ACADEMICMASTER
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
GCSE
COMPUTER SCIENCE
Paper 2 Written Assessment
Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
There are no additional materials required for this paper. Questio Mark
n
Instructions 1–3
Use black ink or black ball-point pen. Use pencil only for drawing.
4–5
Answer all questions.
You must answer the questions in the spaces provided. 6–9
If you need extra space for your answer(s), use the lined pages at 10
the end of this book. Write the question number against your 11
answer(s).
12–13
Do all rough work in this book. Cross through any work you do
not want to be marked. 14–15
You must not use a calculator. 16–17
18–19
Information
20
The total number of marks available for this paper is 80.
TOTAL
Advice
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 a
*Jun21 520201*
IB/G/Jun21/E12 8520/2
, 2
Do not write
outside the
Answer all questions in the spaces box
provided.
0 1 .1 Convert the decimal number 220 into binary.
[1 mark]
0 1 .2 Convert the hexadecimal number AD into binary.
You should show your working.
[2 marks]
Answer
0 1 .3 Convert the hexadecimal number 1A into decimal.
[1 mark]
*02
IB/G/
* Jun21/8520/2
, 3
Do not write
outside the
0 1 .4 What is the largest hexadecimal number that can be represented in box
binary using 8 bits?
[1 mark]
0 2 Which of the following is a reason why hexadecimal is used instead of
binary?
Shade one lozenge.
[1 mark]
A Computers work in hexadecimal, not binary.
B Hexadecimal can be used to represent a wider range of numbers.
C Hexadecimal is a standard language and binary is not.
D Hexadecimal is more compact when displayed on screen.
0 3 Figure 1 shows a value represented as a bit pattern.
Figure 1
1 0 1 1 0 0 0 0
A binary shift can be used to divide the value in Figure
1 by 4. What is the result of this shift?
Your answer must be in binary.
[1 mark]
7
Turn over ►
*03
IB/G/
* Jun21/8520/2
, 4
Do not write
outside the
Add0the
4 following binary numbers and give your answer in binary. box
[2
marks]
1 0 1 1 0 1 0 0
0 0 1 0 0 0 1 0
+ 0 0 0 1 0 1 0 1
0 minutes
Eight 5 of sound has been digitally recorded. The sampling rate used was 25
000 Hertz and the sample resolution used was 4 bits.
0 5 .1 Calculate the minimum file size for the recording. Give your answer in megabytes.
You should show your working.
[4 marks]
Answer
*04
IB/G/
* Jun21/8520/2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
GCSE
COMPUTER SCIENCE
Paper 2 Written Assessment
Time allowed: 1 hour 30 minutes
Materials For Examiner’s Use
There are no additional materials required for this paper. Questio Mark
n
Instructions 1–3
Use black ink or black ball-point pen. Use pencil only for drawing.
4–5
Answer all questions.
You must answer the questions in the spaces provided. 6–9
If you need extra space for your answer(s), use the lined pages at 10
the end of this book. Write the question number against your 11
answer(s).
12–13
Do all rough work in this book. Cross through any work you do
not want to be marked. 14–15
You must not use a calculator. 16–17
18–19
Information
20
The total number of marks available for this paper is 80.
TOTAL
Advice
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 a
*Jun21 520201*
IB/G/Jun21/E12 8520/2
, 2
Do not write
outside the
Answer all questions in the spaces box
provided.
0 1 .1 Convert the decimal number 220 into binary.
[1 mark]
0 1 .2 Convert the hexadecimal number AD into binary.
You should show your working.
[2 marks]
Answer
0 1 .3 Convert the hexadecimal number 1A into decimal.
[1 mark]
*02
IB/G/
* Jun21/8520/2
, 3
Do not write
outside the
0 1 .4 What is the largest hexadecimal number that can be represented in box
binary using 8 bits?
[1 mark]
0 2 Which of the following is a reason why hexadecimal is used instead of
binary?
Shade one lozenge.
[1 mark]
A Computers work in hexadecimal, not binary.
B Hexadecimal can be used to represent a wider range of numbers.
C Hexadecimal is a standard language and binary is not.
D Hexadecimal is more compact when displayed on screen.
0 3 Figure 1 shows a value represented as a bit pattern.
Figure 1
1 0 1 1 0 0 0 0
A binary shift can be used to divide the value in Figure
1 by 4. What is the result of this shift?
Your answer must be in binary.
[1 mark]
7
Turn over ►
*03
IB/G/
* Jun21/8520/2
, 4
Do not write
outside the
Add0the
4 following binary numbers and give your answer in binary. box
[2
marks]
1 0 1 1 0 1 0 0
0 0 1 0 0 0 1 0
+ 0 0 0 1 0 1 0 1
0 minutes
Eight 5 of sound has been digitally recorded. The sampling rate used was 25
000 Hertz and the sample resolution used was 4 bits.
0 5 .1 Calculate the minimum file size for the recording. Give your answer in megabytes.
You should show your working.
[4 marks]
Answer
*04
IB/G/
* Jun21/8520/2
