Question Paper
Class / Subject: Class 8 (ICSE) · Computer Applications
Chapter: Chapter 1 — Chapter 1: Number Systems (Detailed)
Time Allowed: 32 minutes
Max Marks: 16
1. What digits does binary use? [1]
(A) 0 and 1
(B) 0 to 9
(C) A to Z
(D) 1 to 10
2. What base is binary? [1]
(A) Base-2
(B) Base-10
(C) Base-16
(D) Base-8
3. What base is our normal decimal system? [1]
(A) Base-10
(B) Base-2
(C) Base-16
(D) Base-8
4. What is binary 101 in decimal? [1]
(A) 5
(B) 10
(C) 101
(D) 3
5. What is binary 110 in decimal? [1]
(A) 6
(B) 3
(C) 11
(D) 110
6. How do we convert decimal to binary? [1]
(A) Repeatedly divide by 2, track remainders
(B) Multiply by 10 repeatedly
(C) Add 2 repeatedly
(D) Subtract 1 repeatedly
7. Why do computers use binary? [1]
(A) It matches electronic on/off states
(B) It's easier for humans
(C) It has more digits
(D) No specific reason
8. Why learn binary-decimal conversion? [1]
(A) To understand how computers represent numbers
(B) No reason
(C) It's not useful
(D) Only for tests
9. What base is hexadecimal? [1]
(A) Base-16
(B) Base-10
(C) Base-2
(D) Base-8
10. What symbols does hexadecimal use? [1]
(A) 0-9 and A-F
(B) Only 0-9
(C) Only A-F
(D) 0-9 and G-Z
11. What value does hexadecimal 'A' represent? [1]
(A) 10
(B) 1
(C) 0
(D) 11
12. What value does hexadecimal 'F' represent? [1]
(A) 15
(B) 6
(C) 5
(D) 16
13. How many binary bits does one hex digit represent? [1]
(A) 4
(B) 2
(C) 8
(D) 16
14. Where is hexadecimal commonly used? [1]
(A) Web colours and memory addresses
(B) Only in cooking
(C) Only in sports
(D) Nowhere useful
15. What is #FF0000 an example of? [1]
(A) A hex colour code for red
(B) A binary number
(C) A decimal number
(D) A type of file
16. Why learn about hexadecimal? [1]
(A) To see how computers represent complex information compactly
(B) No reason
(C) It's not useful
(D) Only for tests