Data Representation MCQs
Data Representation MCQs
With Answers & Detailed Explanations
Class: 9 |
Subject: Computer Science |
Section: Data Representation & Number System |
Board: CBSE
Q1. Data representation in computers is done using:
Answer: B. Binary numbers
Computers understand only two states (ON/OFF), represented by 1 and 0. Therefore, all data is stored and processed in binary form.
Computers understand only two states (ON/OFF), represented by 1 and 0. Therefore, all data is stored and processed in binary form.
Q2. Binary number system uses base:
Answer: A. 2
Binary system has only two digits (0 and 1), so its base or radix is 2.
Binary system has only two digits (0 and 1), so its base or radix is 2.
Q3. Decimal number system base is:
Answer: C. 10
Decimal system uses digits 0–9, making its base 10.
Decimal system uses digits 0–9, making its base 10.
Q4. 1 Byte equals:
Answer: C. 8 bits
A byte is a group of 8 bits and is the basic unit for data storage.
A byte is a group of 8 bits and is the basic unit for data storage.
Q5. The smallest unit of data is:
Answer: B. Bit
Bit stands for Binary Digit and represents a single 0 or 1.
Bit stands for Binary Digit and represents a single 0 or 1.
Q6. A group of 4 bits is called:
Answer: B. Nibble
Four bits together form a nibble.
Four bits together form a nibble.
Q7. Octal number system base is:
Answer: B. 8
Octal system uses digits 0–7.
Octal system uses digits 0–7.
Q8. Hexadecimal system uses digits up to:
Answer: C. F
Hexadecimal uses 0–9 and A–F (total 16 digits).
Hexadecimal uses 0–9 and A–F (total 16 digits).
Q9. Binary equivalent of decimal 5 is:
Answer: A. 101
5 = 4 + 1 → Binary = 101.
5 = 4 + 1 → Binary = 101.
Q10. Decimal equivalent of binary 10 is:
Answer: B. 2
Binary 10 = (1×2¹) + (0×2⁰) = 2.
Binary 10 = (1×2¹) + (0×2⁰) = 2.
Q11. 1 Kilobyte equals:
Answer: B. 1024 bytes
Computer memory uses powers of 2 → 2¹⁰ = 1024.
Computer memory uses powers of 2 → 2¹⁰ = 1024.
Q12. ASCII stands for:
Answer: A
ASCII is used to represent characters in binary form.
ASCII is used to represent characters in binary form.
Q13. Binary of decimal 8 is:
Answer: A
8 = 2³ → 1000.
8 = 2³ → 1000.
Q14. Which system is closest to human counting?
Answer: B
Humans use digits 0–9 in daily life.
Humans use digits 0–9 in daily life.
Q15. Memory is measured in:
Answer: A
Storage capacity is measured in bits, bytes, KB, MB, etc.
Storage capacity is measured in bits, bytes, KB, MB, etc.
Q16. 1 MB equals:
Answer: A
1 MB = 1024 KB in computer memory.
1 MB = 1024 KB in computer memory.
Q17. Data stored in computer is in:
Answer: B
All forms convert to binary internally.
All forms convert to binary internally.
Q18. Hexadecimal base is:
Answer: D
Hexadecimal uses 16 symbols.
Hexadecimal uses 16 symbols.
Q19. Binary of decimal 1 is:
Answer: B
Decimal 1 equals binary 1.
Decimal 1 equals binary 1.
Q20. Which device processes binary data?
Answer: A
CPU processes all instructions in binary form.
CPU processes all instructions in binary form.
