OCR GCSE Computer Science Computer systems (01), June 2025
Every question from OCR GCSE Computer Science Computer systems (01), June 2025 (J277): 6 questions, 76 marks, each with its mark scheme and topic.
- Question 1 14 marks
Complete sentences on sound sampling, define a pixel, calculate the file size of 10 bitmap images in kilobytes, determine the minimum bits for 240 colours, and justify selecting optical or solid-state storage to transfer files.
1.2 Memory and storage · 1.2.2 Secondary storage · 1.2.3 Units · 1.2.4 Data storage
- Question 2 9 marks
Identify operating system functions for various computer tasks, state the purpose of utility software, and explain the purpose and function of encryption software.
1.5 Systems software · 1.5.1 Operating systems · 1.5.2 Utility software
- Question 3 8 marks
Discuss the ethical, environmental, and practical impacts on both the company and customers when a tablet manufacturer cuts manufacturing costs and stops software updates for older devices.
1.6 Ethical, legal, cultural and environmental impacts of digital technology · 1.6.1 Ethical, legal, cultural and environmental impact
- Question 4 29 marks
Explain network types, topologies, performance factors, cloud storage drawbacks, DNS URL resolution, IPv4 address validity, and Data Protection Act requirements for a youth centre network.
1.3 Computer networks, connections and protocols · 1.6 Ethical, legal, cultural and environmental impacts of digital technology · 1.3.1 Networks and topologies · 1.3.2 Wired and wireless networks, protocols and layers · 1.6.1 Ethical, legal, cultural and environmental impact
- Question 5 10 marks
Perform unit conversions, number base conversions between denary, 8-bit binary, and hexadecimal, 8-bit binary addition, and binary shifts.
1.2 Memory and storage · 1.2.3 Units · 1.2.4 Data storage
- Question 6 6 marks
Encode a word in ASCII using a given sequence, evaluate Unicode versus ASCII, and identify two CPU registers and their purposes.
1.1 Systems architecture · 1.2 Memory and storage · 1.1.1 Architecture of the CPU · 1.2.4 Data storage