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Computer Science · Oct / Nov 2025 · Paper 12 · Question 1

0478

As printed in the paper

The question as text

A toy store gives each of the toys it sells a unique code. The codes are 3-digit hexadecimal codes, for example A4B. A computer is used to store a database of the codes. The computer has 12-bit registers.

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

Show the answer and mark scheme

  • 1(a)[1]

    FFF

  • 1(b)[1]

    4095

  • 1(c)[2]

    0100 0010 1001

    0001 1010 0011

  • 1(d)[2]

    8A1

    70B

  • 1(e)(i)[1]

    Microprocessor

  • 1(e)(ii)[1]

    A

  • 1(e)(iii)[1]

    Light

  • 1(e)(iv)[4]

    Any four from:

    The disk is spun
    A laser is shone onto the disk
    Pits are burnt into the disk
    Pits are in a (spiral) track
    Pits and lands represent binary values
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