Lesson 1.2.3

1.2.3 Units Quiz: OCR Computer Science, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 1.2.3, Units: 20 multiple choice questions for the OCR GCSE Computer Science (J277), Unit 2: Memory and storage, written with Revision Ninja.

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The 20 questions

  1. How many bits are in a nibble?

    • 2
    • 8
    • 4
    • 16

  2. How many bits are in a byte?

    • 10
    • 4
    • 8
    • 16

  3. Under this specification, how many kilobytes (KB) are in one megabyte (MB)?

    • 10,000 KB
    • 100 KB
    • 1,000 KB
    • 1,000,000 KB

  4. How many gigabytes (GB) are in one terabyte (TB)?

    • 100 GB
    • 10 GB
    • 1,000 GB
    • 10,000 GB

  5. What is a byte?

    • A group of 8 bits
    • A group of 4 bits
    • A group of 16 bits
    • A single binary digit

  6. Which of these is the largest unit of data storage?

    • Megabyte
    • Terabyte
    • Petabyte
    • Gigabyte

  7. Why must computers store all data in binary format?

    • Faster printing
    • Two-state circuits
    • Easier translation
    • Smaller file sizes

  8. What is the name for a single binary digit of either 0 or 1?

    • Byte
    • Pixel
    • Bit
    • Nibble

  9. A sound file has a sample rate of 8000 Hz, a duration of 2 seconds and a bit depth of 8. What is its size in bits?

    • 16,000 bits
    • 64,000 bits
    • 1,280,000 bits
    • 128,000 bits

  10. An image is 800 x 600 pixels with a colour depth of 24 bits. What is its size in bits?

    • 480,000 bits
    • 1,440,000 bits
    • 11,520,000 bits
    • 115,200 bits

  11. A text file has 500 characters stored at 8 bits per character. What is its size in bits?

    • 500 bits
    • 4,000 bits
    • 400 bits
    • 40,000 bits

  12. How many kilobytes are in 2,000 bytes?

    • 16 KB
    • 20 KB
    • 0.2 KB
    • 2 KB

  13. A file is 2.5 GB in size. How many megabytes is this?

    • 2,500,000 MB
    • 2,500 MB
    • 250 MB
    • 25,000 MB

  14. Forty photos are each 5 MB. How much storage do they need in total?

    • 200 MB
    • 8 MB
    • 2,000 MB
    • 45 MB

  15. If an image's colour depth is doubled with no other changes, what happens to file size?

    • Halves
    • Quadruples
    • Doubles
    • Unchanged

  16. What happens to a sound file's size if its sample rate is doubled?

    • It halves
    • It doubles
    • Stays the same
    • It quadruples

  17. A drive has a capacity of 2 TB. How many GB is this under this specification's units?

    • 20,000 GB
    • 2,000 GB
    • 2,000,000 GB
    • 200 GB

  18. A 16-bit sound recording lasts 10 seconds at a sample rate of 1,000 Hz. What is its size in bits?

    • 16,000 bits
    • 1,600,000 bits
    • 1,600 bits
    • 160,000 bits

  19. Roughly how many megabytes is a 1920 x 1080 image at 24-bit colour, using 1 MB = 1,000 KB and 1 KB = 1,000 bytes?

    • 6.2 MB
    • 62 MB
    • 0.6 MB
    • 24.9 MB

  20. Why might file metadata affect total calculated file size?

    • Adds extra details
    • Compresses the file
    • Removes header info
    • Changes file type

All OCR Computer Science quizzes