Describe the purpose of the MAR, MDR, program counter and accumulator.
1(c)4 marks
Describe what happens during the fetch stage of the fetch–execute cycle.
1(d)6 marks
A gamer is choosing between two CPUs: CPU A has 4 cores, 4.2 GHz, 8 MB cache; CPU B has 8 cores, 3.4 GHz, 16 MB cache. Discuss which would give better performance.
1(e)2 marks
Give two examples of embedded systems.
2(a)2 marks
Give two differences between RAM and ROM.
2(b)3 marks
Explain why a computer may need virtual memory and one drawback.
2(c)3 marks
Recommend a type of secondary storage for a school's daily backup of 6 TB of data. Justify your answer.
2(d)2 marks
How many 600 MB videos can be stored on a 2 TB drive? Show your working (use 1 TB = 1,000 GB = 1,000,000 MB).
2(e)1 mark
Convert denary 200 to 8-bit binary.
2(f)1 mark
Convert hexadecimal A7 to denary.
2(g)2 marks
Add 11010110 and 01100101 in 8-bit binary and explain the result.
2(h)2 marks
State the result of a right shift of 3 places on 01101000 and its effect.
2(i)2 marks
Explain how characters are represented using a character set.
2(j)3 marks
Explain what metadata is stored with an image and why it is needed.
2(k)3 marks
Explain how increasing the sample rate affects a sound file.
2(l)2 marks
Explain one reason for compressing a file before emailing it.
3(a)2 marks
State two differences between a LAN and a WAN.
3(b)3 marks
Describe three factors that affect the performance of a network.
3(c)4 marks
Compare client–server and peer-to-peer networks.
3(d)2 marks
Give one advantage of a star topology and one of a mesh topology.
3(e)3 marks
State the purpose of HTTPS, SMTP and IMAP.
3(f)2 marks
Explain why protocols are organised in layers.
4(a)4 marks
Describe two forms of attack on a network.
4(b)3 marks
Describe three methods of preventing network attacks.
5(a)3 marks
Describe three functions of an operating system.
5(b)3 marks
Describe the purpose of encryption, defragmentation and data compression utility software.
68 marks
A supermarket plans to replace all checkouts with self-service machines and track customers' purchases through a loyalty app. Discuss the ethical, legal, cultural and environmental issues of this plan.
Finished?
Answer every question to finish (28 left), or finish when the time’s up.
Score 0 / 80 · 0 of 28 marked
This paper is written by Plasmo in the style of the OCR GCSE Computer Science exam. It is not a past paper and is not produced or endorsed by the exam board.
OCR GCSE Computer Science Mock Exam: Paper 1: Computer systems | Plasmo