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OCR GCSE
COMPUTER
SCIENCE
2O25 OCR GCSE Computer Science J277/
Computer Systems
Question paper with Marking scheme
attached
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
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:
- a calculator Please write clearly in black ink. Do not write in the barcodes. Centre number First name(s) Last name Candidate number 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
(b) The student creates 10 bitmap images using a computer. Each image has a colour depth of 8-bits and a resolution of 800 × 500 pixels. (i) Define the term pixel. .......................................................................................................................................................... ..................................................................................................................................................... [1] (ii) Calculate the total file size of the 10 images in kilobytes. Show your working out. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... File size: ......................................... kilobytes [2] (iii) State the minimum number of bits that will be needed to represent 240 different colours. ..................................................................................................................................................... [1] (c) The student wants to use a secondary storage device to move their files to their home computer. Identify whether the student should use an optical or solid-state type of secondary storage device. Justify your choice. Optical or solid-state ........................................................... Justification ...................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [4] © OCR 2025 Turn over
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 Memory Peripheral User File function management management management 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
3* A company designs and builds tablet computers. The company wants to reduce the cost of manufacturing their tablet computers. The company also decides to stop releasing software updates for their older tablet computers. This means customers will need to change their devices more often. Discuss the impact of these decisions on the company and the customers. Include in your answer:
- ethical issues
- environmental issues
- benefits and drawbacks. [8] .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... © OCR 2025
© OCR 2025 Turn over
(c) The network design originally only had wired connections. The design is updated to include wireless connections via Wi-Fi. (i) Explain the benefits to the youth centre of also providing Wi-Fi connections. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [3] (ii) The decision to use wired and/or wireless connections can affect the performance of the network. Complete the table by explaining how each factor can affect the performance of a network. Factor How it affects performance ............................................................................................................ Bandwidth
Number of users
accessing the ............................................................................................................ network at the same time ............................................................................................................ ............................................................................................................ [4] © OCR 2025 Turn over
(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
(f) Identify one piece of legislation that the youth centre will need to follow when storing users’ data and describe the steps they need to take to meet the requirements of this legislation. Legislation ........................................................................................................................................ Steps the youth centre needs to follow ............................................................................................. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... [4] © OCR 2025
(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 38 26 01001110 4E 156 10011100 215 D [4] © OCR 2025 Turn over
6 A computer uses the ASCII character set. Part of the ASCII character set is shown here: Character Binary code K 01001011 L 01001100 M 01001101 N 01001110 (a) Write the binary code to represent the word POP using ASCII. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [2] (b) A new computer is being built. Identify one benefit and one drawback of the computer using Unicode instead of ASCII. Benefit .............................................................................................................................................. .......................................................................................................................................................... Drawback ......................................................................................................................................... .......................................................................................................................................................... [2] (c) The computer’s CPU contains registers. Complete the table by identifying two registers and state the purpose of each register. RegisterPurpose ..................................................................................................................... ................................ ..................................................................................................................... ..................................................................................................................... ................................ ..................................................................................................................... [2] END OF QUESTION PAPER © 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 OCR is committed to seeking permission to reproduce all third-party content that it uses in its assessment materials. OCR has attempted to identify and contact all copyright holders whose work is used in this paper. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced in the OCR Copyright 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. If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possible opportunity. For queries or further information please contact The OCR Copyright Team, The Triangle Building, Shaftesbury Road, Cambridge CB2 8EA. OCR is part of Cambridge University Press & Assessment, which is itself a department of the University of Cambridge. © OCR 2025
OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace with the changing needs of today’s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of the discussions which took place at an examiners’ meeting before marking commenced. All examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the report on the examination. © OCR 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.) 2
