback
  • B) Closure
  • C) Promise
  • D) Generator

Correct Answer: B) Closure

Question 20: Which script attribute downloads JS asynchronously while parsing HTML?

  • A) defer
  • B) async
  • C) preload
  • D) module

Correct Answer: B) async

Question 21: Which browser security restricts cross-domain requests?

  • A) CSRF
  • B) Same-Origin Policy (SOP)
  • C) XSS
  • D) CSP

Correct Answer: B) Same-Origin Policy (SOP)

Question 22: Which HTML attribute provides alt text for images?

  • A) title
  • B) alt
  • C) src
  • D) description

Correct Answer: B) alt

Question 23: What JS object represents eventual completion of an async operation?

  • A) Callback
  • B) Promise
  • C) Event
  • D) Observable

Correct Answer: B) Promise

Question 24: Which HTTP header specifies the payload MIME type?

  • A) Accept
  • B) Content-Type
  • C) Authorization
  • D) User-Agent

Correct Answer: B) Content-Type

Question 25: Which CSS property clears floated elements?

  • A) display
  • B) clear
  • C) float
  • D) overflow

Correct Answer: B) clear

Part 2: REST APIs MCQs

Question 26: What does REST stand for in web service architecture?

  • A) Remote Enterprise Server Transfer
  • B) Representational State Transfer
  • C) Real-time Execution Socket Transport
  • D) Resource State Transmission

Correct Answer: B) Representational State Transfer

Question 27: Which HTTP method replaces an existing resource completely?

  • A) POST
  • B) PUT
  • C) PATCH
  • D) GET

Correct Answer: B) PUT

Question 28: Which HTTP method applies partial updates to a resource?

  • A) PUT
  • B) PATCH
  • C) POST
  • D) UPDATE

Correct Answer: B) PATCH

Question 29: Which HTTP status code indicates resource creation success?

  • A) 200 OK
  • B) 201 Created
  • C) 204 No Content
  • D) 301 Moved Permanently

Correct Answer: B) 201 Created

Question 30: Which HTTP status code represents unauthenticated access?

  • A) 400 Bad Request
  • B) 401 Unauthorized
  • C) 403 Forbidden
  • D) 404 Not Found

Correct Answer: B) 401 Unauthorized

Question 31: Which HTTP status code indicates server refusal despite authentication?

  • A) 401 Unauthorized
  • B) 403 Forbidden
  • C) 404 Not Found
  • D) 405 Method Not Allowed

Correct Answer: B) 403 Forbidden

Question 32: What term describes methods that yield identical results on repeated calls?

  • A) Stateless
  • B) Idempotent
  • C) Cacheable
  • D) Asynchronous

Correct Answer: B) Idempotent

Question 33: Which HTTP method is NOT idempotent in REST design?

  • A) GET
  • B) POST
  • C) PUT
  • D) DELETE

Correct Answer: B) POST

Question 34: What data format is most commonly used in REST APIs?

  • A) XML
  • B) JSON
  • C) YAML
  • D) HTML

Correct Answer: B) JSON

Question 35: Which header mechanism allows cross-domain browser requests?

  • A) CSP
  • B) CORS
  • C) JWT
  • D) HTTPS

Correct Answer: B) CORS

Question 36: Which token format consists of Header, Payload, and Signature?

  • A) OAuth 2.0
  • B) JWT
  • C) API Key
  • D) Session Cookie

Correct Answer: B) JWT

Question 37: Which REST rule ensures servers don’t store client session state?

  • A) Layered System
  • B) Statelessness
  • C) Cacheability
  • D) Uniform Interface

Correct Answer: B) Statelessness

Question 38: Which HTTP status code represents an Internal Server Error?

  • A) 400
  • B) 500
  • C) 502
  • D) 503

Correct Answer: B) 500

Question 39: Which HTTP status code represents a missing resource URL?

  • A) 400 Bad Request
  • B) 404 Not Found
  • C) 408 Request Timeout
  • D) 504 Gateway Timeout

Correct Answer: B) 404 Not Found

Question 40: What URL point is accessed by client applications to fetch data?

  • A) Payload
  • B) Endpoint
  • C) Socket
  • D) Proxy

Correct Answer: B) Endpoint

Question 41: Which HTTP method fetches resource data without altering server state?

  • A) POST
  • B) GET
  • C) DELETE
  • D) PUT

Correct Answer: B) GET

Question 42: Which protocol grants third-party app access without sharing passwords?

  • A) JWT
  • B) OAuth 2.0
  • C) Basic Auth
  • D) SAML

Correct Answer: B) OAuth 2.0

Question 43: Which HTTP status code indicates API rate limit exhaustion?

  • A) 400
  • B) 429 Too Many Requests
  • C) 503 Service Unavailable
  • D) 408 Request Timeout

Correct Answer: B) 429 Too Many Requests

  • A) Level 0
  • B) Level 3
  • C) Level 1
  • D) Level 2

Correct Answer: B) Level 3

Question 45: Which HTTP header passes authorization tokens like Bearer <token>?

  • A) Accept
  • B) Authorization
  • C) Cookie
  • D) Host

Correct Answer: B) Authorization

Question 46: Which HTTP method deletes a specified resource?

  • A) PUT
  • B) DELETE
  • C) REMOVE
  • D) PURGE

Correct Answer: B) DELETE

Question 47: Which status code indicates success with an empty response body?

  • A) 200 OK
  • B) 204 No Content
  • C) 201 Created
  • D) 302 Found

Correct Answer: B) 204 No Content

Question 48: Which protocol provides full-duplex communication over single TCP?

  • A) REST
  • B) WebSockets
  • C) gRPC
  • D) SOAP

Correct Answer: B) WebSockets

Question 49: Which REST property lets clients cache server responses locally?

  • A) Stateless
  • B) Cacheability
  • C) Code on Demand
  • D) Uniform Interface

Correct Answer: B) Cacheability

Question 50: Which web service architecture relies on XML and strict WSDL?

  • A) GraphQL
  • B) SOAP
  • C) WebSockets
  • D) gRPC

Correct Answer: B) SOAP

Conclusion

Mastering these Web Technologies MCQs builds practical web development and API integration skills. Practicing these Web Technologies MCQs regularly ensures you fully understand HTML5, CSS3, JavaScript, HTTP status codes, REST rules, and JWT auth, helping you secure top scores in exams and technical interviews through these Web Technologies MCQs.

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