Lesson 4.5.3.1

4.5.3.1 Bits and bytes Quiz: AQA Computer Science, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.5.3.1, Bits and bytes: 20 multiple choice questions for the AQA Computer Science (7517), Unit 5: Fundamentals of data representation, written with Revision Ninja.

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The 20 questions

  1. How many bits are in a byte?

    • 10
    • 16
    • 4
    • 8

  2. What is a bit?

    • A decimal digit from 0 to 9
    • A group of eight bytes stored together
    • A binary digit that is either 0 or 1
    • A unit that measures processor speed

  3. How many different values can be represented with n bits?

    • n x 8
    • n^2
    • 2n
    • 2^n

  4. Which is the fundamental unit of information?

    • The kilobyte
    • The 16-bit word
    • The byte
    • The bit

  5. How many different patterns can 3 bits be configured in?

    • 3
    • 8
    • 6
    • 9

  6. How many bytes are in 1 KiB?

    • 512 bytes
    • 2048 bytes
    • 1024 bytes
    • 1000 bytes

  7. What does the decimal prefix 'kilo' mean in the specification?

    • 10^6, which is one million
    • 10^3, which is 1000
    • 2^20, which is 1048576
    • 2^10, which is 1024

  8. How many bytes are in 2 KiB?

    • 1024
    • 4096
    • 2048
    • 2000

  9. How many bytes are in 1 MB when M is the decimal prefix?

    • 1,048,576 bytes
    • 1,000,000 bytes
    • 1,024 bytes
    • 10,000 bytes

  10. How many bits are in 5 bytes?

    • 50
    • 13
    • 40
    • 5

  11. A file is 3,072 bytes in size. How many KiB is this?

    • 3 KiB
    • 3,000 KiB
    • 30 KiB
    • 3.5 KiB

  12. How many bits are needed to store 300 different values?

    • 10
    • 9
    • 300
    • 8

  13. How many distinct values can 6 bits represent?

    • 32
    • 12
    • 36
    • 64

  14. How many gibibytes is 8,589,934,592 bytes?

    • 1 GiB
    • 64 GiB
    • 8 GiB
    • 16 GiB

  15. How many bytes are in 1 TiB, using the binary prefix tebi?

    • 10^12 bytes
    • 2^40 bytes
    • 10^9 bytes
    • 2^30 bytes

  16. What is the minimum number of bits needed to store one million distinct values?

    • 19
    • 10
    • 20
    • 24

  17. Why does a kibibyte differ from a kilobyte?

    • A kibibyte is 1024 bytes, a power of 2, whereas a kilobyte is 1000 bytes, a power of 10
    • They are identical in size, and the names differ only in how they are spelled out in text
    • A kibibyte is 1000 bytes, while a kilobyte is 1024 bytes, which is the common convention
    • A kibibyte has 8 bits and a kilobyte has 10 bits, so the two units differ in number of bits

  18. A 16-bit unsigned integer can store how many distinct values?

    • 32,768
    • 65,536
    • 16,384
    • 16

  19. Which of these is larger: 500 GB with decimal prefixes, or 500 GiB with binary prefixes?

    • 500 GiB, because 500 x 2^30 bytes exceeds 500 x 10^9 bytes
    • 500 GB, because a gibibyte has fewer bytes than a gigabyte
    • 500 GB, because decimal prefixes are always larger
    • They are the same size, since the prefixes differ only in notation

  20. How many bits are in 1 MiB?

    • 8,000,000 bits
    • 1,000,000 bits
    • 1,048,576 bits
    • 8,388,608 bits

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