2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
2O25 OCR A Level Computer Science
H446/01 Computer systems
Verified Question paper with Marking
Scheme combined
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 140.
• The marks for each question are shown
OCR A LEVEL in brackets [ ].
• Quality of extended response will be
COMPUTER assessed in questions marked with an asterisk
(*).
• This document has 32 pages.
SCIENCE ADVICE
• Read each question carefully before you
start your answer.
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
,2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
Oxford Cambridge and RSA
Wednesday 11 June 2025 – Morning
A Level Computer Science
H446/01 Computer systems
Time allowed: 2 hours 30 minutes
You can use:
• a ruler (cm/mm)
• an HB pencil
Do not use:
• a calculator*
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 140.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/4911/5] OCR is an exempt Charity
DC (PQ/CB) 340531/5 Turn over
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
,2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
, 2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
3
1 Charlie is about to study a computer games design course at university. He needs to purchase a
computer to allow him to design and edit the graphics in his games, including video files.
(a) Charlie’s computer contains a data bus, an address bus and a control bus. State
the purpose of each of these three buses.
Data bus ...........................................................................................................................................
..........................................................................................................................................................
Address bus .....................................................................................................................................
..........................................................................................................................................................
Control bus .......................................................................................................................................
..........................................................................................................................................................
[3]
(b) Charlie will need to use input and output devices when designing and editing his computer games.
(i) State one input device and one output device that Charlie could use and give an example use of each.
Input device
Device name ....................................................................................................................................
..........................................................................................................................................................
Example use ....................................................................................................................................
..........................................................................................................................................................
Output device
Device name .....................................................................................................................................
..........................................................................................................................................................
Example use .....................................................................................................................................
..........................................................................................................................................................
[4]
© OCR 2025 Turn over
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
2O25 OCR A Level Computer Science
H446/01 Computer systems
Verified Question paper with Marking
Scheme combined
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 140.
• The marks for each question are shown
OCR A LEVEL in brackets [ ].
• Quality of extended response will be
COMPUTER assessed in questions marked with an asterisk
(*).
• This document has 32 pages.
SCIENCE ADVICE
• Read each question carefully before you
start your answer.
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
,2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
Oxford Cambridge and RSA
Wednesday 11 June 2025 – Morning
A Level Computer Science
H446/01 Computer systems
Time allowed: 2 hours 30 minutes
You can use:
• a ruler (cm/mm)
• an HB pencil
Do not use:
• a calculator*
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 140.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/4911/5] OCR is an exempt Charity
DC (PQ/CB) 340531/5 Turn over
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
,2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
, 2O25 OCR 2O25
A Level
OCRComputer
2O25
A Level
OCR
Science
Computer
A Level
H44601
Science
Computer
Computer
H44601
Science
systems
Computer
H44601
Verified
systems
Computer
Question
Verified
systems
paper
Question
Verified
with Marking
paper
Question
with
Scheme
Marking
papercombined.pdf
with
Scheme
Marking
combined.pdf
Scheme combined.pdf
3
1 Charlie is about to study a computer games design course at university. He needs to purchase a
computer to allow him to design and edit the graphics in his games, including video files.
(a) Charlie’s computer contains a data bus, an address bus and a control bus. State
the purpose of each of these three buses.
Data bus ...........................................................................................................................................
..........................................................................................................................................................
Address bus .....................................................................................................................................
..........................................................................................................................................................
Control bus .......................................................................................................................................
..........................................................................................................................................................
[3]
(b) Charlie will need to use input and output devices when designing and editing his computer games.
(i) State one input device and one output device that Charlie could use and give an example use of each.
Input device
Device name ....................................................................................................................................
..........................................................................................................................................................
Example use ....................................................................................................................................
..........................................................................................................................................................
Output device
Device name .....................................................................................................................................
..........................................................................................................................................................
Example use .....................................................................................................................................
..........................................................................................................................................................
[4]
© OCR 2025 Turn over
2O25 OCR 2O25
A Level
OCRComputer
A LevelScience
Computer
H44601
Science
Computer
H44601systems
Computer
Verified
systemsQuestion
Verified
paper
Question
with Marking
paper with
Scheme
Marking
combined.pdf
Scheme combined.pdf
4/13/2026, 4:25:28 PM
