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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:
- a calculator Please write clearly in black ink. Do not write in the barcodes. Centre number Candidate number First name(s) Last name
OCR GCSE (9–1) Computer Science
J277/01 Computer Systems Question
Paper with FINAL MARKING SCHEME
Oxford Cambridge and RSA 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] DC (ST) 336001/ OCR is an exempt Charity Turn over
(^1) (^3) (^7) (^9) (^9) (^9) (^3) (^0) (^5) (^8) (^) *
© OCR 2025 (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
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DO NOT WRITE ON THIS PAGE
© 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 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). 1 ....................................................................................................................................................... .......................................................................................................................................................... 2 ....................................................................................................................................................... .......................................................................................................................................................... [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^ 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 (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 ( ✓ ) 192.154.21. 258.0.0. 56.1.2.66. 251.58.3. [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 (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 (c) Complete the binary addition of these two 8 - bit binary numbers. Show your working out. 0 1 1 1 0 0 1 1
- 0 0 1 1 0 1 0 0 (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]
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. Register Purpose ................................
[2]
END OF QUESTION PAPER
© OCR 2025
GCSE Computer Science J277/01: Computer systems
General Certificate of Secondary Education
Mark Scheme for June 2025 Oxford Cambridge and RSA Examinations
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
