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Computer Science · May / June 2025 · Paper 12 · Question 1

0478

As printed in the paper

The question as text

A computer stores data temporarily in random access memory (RAM).

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

Show the answer and mark scheme

  • 1(a)[1]

    Any one from:

    ROM
    Cache

  • 1(b)[1]

    Any one from:

    It is volatile storage // Data is lost when the power is turned off.
    It needs to be regularly replaced by other data // The data regularly changes // Data needs to be constantly updated

  • 1(c)[2]

    10011
    11100110

  • 1(d)[2]

    0011 0101
    1000 1010 1101

  • 1(e)[3]

    One mark for each correct nibble (MAX 2)

    One mark for a correct method of working e.g. showing carries.

    1 1

    0 1 1 0 0 1 0 1

    0 1 1 1 0 0 0 0

    1 1 0 1 0 1 0 1

  • 1(f)[2]

    Any two from:

    The result is greater than 255 // The result is too large.
    Cannot be stored in 8 bits // Cannot be stored in the number of bits available for the register

  • 1(g)[2]

    One mark for a correct working method e.g. flip and add

    One mark for correct answer

    11101010

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