A-Level Computer Science Paper 2 Algorithms Data Structures and
Problem Solving
A-level
COMPUTER SCIENCE
Paper 2
Monday 19 June 2023 Morning Time allowed: 2 hours 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• a calculator.
Question Mark
Instructions
1
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions. 2
3
4
5
6
7
8
9
10
11
12
TOTAL
, 2
Do not write
outside the
box
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
• 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 100.
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.
*JUN237517201* IB/G/Jun23/E7 7517/2
Answer all questions.
IB/G/Jun23/7517/2
, 3
Doutside the o not write
box
A sound is sampled and recorded digitally. The sound is sampled at a rate of 48 000
0 1 .1 samples per second (Hz) for 3 minutes using a 16-bit sample resolution.
Calculate the size of the digital recording, giving your answer in mebibytes.
Give your answer rounded to 2 decimal places.
You should show your working.
[2 marks]
Answer mebibytes
Turn over ►
IB/G/Jun23/7517/2
, 4
Do not write
outside the
box
The highest frequency component in a different sound is 15 000 Hz.
0 1 .2
What is the minimum sampling rate that should be used when recording this sound to
ensure that all the frequencies in the original waveform are preserved, so that when
the recording is played back the original sound is recreated accurately?
[1 mark]
Answer Hz
*02*
IB/G/Jun23/7517/2
Problem Solving
A-level
COMPUTER SCIENCE
Paper 2
Monday 19 June 2023 Morning Time allowed: 2 hours 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• a calculator.
Question Mark
Instructions
1
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions. 2
3
4
5
6
7
8
9
10
11
12
TOTAL
, 2
Do not write
outside the
box
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
• 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 100.
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.
*JUN237517201* IB/G/Jun23/E7 7517/2
Answer all questions.
IB/G/Jun23/7517/2
, 3
Doutside the o not write
box
A sound is sampled and recorded digitally. The sound is sampled at a rate of 48 000
0 1 .1 samples per second (Hz) for 3 minutes using a 16-bit sample resolution.
Calculate the size of the digital recording, giving your answer in mebibytes.
Give your answer rounded to 2 decimal places.
You should show your working.
[2 marks]
Answer mebibytes
Turn over ►
IB/G/Jun23/7517/2
, 4
Do not write
outside the
box
The highest frequency component in a different sound is 15 000 Hz.
0 1 .2
What is the minimum sampling rate that should be used when recording this sound to
ensure that all the frequencies in the original waveform are preserved, so that when
the recording is played back the original sound is recreated accurately?
[1 mark]
Answer Hz
*02*
IB/G/Jun23/7517/2
