Computer Science MCQS

Computer Science MCQ with detailed explanations for students & freshers preparing for entrance exams, various tests, interviews, competitive exams like GATE exam, interview, competitive examination and entrance exam.

Which SQL command is used to delete all records from a table without deleting the table structure?

A. DROP
B. TRUNCATE
C. DELETE
D. REMOVE
Correct answer is: B. TRUNCATE

Which component is known as the “Brain” of the computer?

A. RAM
B. CPU
C. Motherboard
D. BIOS
Correct answer is: B. CPU

The ‘ACID’ property in DBMS stands for Atomicity, Consistency, Isolation, and:

A. Data
B. Durability
C. Database
D. Degree
Correct answer is: B. Durability

1 Terabyte (TB) is equal to:

A. 1024 MB
B. 1024 GB
C. 1000 GB
D. 1024 KB
Correct answer is: B. 1024 GB

Which of the following is a NoSQL database?

A. MySQL
B. Oracle
C. MongoDB
D. PostgreSQL
Correct answer is: C. MongoDB

Which memory is non-volatile?

A. RAM
B. ROM
C. Cache
D. Registers
Correct answer is: B. ROM

A ‘Join’ operation in SQL combines:

A. Columns
B. Rows from two or more tables
C. Databases
D. Files
Correct answer is: B. Rows from two or more tables

ASCII stands for:

A. American Standard Code for Information Interchange
B. Asian Standard Code for Information Interchange
C. American Scientific Code for Interchange
D. All Standard Code for Information
Correct answer is: A. American Standard Code for Information Interchange

Normalization is used to:

A. Increase Speed
B. Reduce Data Redundancy
C. Encrypt Data
D. Backup Data
Correct answer is: B. Reduce Data Redundancy

Which is the fastest memory in a computer?

A. RAM
B. Hard Disk
C. Registers
D. SSD
Correct answer is: C. Registers
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