Download 2024 AQA GCSE COMPUTER SCIENCE 8525/2 Paper 2 Computing concepts Verified Question Paper and more Exams Computer Science in PDF only on Docsity!
For the multiple-choice questions, completely fill in the lozenge alongside the appropriate answer. CORRECT METHOD WRONG METHODS 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.
2024 AQA GCSE COMPUTER SCIENCE 8525/2 Paper 2
Computing concepts
Verified Question Paper with Marking Scheme Combined.
June 2024
Materials
- There are no additional materials required for this paper.
- You must not use a calculator.
Instructions
- Use black ink or black ball-point pen. Use pencil only for drawing.
- Answer all questions.
- You must answer the questions in the spaces provided.
- 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 total number of marks available for this paper is 90.
Advice
For Examiner’s Use Question Mark 1 – 4 5 – 6 7 – 8 9 10 – 12 13 14 – 17 18 19 TOTAL
Do not write outside the Answer all questions. box (^0 1) Which statement best describes what computers represent using binary? Shade one lozenge. [1 mark] A All data are represented using binary. B All data and instructions are represented using binary. C Some data and instructions are represented using binary. D Some instructions are represented using binary.
0 2. 1 Convert the binary number 10110111 into decimal.
[1 mark] (^0 2). (^2) Convert the decimal number 112 into hexadecimal. You should show your working. [2 marks] Answer
Do not write outside the box Turn over ►
Do not write outside the box (^0 4). 3 Which statement best describes where a single binary shift can be used? Shade one lozenge. [1 mark] A Multiply or divide numbers by any even number. B Multiply or divide numbers by any number. C Multiply or divide numbers by any odd number. D Multiply or divide numbers by powers of two.^9
Do not write outside the Turn over for the next question box Turn over ►
Do not write outside the box (^0 5) Figure 2 shows four bitmap images. Figure 2 (^0 5). 1 State the number of pixels in Image A in Figure 2. [1 mark] (^0 5). (^2) State the minimum colour depth required to represent Image B in Figure 2. [1 mark]
Do not write outside the box Turn over ►
Do not write outside the Figure 2 has been included again below. Figure 2 box
Do not write outside the box 0 6 Calculate the number of bits in 7 MB. Show your working. [2 marks] Answer bits^9
Do not write outside the box 1 0 7 Figure 4 shows a logic gate. Figure 4
. Which truth table matches the logic gate in Figure 4? Shade one lozenge. [1 mark] A B C D Question 7 continues on the next page Turn over ►
A B
A B Q
A B Q
A B Q
Do not write outside the box (^0 7). 3 Figure 6 shows a different logic circuit. Figure 6 Write a Boolean expression that represents the logic circuit shown in Figure 6. You must use the correct symbols for the Boolean operators in your expression. [3 marks] Q = Turn over for the next question Turn over ►
Do not write outside the box (^0 8). 1 Three major components of a Central Processing Unit (CPU) are:
- control unit
- clock
- cache. Describe the function of each of the three components. [6 marks] Control unit Clock Cache
Do not write outside the box (^0 9). 1 Figure 7 contains a Huffman tree. Figure 7 The Huffman tree in Figure 7 was used to encode a string, which resulted in the following bit pattern:
State the string that this bit pattern represents. [2 marks]
Do not write outside the
. 2 Table 1 shows the Huffman codes for the characters used in the string
HESELLSSEASHELLASHES
Table 1 Character Character frequency Huffman code
S 6 11
E 5 10
L 4 00
H 3 011
A 2 010
Calculate how many bits would be saved if the string HESELLSSEASHELLASHES
was encoded using the Huffman codes shown in Table 1 , rather than using ASCII. box You should show your working. [3 marks] Number of bits saved Turn over ►
