Computer Science > QUESTION PAPER & MARK SCHEME > AQA A-level COMPUTER SCIENCE 7517/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+ (All)

AQA A-level COMPUTER SCIENCE 7517/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+

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AQA A-level COMPUTER SCIENCE 7517/2 Paper 2 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217517201* IB/G/Jun21/E17 7517/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TOTAL Time allowed: 2 hours 30 minutes Materials For this paper you must have: • a calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 100. Advice • In some questions you are required to indicate your answer by completely shading a lozenge alongside the appropriate answer as shown. • If you want to change your answer you must cross out your original answer as shown. • If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level COMPUTER SCIENCE Paper 2 2 *02* IB/G/Jun21/7517/2 Do not write outside the box Answer all questions. 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] Answer 3 *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 question 4 *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]

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