AQA AS COMPUTER SCIENCE 7516/2 Paper 2 Version: 1.0 Final

AS COMPUTER SCIENCE 7516/2 Paper 2 Version: 1.0 Final *JUN* IB/G/Jun23/E13 7516/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TOTAL Monday 22 May 2023 Afternoon Time allowed: 1 hour 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 75. 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. AS COMPUTER SCIENCE Paper 2 2 *02* IB/G/Jun23/7516/2 Do not write outside the Answer all questions in the spaces provided. box 0 1 . 1 Shade in one lozenge to indicate which of the following values is an irrational number. [1 mark] A 3 4 B √2 C 73 D –19 0 1 . 2 Shade in one lozenge to indicate which of the following values is a natural number. [1 mark] A 3 4 B √2 C 73 D –19 0 1 . 3 Define the set of real numbers. [1 mark] 3 *03* Turn over ► IB/G/Jun23/7516/2 Do not write outside the 0 1 box . 4 Shade in one lozenge to indicate which of the following symbols represents the set of numbers most suitable for counting the number of people in a room. [1 mark] A ℕ B ℚ C ℝ D ℤ 0 1 . 5 What is meant by the term ordinal number? [1 mark] Turn over for the next question 5 4 *04* IB/G/Jun23/7516/2 Do not write outside the box 0 2 . 1 Assembly language programmers can use hexadecimal to represent bit patterns instead of binary. Explain why assembly language programmers will often choose to use hexadecimal in preference to binary. [1 mark] 0 2 . 2 How many different values can be represented using 10 bits? [1 mark] 2 5 *05* Turn over ► IB/G/Jun23/7516/2 Do not write outside the 0 3 box . 1 Shade in one lozenge to indicate which of the following prefixes represents 106 [1 mark] A kibi B mebi C gibi D kilo E meg