Important Computer Science MCQs (Exam Oriented)
1. Which data structure follows LIFO principle?
A) Queue B) Stack C) Array D) Tree
Answer: Stack
2. Time complexity of binary search is:
A) O(n) B) O(log n) C) O(n log n) D) O(1)
Answer: O(log n)
3. Which is not an operating system?
A) Linux B) Windows C) Oracle D) macOS
Answer: Oracle
4. Which SQL command removes all records but keeps structure?
A) DELETE B) DROP C) TRUNCATE D) REMOVE
Answer: TRUNCATE
5. Which OOP concept binds data and methods together?
A) Inheritance B) Polymorphism C) Abstraction D) Encapsulation
Answer: Encapsulation
6. Which protocol is used for sending emails?
A) FTP B) SMTP C) HTTP D) POP3
Answer: SMTP
7. Which of the following is volatile memory?
A) ROM B) SSD C) Hard Disk D) RAM
Answer: RAM
8. Which language is used for web page structure?
A) Python B) Java C) HTML D) C++
Answer: HTML
9. Which software model is linear and sequential?
A) Agile B) Spiral C) Waterfall D) RAD
Answer: Waterfall
10. Which device connects different networks?
A) Switch B) Hub C) Router D) Repeater
Answer: Router
11. Which sorting algorithm is fastest on average?
A) Bubble B) Insertion C) Quick Sort D) Selection
Answer: Quick Sort
12. What does CPU stand for?
A) Central Processing Unit B) Control Processing Unit C) Central Program Unit D) Core Processing
Unit
Answer: Central Processing Unit
13. Which topology uses a central device?
A) Ring B) Bus C) Star D) Mesh
Answer: Star
14. Which key uniquely identifies a record in DB?
A) Foreign Key B) Primary Key C) Candidate Key D) Alternate Key
Answer: Primary Key
15. Which layer of OSI handles encryption?
A) Network B) Transport C) Session D) Presentation
Answer: Presentation
