AQA GCSE COMPUTER SCIENCE WRITTEN ASSESSEMENT QUESTION PAPER 2 2020

AQA GCSE COMPUTER SCIENCE WRITTEN

ASSESSEMENT QUESTION PAPER 2 2020

Please write clearly in block capitals.Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work.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.

GCSE

COMPUTER SCIENCE

Paper 2 Written Assessment

Thursday 14 May 2020 Afternoon Time allowed: 1 hour 30 minutes

Materials • There are no additional materials required for this paper.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.• You must not use a calculator.Information • The total number of marks available for this paper is 80.Advice

*Jun20520201* IB/G/Jun20/E13 8520/2 For Examiner’s Use Question Mark 1–2 3–5 6–8 9 10 11 12 TOTAL

2 Do not write outside the *02* IB/G/Jun20/8520/2

1 2 3 4

Answer all questions.

box

. State the decimal representation of the binary number 10010100 [1 mark]

. State the hexadecimal representation of the binary number 10010100 [1 mark]

. State the hexadecimal representation of the decimal number 143 You should show your working.

[2 marks]

Answer

. State the binary representation of the hexadecimal number BE

You should show your working.[2 marks]

Answer

• 0
• 0
• 0
• 0

3 Do not write outside the *03* IB/G/Jun20/8520/2

1 2

11

box

. Add together the following three binary numbers and give your answer in binary.

0 1 0 1 0 1 0 1

0 1 1 0 1 1 0 0

+ 0 0 0 1 1 0 0 1

[2 marks]

. State the result, in binary, of performing a binary shift two places to the left on the binary value 00111001 [1 mark]

Turn over for the next question

Turn over ►

• 0
• 0

• 1 . 5 Give two reasons why hexadecimal is often used instead of binary in computer

science.[2 marks]

1

2