Number System Class 8 MCQs with Answers
Number System โ MCQs with Answers & Explanations
Class: 8
Subject: Computer Science
Section: Number System
Topic: Number System MCQs with Answers
Board: CBSE (Based on NCERT Examination Pattern)
Subject: Computer Science
Section: Number System
Topic: Number System MCQs with Answers
Board: CBSE (Based on NCERT Examination Pattern)
1. The number system used by computers is:
Answer: B
Explanation: Computers understand only two digits (0 and 1), called Binary.
Explanation: Computers understand only two digits (0 and 1), called Binary.
2. Binary number uses base:
Answer: A
Explanation: Binary is base-2 because it uses only two digits.
Explanation: Binary is base-2 because it uses only two digits.
3. Decimal system base is:
Answer: C
Explanation: Decimal uses digits 0โ9, so base is 10.
Explanation: Decimal uses digits 0โ9, so base is 10.
4. Octal number system base is:
Answer: B
Explanation: Octal uses digits 0โ7.
Explanation: Octal uses digits 0โ7.
5. Hexadecimal system base is:
Answer: D
Explanation: Hexadecimal uses 16 symbols (0โ9, AโF).
Explanation: Hexadecimal uses 16 symbols (0โ9, AโF).
6. Binary of decimal 5 is:
Answer: A
Explanation: 5 = 4 + 1 โ 101.
Explanation: 5 = 4 + 1 โ 101.
7. Decimal of binary 10 is:
Answer: B
Explanation: 1ร2ยน = 2.
Explanation: 1ร2ยน = 2.
8. Smallest binary digit is:
Answer: A
Explanation: Bit = Binary Digit.
Explanation: Bit = Binary Digit.
9. 8 bits make:
Answer: B
Explanation: 1 Byte = 8 Bits.
Explanation: 1 Byte = 8 Bits.
10. Binary of 1 is:
Answer: B
Explanation: Decimal 1 equals binary 1.
Explanation: Decimal 1 equals binary 1.
11. Binary digits are called:
Answer: B
Explanation: Binary digits = Bits.
Explanation: Binary digits = Bits.
12. Decimal 8 in binary:
Answer: A
Explanation: 8 = 2ยณ โ 1000.
Explanation: 8 = 2ยณ โ 1000.
13. Hexadecimal uses letters up to:
Answer: C
Explanation: AโF represent 10โ15.
Explanation: AโF represent 10โ15.
14. 1 Nibble equals:
Answer: B
Explanation: 1 Nibble = 4 Bits.
Explanation: 1 Nibble = 4 Bits.
15. Decimal 3 in binary:
Answer: B
Explanation: 3 = 2 + 1 โ 11.
Explanation: 3 = 2 + 1 โ 11.
16. Binary addition 1+1 =
Answer: B
Explanation: 1+1 = 10 (0 carry 1).
Explanation: 1+1 = 10 (0 carry 1).
17. Computer memory is measured in:
Answer: B
Explanation: Storage units are Bytes, KB, MB etc.
Explanation: Storage units are Bytes, KB, MB etc.
18. Binary 0 represents:
Answer: B
Explanation: 0 = OFF state in digital electronics.
Explanation: 0 = OFF state in digital electronics.
19. Decimal 2 in binary:
Answer: A
Explanation: 2 = 2ยน โ 10.
Explanation: 2 = 2ยน โ 10.
20. Which number system is human-friendly?
Answer: B
Explanation: Humans use Decimal in daily life.
Explanation: Humans use Decimal in daily life.
