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Computer Science · Oct / Nov 2021 · Paper 11 · Question 4

0478

As printed in the paper

The question as text

Georgia is a wedding photographer. She wants to store 10 photographs on a USB flash memory drive for a customer. Each photograph is 100 pixels wide and 50 pixels high. The photographs are 8-bit colour photographs.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

  • 4(a)[3]

    Two marks for any two correct workings and one mark for the correct answer.

    Working:

    100 × 50 = 5000 bits
    5000 × 8 = 40,000 bits
    40,000 / 8 = 5,000 bytes
    5,000 × 10 = 50,000 bytes
    50,000 / 1024

    Answer:

    48.83 kB // 49 kB

    NOTE: Alternative correct methods of working can be credited. Answer can be given to any number of dp.

  • 4(b)[3]

    One mark per correct method, two marks per justification.

    Lossless
    Lossy would remove data permanently // lossless would not remove any data permanently // File could be restored to original …
    … that could affect the quality (lossy) // … to maintain the quality (lossless)

  • 4(c)[5]

    Light
    Lens
    Charge-coupled
    Analogue-to-digital
    Pixel
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