Lesson T3.2.1

T3.2.1 Representing numbers in binary Quiz: KS3 Computing, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T3.2.1, Representing numbers in binary: 20 multiple choice questions for the KS3 Computing (National Curriculum), Unit 3: Boolean logic and binary, written with Revision Ninja.

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The 20 questions

  1. What number system uses only the digits 0 and 1?

    • Hexadecimal
    • Binary
    • Decimal
    • Roman

  2. What is the decimal value of the binary number 101?

    • 3
    • 6
    • 101
    • 5

  3. What is 1111 in decimal?

    • 16
    • 11
    • 15
    • 4

  4. How many different values can 4 bits represent?

    • 4
    • 8
    • 16
    • 15

  5. What is the decimal value of 00001000?

    • 1
    • 10
    • 8
    • 1000

  6. What is the largest value that an 8-bit unsigned binary number can hold?

    • 256
    • 128
    • 1023
    • 255

  7. What are the place values of the bits in an 8-bit binary number from left to right?

    • 100, 50, 25, 12, 6, 3, 1, 0
    • 128, 64, 32, 16, 8, 4, 2, 1
    • 8, 16, 24, 32, 40, 48, 56, 64
    • 1, 2, 4, 8, 16, 32, 64, 128

  8. What is 10000000 in decimal?

    • 256
    • 64
    • 128
    • 1

  9. Which binary number represents the decimal value 6?

    • 1001
    • 101
    • 110
    • 111

  10. Which binary number represents the decimal value 9?

    • 1100
    • 1010
    • 1001
    • 0111

  11. What is the binary number 1010 in decimal?

    • 10
    • 8
    • 12
    • 5

  12. A pupil is storing the number 3 in binary using 4 bits. Which pattern is correct?

    • 1100
    • 0011
    • 0101
    • 0110

  13. Why do computers use binary?

    • Binary is easier for humans to write than any other number system
    • Binary removes the need for any memory
    • Electronic circuits can easily represent two states, on and off
    • Binary is the only system that can represent letters

  14. What is a bit?

    • A group of eight bytes stored together
    • A unit that measures screen brightness
    • A single binary digit, either 0 or 1
    • A letter typed on a keyboard

  15. What is the decimal value of 11110000?

    • 224
    • 15
    • 240
    • 128

  16. Which binary number is the decimal value 12?

    • 1001
    • 1100
    • 1110
    • 1011

  17. What is 00000001 in decimal?

    • 1
    • 10
    • 0
    • 2

  18. A byte has how many bits?

    • 8
    • 10
    • 4
    • 16

  19. What is the decimal value of the binary number 10?

    • 10
    • 0
    • 2
    • 1

  20. What is the decimal value of the binary number 111?

    • 7
    • 5
    • 8
    • 3

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