A LEVEL COMPUTER SCIENCE
PAPER 2
7517/2
QUESTION PAPER
, 1
Do not write outside the
box
Questions 02.2, 02.3, 02.4 02.5 with a 7-bit
.
A-level
COMPUTER SCIENCE
Paper 2
Time allowed: 2 hours 30 minutes
Materials
For this paper you must have:
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IB/G/Jun20/7517/2
, 2
Do not write
outside the
box
• a calculator. For Examiner’s Use
Instructions
• Use black ink or black ball-point pen. Question Mark
• Fill in the boxes at the top of this page.
1
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the 2
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 3
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 4
marked.
5
Information 6
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 100. 7
8
Advice
• In some questions you are required to indicate your answer by completely
9
shading a lozenge alongside the appropriate answer as shown.
• If you want to change your answer you must cross out your original answer as 10
shown.
11
• If you wish to return to an answer previously crossed out, ring the answer
TOTAL
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
you now wish to select as shown.
*Jun207517201* IB/G/Jun20/E16 7517/2
IB/G/Jun20/7517/2
, 3
Do not write outside the
box
Questions 02.2, 02.3, 02.4 02.5 with a 7-bit
.
Answer all questions.
0 1 .1 A sound has been sampled and recorded. The sound was sampled for 1 minute and
40 seconds at a sample rate of 8000 Hz with a 16-bit sample resolution.
A sample rate of 1 Hz means that one sample has been taken every second.
Calculate the minimum amount of storage space, in bytes, needed to store the
sampled sound.
You should show your working.
[2 marks]
Answer
4
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IB/G/Jun20/7517/2
PAPER 2
7517/2
QUESTION PAPER
, 1
Do not write outside the
box
Questions 02.2, 02.3, 02.4 02.5 with a 7-bit
.
A-level
COMPUTER SCIENCE
Paper 2
Time allowed: 2 hours 30 minutes
Materials
For this paper you must have:
Turn over ►
IB/G/Jun20/7517/2
, 2
Do not write
outside the
box
• a calculator. For Examiner’s Use
Instructions
• Use black ink or black ball-point pen. Question Mark
• Fill in the boxes at the top of this page.
1
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside the 2
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 3
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 4
marked.
5
Information 6
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 100. 7
8
Advice
• In some questions you are required to indicate your answer by completely
9
shading a lozenge alongside the appropriate answer as shown.
• If you want to change your answer you must cross out your original answer as 10
shown.
11
• If you wish to return to an answer previously crossed out, ring the answer
TOTAL
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
you now wish to select as shown.
*Jun207517201* IB/G/Jun20/E16 7517/2
IB/G/Jun20/7517/2
, 3
Do not write outside the
box
Questions 02.2, 02.3, 02.4 02.5 with a 7-bit
.
Answer all questions.
0 1 .1 A sound has been sampled and recorded. The sound was sampled for 1 minute and
40 seconds at a sample rate of 8000 Hz with a 16-bit sample resolution.
A sample rate of 1 Hz means that one sample has been taken every second.
Calculate the minimum amount of storage space, in bytes, needed to store the
sampled sound.
You should show your working.
[2 marks]
Answer
4
Turn over ►
IB/G/Jun20/7517/2
