Oxford Cambridge and RSA - 2025
Monday 12 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
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2025 OCR GCSE (9–1) Computer Science J277/01 Computer Systems, Exams of Computer Science
2025 OCR GCSE (9–1) Computer Science J277/01 Computer Systems Time allowed: 1 hour 30 minutes (Verified Question Paper With Mark Scheme Combined June 2025) 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) 336001/5 OCR is an exempt Charity Turn over 1 A student is creating a presentation containing images and sound.
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Oxford Cambridge and RSA - 2025
Monday 12 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
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
© OCR (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 ........................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ .............. ............................................................................................................................................ ..............
© OCR^ Turn^ over
.................................................................................................................................. [4]
© OCR Turn over
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 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
© OCR^ Turn^ over 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 .......................................................................................................................... ............... ............................................................................................................................................ ..............
© OCR^ 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 (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
.................................................................................................................................. [4]
© OCR^ Turn^ over (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^ Turn^ over (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 01110111.
[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 ................................