Use pastpapers like this to help you revise
Understand exam format and structure
Past papers show the types of questions, mark allocations, and time limits,
helping students know what to expect in the real exam.
Identify frequently tested topics
By reviewing several past papers, students can spot patterns and common
themes that appear regularly.
Practice time management
Completing past papers under timed conditions helps students learn how
to pace themselves during the exam.
Improve exam technique
Students learn how to interpret command words (e.g. explain, compare,
evaluate) and structure answers effectively.
Assess strengths and weaknesses
Marking answers using mark schemes highlights areas that need more
revision.
Build confidence
Familiarity with exam-style questions reduces anxiety and increases
confidence going into the exam.
Improve accuracy and clarity
Repeated practice helps students write clearer, more precise answers and
avoid common mistakes.
Track progress over time
Comparing results from different past papers shows improvement and
helps students adjust revision strategies.
TYRIONPAPERS.COM
, Oxford Cambridge and RSA
Monday 12 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
Do not use:
* 1 3 7 9 9 9 3 0 5 8 *
• a calculator
* J 2 7 7 0 1 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
INFORMATION
• The total mark for this paper is 80.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in question marked with an asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8355/X] OCR is an exempt Charity
DC (ST) 336001/5 Turn over
for more: tyrionpapers.com
, 2
1 A student is creating a presentation containing images and sound.
(a) One of the files is an audio recording.
Complete the description of how a computer stores sound. Fill in the gaps using the given list of
terms. Not all terms will be used.
analogue colour depth higher repeated smaller
binary digital lower sample rate unique
bit depth height measuring sampling
byte hertz recording seconds
An ..................................................................... sound wave needs to be converted into a digital
sound wave.
Sound ..................................................................... is when the amplitude of the sound wave is
measured at set intervals.
The ..................................................................... is the number of times a second the sound wave
is measured. This is given in Hertz.
Each amplitude is given a ..................................................................... binary number. The
number of bits allocated to each sample is the ..................................................................... .
The ..................................................................... the number of bits, the wider the number of
amplitudes can be measured.
[6]
© OCR 2025
for more: tyrionpapers.com
Understand exam format and structure
Past papers show the types of questions, mark allocations, and time limits,
helping students know what to expect in the real exam.
Identify frequently tested topics
By reviewing several past papers, students can spot patterns and common
themes that appear regularly.
Practice time management
Completing past papers under timed conditions helps students learn how
to pace themselves during the exam.
Improve exam technique
Students learn how to interpret command words (e.g. explain, compare,
evaluate) and structure answers effectively.
Assess strengths and weaknesses
Marking answers using mark schemes highlights areas that need more
revision.
Build confidence
Familiarity with exam-style questions reduces anxiety and increases
confidence going into the exam.
Improve accuracy and clarity
Repeated practice helps students write clearer, more precise answers and
avoid common mistakes.
Track progress over time
Comparing results from different past papers shows improvement and
helps students adjust revision strategies.
TYRIONPAPERS.COM
, Oxford Cambridge and RSA
Monday 12 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
Do not use:
* 1 3 7 9 9 9 3 0 5 8 *
• a calculator
* J 2 7 7 0 1 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
INFORMATION
• The total mark for this paper is 80.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in question marked with an asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8355/X] OCR is an exempt Charity
DC (ST) 336001/5 Turn over
for more: tyrionpapers.com
, 2
1 A student is creating a presentation containing images and sound.
(a) One of the files is an audio recording.
Complete the description of how a computer stores sound. Fill in the gaps using the given list of
terms. Not all terms will be used.
analogue colour depth higher repeated smaller
binary digital lower sample rate unique
bit depth height measuring sampling
byte hertz recording seconds
An ..................................................................... sound wave needs to be converted into a digital
sound wave.
Sound ..................................................................... is when the amplitude of the sound wave is
measured at set intervals.
The ..................................................................... is the number of times a second the sound wave
is measured. This is given in Hertz.
Each amplitude is given a ..................................................................... binary number. The
number of bits allocated to each sample is the ..................................................................... .
The ..................................................................... the number of bits, the wider the number of
amplitudes can be measured.
[6]
© OCR 2025
for more: tyrionpapers.com
