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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outside the
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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IB/G/Jun25/7516/2
, 4
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outside the
Turn over ►
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IB/G/Jun25/7516/2
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
for more: tyrionpapers.com
IB/G/Jun25/7516/2
, 3
Do not write
outside the
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
for more: tyrionpapers.com
IB/G/Jun25/7516/2
, 4
Do not write
outside the
Turn over ►
for more: tyrionpapers.com
IB/G/Jun25/7516/2
