AQA A-level COMPUTER SCIENCE Paper 2 QUESTION PAPER 2021A-level
COMPUTER SCIENCE
Paper 2
AQA A-level COMPUTER SCIENCE Paper 2 QP 20212
*02* IB/G/Jun21/7517/2
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0 1
...
AQA A-level COMPUTER SCIENCE Paper 2 QUESTION PAPER 2021A-level
COMPUTER SCIENCE
Paper 2
AQA A-level COMPUTER SCIENCE Paper 2 QP 20212
*02* IB/G/Jun21/7517/2
Do not write
outside the
Answer all questions. box
0 1 . 1 A bitmap image is 1000 pixels wide by 800 pixels high.
The image takes up 400 kB of storage space when represented as a bitmap,
excluding metadata.
Calculate the maximum number of different colours that could appear in the image.
You should show your working.
[3 marks]
Answer3
*03*
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8
0 1 . 2 The same image can also be represented using vector graphics.
The vector graphics representation of the image takes up 2 kB of storage space.
Explain why the amount of storage space taken up by the vector graphics
representation of the image is significantly smaller than the space taken up by the
bitmap representation.
[3 marks]
0 1 . 3 One advantage of vector graphics compared to bitmap graphics is that fewer bytes
are used to represent an image.
State two other advantages of vector graphics compared with bitmap graphics.
[2 marks]
Advantage 1
Advantage 2
Turn over for the next question4
*04* IB/G/Jun21/7517/2
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0 2 Describe what thin-client computing is and explain two reasons why a thin-client
system might be chosen in preference to a thick-client system.
[3 marks]
0 3 A data communications system can transmit four different signals. Each different
signal represents two bits of data.
0 3 . 1 Describe the exact relationship between the bit rate and the baud rate for this
system.
[1 mark]
0 3 . 2 Describe the relationship between the bit rate of the system and the bandwidth of the
transmission medium that the data is transmitted through.
[1 ma
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