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Monday 12 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
Do not use:
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 GCSE Computer Science J277/01 Computer Systems Question paper &
Marking Scheme Summer 2025
© OCR 2025
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
2 A computer has an operating system.
(a) Tick (✓) one box on each row to identify the operating system function that will manage each
task.
Operating system
function
Memory
management
Peripheral
management
User
management
File
management
Multitasking
Renaming a folder
Creation of user accounts
Installation of a printer
driver
Transfer of data to and
from RAM
[5]
(b) A computer also has utility software.
(i) State the purpose of utility software in a computer.
. ................................................................................................................................................. [1]
(ii) Explain the purpose and function of encryption software.
. ................................................................................................................................................. [3]
© OCR 2025^ Turn^ over
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025^ Turn^ over
© OCR 2025
4 A youth centre is creating a network with 20 computers in a single building that will be connected
in a Local Area Network (LAN).
(a) Identify two reasons why this network will be a LAN and not a Wide Area Network (WAN).
[2]
(b) The network design connects the computers in a mesh topology.
(i) Describe what is meant by a mesh topology.
. ................................................................................................................................................. [2]
(ii) Describe one benefit and one drawback of the network using a mesh topology instead of a star
topology.
Benefit ..............................................................................................................................................
Drawback .........................................................................................................................................
[4]
© OCR 2025
(d) The youth centre is going to store data about users and events using cloud storage.
Describe the drawbacks to the youth centre of storing the data on the cloud.
. ................................................................................................................................................. [5]
(e) Users will have access to the internet.
(i) Identify one device that will be required to allow the LAN to connect to the internet.
. ................................................................................................................................................. [1]
© OCR 2025^ Turn^ over
(ii) The computers will be allocated an IPv4 address.
Tick (✓) one box on each row to identify if the IPv4 address is valid or invalid.
IPv
address
Valid
Invalid
[4]
(iii) When a user wants to access a website they enter the URL into the address bar of a web
browser.
Describe the steps that take place to convert the URL into the website’s IP address.
. ................................................................................................................................................. [4]
© OCR 2025^ Turn^ over
(a) Tick (✓) one box to identify the quantity of megabytes that is the same as 2 terabytes.
2000 MB
20 000 MB
200 000 MB
2 000 000 MB
[1]
(b) Each row in the table contains a number that is written as a denary value, 8 - bit binary value and
a 2-digit hexadecimal value. Some values are missing.
Complete the table by writing in the missing value for each number.
Denary 8 - bit binary 2 - digit hexadecimal
01001110 4E
215 D
[4]
© OCR 2025
(c) Complete the binary addition of these two 8 - bit binary numbers.
Show your working out.
(d) Tick (✓) one box to identify the result of a 2 - place right binary shift on the binary number
[2]
[1]
(e) Describe the binary shift that can be used to multiply any number by 8.
. ................................................................................................................................................. [2]
© OCR 2025
EXTRA ANSWER SPACE
If you need extra space use this lined page. You must write the question numbers clearly in the
margin.
Oxford Cambridge and RSA
Copyright Information
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Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download from our public website (www.ocr.org.uk) after the live examination series.
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OCR is part of Cambridge University Press & Assessment, which is itself a department of the University of Cambridge.
GCSE
Computer Science
J277/01: Computer systems
General Certificate of Secondary Education
Mark Scheme for June 2025
Oxford Cambridge and RSA Examinations
J277/01 Mark Scheme June 2025
MARKING INSTRUCTIONS
PREPARATION FOR MARKING
RM ASSESSOR
- Make sure that you have accessed and completed the relevant training packages for on-screen marking: RM Assessor Online Training: OCR
Essential Guide to Marking.
- Make sure that you have read and understood the mark scheme and the question paper for this unit. These are available in RM Assessor
- Log-in to RM Assessor and mark the required number of practice responses (“scripts”) and the required number of standardisation responses.
MARKING
- Mark strictly to the mark scheme.
- Marks awarded must relate directly to the marking criteria.
- The schedule of dates is very important. It is essential that you meet the RM Assessor 50% and 100% (traditional 40% Batch 1 and 100% Batch 2)
deadlines. If you experience problems, you must contact your Team Leader (Supervisor) without delay.
- If you are in any doubt about applying the mark scheme, consult your Team Leader by telephone or the RM Assessor messaging system, or by email.
- Crossed Out Responses
Where a candidate has crossed out a response and provided a clear alternative then the crossed out response is not marked. Where no alternative
response has been provided, examiners may give candidates the benefit of the doubt and mark the crossed out response where legible.
Rubric Error Responses – Optional Questions
Where candidates have a choice of question across a whole paper or a whole section and have provided more answers than required, then all responses
are marked and the highest mark allowable within the rubric is given. Enter a mark for each question answered into RM assessor, which will select the
highest mark from those awarded. (The underlying assumption is that the candidate has penalised themselves by attempting more questions than
necessary in the time allowed.)
