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Download Actual 2024 AQA GCSE COMPUTER SCIENCE 8525/2 Paper 2 Merged Question Paper + Mark Scheme A and more Exams Computer Science in PDF only on Docsity!
Actual 2024 AQA GCSE COMPUTER SCIENCE 8525/2 Paper 2 Merged Question Paper + Mark Scheme AQA Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature | declare this is my own work. GCSE COMPUTER SCIENCE Paper 2 Computing concepts Tuesday 21 May 2024 Afternoon Time allowed: 1 hour 45 minutes Materials a . . . For Examiner's Use e There are no additional materials required for this paper. ahfs « You must not use a calculator. ae Question Mark Instructions . im e Use black ink or black ball-point pen. Use pencil only for drawing. 5-6 e Answer all questions. 7-8 e You must answer the questions in the spaces provided. 9 ¢ 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). 10-12 ¢ Do all rough work in this book. Cross through any work you do not want 13 to be marked. 14-17 Information Ag The total number of marks available for this paper is 90. 19 Advice uouE For the multiple-choice questions, completely fill in the lozenge alongside the appropriate answer. CORRECT METHOD [e| WRONG METHODS If you want to change your answer you must cross out your original answer as shown. De If you wish to return to an answer previously crossed out, ring the answer you now wish to select as shown. IMI UN 2 4 8 0000 IB/G/Jun24/G4004/E8 8525/2 [oj2][4] [o[2][2] 02 Do not write outside the Answer all questions. box 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. [o} [2] {2} [o) D Some instructions are represented using binary. Convert the binary number 10110111 into decimal. [1 mark] Convert the decimal number 112 into hexadecimal. You should show your working. [2 marks] Answer IB/G/Jun24/8525/2 2 [0[4].[3] Which statement best describes where a single binary shift can be used? INI Shade one lozenge. 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. [o] Lo} [a] [o] [1 mark] IB/G/Jun24/8525/2 Do not write outside the box Do not write outside the Turn over for the next question ‘box DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED Turn over > INN IB/G/Jun24/8525/2 5 Do not write outside the [o|5].[3| Calculate the minimum amount of storage required to store Image D from Figure 2. box Give your answer in bytes. Show your working. [2 marks] Answer bytes Question 5 continues on the next page Turn over > INI IB/G/Jun24/8525/2 7 Do not write outside the box Figure 2 has been included again below. Figure 2 Image A Image B Image C Image D 08 1B/G/Jun24/8525/2 8 INIA 10 Do not write outside the Calculate the number of bits in 7 MB. box Show your working. [2 marks] Answer bits 9 IB/GiJun24/8525/2 10 11 Do not write outside the Figure 4 shows a logic gate. box. Figure 4 [0|7].[1] Which truth table matches the logic gate in Figure 4? Shade one lozenge. [1 mark] A B A oy i [e] 1 0 A B Q 0 0 0 B 0 1 0 [e] 1 0 0 1 1 1 A B Q 0 0 0 c 0 1 1 [e] 1 0 1 1 1 1 A B Q 0 0 0 D 0 1 1 [e] 1 0 1 1 1 0 Question 7 continues on the next page Turn over > INIA IB/GiJun24/8525/2 11 13 Do not write outside the [0[7].[3] Figure 6 shows a different logic circuit. box 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 > INIA IB/GiJun24/8525/2 13 14 Do not write 7 . . outside the [o[8].[4] Three major components of a Central Processing Unit (CPU) are: box © control unit ¢ clock ° cache. Describe the function of each of the three components. [6 marks] Control unit Clock Cache IB/GiJun24/8525/2 14 16 Do not write . . outside the [o[9|.[4] Figure 7 contains a Huffman tree. box. Figure 7 The Huffman tree in Figure 7 was used to encode a string, which resulted in the following bit pattern: 0001011001 State the string that this bit pattern represents. [2 marks] INIA IB/GiJun24/8525/2 16 17 Do not write outside the [o|9].[2| Table 1 shows the Huffman codes for the characters used in the string box HESELLSSEASHELLASHES Table 1 Character ¢ eaueney Huffman code iS} 6 11 E 5 10 L 4 00 H 3 oll A 2 010 20 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. You should show your working. [3 marks] Number of bits saved Turn over > 17 IB/G/Jun24/8525/2 17 19 [1[2| Describe how compilers and interpreters operate. [6 marks] Do not write outside the box Turn over > IB/G/Jun24/8525/2 19 20 [1] 3] [1] Define the term computer network. [2 marks] [1] 3] [2] A school has purchased new computers for students and staff to use. 20 The school is considering installing the computers in a network. Discuss the advantages and disadvantages to the school, staff and students of having the computers installed in a network. [6 marks] IB/G/Jun24/8525/2 Do not write outside the box 20 
