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Computer Science · May / June 2023 · Paper 12 · Question 3

0478

As printed in the paper

The question as text

When keys are pressed on a keyboard, the text is converted to binary to be processed by the computer.

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

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  • 3(a)[3]

    Any three from:

    A character set is used
    … such as Unicode/ASCII
    Each character has a unique binary value

  • 3(b)(i)[1]

    It reduces the file size

  • 3(b)(ii)[4]

    Any four from:

    A compression algorithm is used
    … such as RLE/run length encoding
    Repeating words/characters/phrases are identified // Patterns are identified
    … and indexed
    … with number of occurrences
    … with their position

  • 3(b)(iii)[2]

    Any two from:

    e.g.

    To save storage space
    To make it quicker to transmit
    To make it small enough to attach to an email
    To reduce the bandwidth needed to transmit
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