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AQA A-level COMPUTER SCIENCE Paper 2 QP 2021

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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* Turn over ► IB/G/Jun21/7517/2 Do not write outside the box 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 Do not write outside the box 3 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 [Show More]

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