ACTUAL 2025 AQA AS COMPUTER SCIENCE Paper 2 Question Paper & Mark Scheme (Merged) Monday 19 May 2025 [VERIFIED]

ACTUAL 2025 AQA AS COMPUTER SCIENCE Paper 2
Question Paper & Mark Scheme (Merged) Monday 19 May 2025 [VERIFIED]

, 2
Do not write
outside the

Answer all questions in the spaces provided. box


0 1 . 1 Which two of the numbers below belong to the set of numbers represented by ℤ?

Shade two lozenges.
[2 marks]


A 0



B √2

C π
3
D
4
E 998



0 1 . 2 Describe what is meant by the term ‘ordinal number’.
[1 mark]




0 1 .



3 Explain why real numbers are better suited to representing measurements of some
quantities than natural numbers.
[1 mark]




4




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, 3
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0 2 . 1 How many different values can be represented using one byte? box
[1 mark]




0 2 . 2 The bit pattern in Figure 1 represents an 8-bit unsigned binary integer.

Figure 1


0 1 0 0 0 0 1 1


Convert the bit pattern in Figure 1 to decimal.
[1 mark]




0 2 . 3 Show how the 8-bit unsigned binary number 01001111can be added to the 8-bit
unsigned binary number 00001011without converting the numbers into decimal.

You must show all your working in binary.
[2 marks]

01001111
+00001011


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Turn over ►




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