Top 20 Tech Interview Questions (MCQs) for FAANG & IT Companies

Prepare for top tech company interviews with this set of 50 important Multiple Choice Questions (MCQs) covering data structures, algorithms, OOP, databases, networking, cloud computing, DevOps, and web development.

Each question provides four options, and the correct answer is revealed instantly when selected. This quiz is ideal for students and professionals preparing for FAANG, product-based companies, and IT placements.

Test your technical knowledge and aim for a perfect 50/50 score!

1. What is the time complexity of binary search?

A) O(log n)

B) O(n)

C) O(n log n)

D) O(1)

2. Which data structure follows FIFO?

A) Queue

B) Stack

C) Tree

D) Graph

3. What does SQL stand for?

A) Structured Query Language

B) Simple Query Language

C) Sequential Query Language

D) Standard Query Logic

4. Which sorting algorithm has O(n log n) average time?

A) Merge Sort

B) Bubble Sort

C) Selection Sort

D) Linear Search

5. What is the default port of HTTP?

A) 80

B) 443

C) 22

D) 21

6. Which language is mainly used for Android development?

A) Java

B) Swift

C) Python

D) Kotlin Script

7. What does API stand for?

A) Application Programming Interface

B) Advanced Programming Internet

C) Application Process Integration

D) Automated Program Interface

8. Which database is NoSQL?

A) MongoDB

B) MySQL

C) Oracle

D) PostgreSQL

9. Git is used for?

A) Version Control

B) Database

C) Cloud Hosting

D) Debugging

10. Secure version of HTTP is?

A) HTTPS

B) FTP

C) TCP

D) UDP

11. What is the average time complexity of Quick Sort?

A) O(n log n)

B) O(n²)

C) O(n)

D) O(log n)

12. Which keyword is used for inheritance in Java?

A) extends

B) implement

C) inherit

D) super

13. React is mainly used for?

A) Building UI

B) Database

C) Server Hosting

D) Operating System

14. Which data structure uses LIFO?

A) Stack

B) Queue

C) Tree

D) Graph

15. DNS stands for?

A) Domain Name System

B) Data Name Server

C) Dynamic Network Service

D) Digital Naming System

16. TypeScript was developed by?

A) Microsoft

B) Google

C) Facebook

D) Amazon

17. Docker is mainly used for?

A) Containerization

B) Database

C) UI Design

D) Operating System

18. Default port of HTTPS?

A) 443

B) 80

C) 21

D) 22

19. Big-O notation is used for?

A) Time Complexity

B) Memory Storage

C) Network Speed

D) CPU Power

20. CSS is used for?

A) Styling Web Pages

B) Database

C) Server

D) Programming Backend