Oxford Cambridge and RSA - 2025
Tuesday 13 May 2025 – Afternoon
AS Level Computer Science
H046/01 Computing principles
Time allowed: 1 hour 15 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
, INSTRUCTIONS
• Use black ink.
• Write your answer to each question in the space provided. You can use
extra paper if you need to, but you must clearly show your candidate
number, the centre number and the question numbers.
• Answer all the questions.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an
asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025
OCR is an exempt
[601/5030/0] DC
Charity Turn over
(PQ/CGW) 324947/5
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR
2025
, 3
1 The table shows the steps of the Fetch stage only of the Fetch-Decode-Execute
cycle. The names of the registers are referred to as A, B, C and D.
1 The contents of the Register A are copied into the Register B.
2a RAM is read at the location specified by the Register B and its contents are
copied into the Register C.
2b Register A is incremented by 1.
3 The contents of the Register C are copied into the Register D.
(a) State the name of each register in the table.
Register A
Register B
Register C
Register D
[4]
(b) Describe how the performance of the Fetch-Decode-Execute cycle changes when
increasing:
(i) The number of cores
............................................................................................................................................
..............
.................................................................................................................................. [1]
(ii) The clock speed
............................................................................................................................................
..............
.................................................................................................................................. [1]
© OCR Turn over
2025
Tuesday 13 May 2025 – Afternoon
AS Level Computer Science
H046/01 Computing principles
Time allowed: 1 hour 15 minutes
(Verified Question Paper With Mark
Scheme Combined June 2025)
, INSTRUCTIONS
• Use black ink.
• Write your answer to each question in the space provided. You can use
extra paper if you need to, but you must clearly show your candidate
number, the centre number and the question numbers.
• Answer all the questions.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an
asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025
OCR is an exempt
[601/5030/0] DC
Charity Turn over
(PQ/CGW) 324947/5
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR
2025
, 3
1 The table shows the steps of the Fetch stage only of the Fetch-Decode-Execute
cycle. The names of the registers are referred to as A, B, C and D.
1 The contents of the Register A are copied into the Register B.
2a RAM is read at the location specified by the Register B and its contents are
copied into the Register C.
2b Register A is incremented by 1.
3 The contents of the Register C are copied into the Register D.
(a) State the name of each register in the table.
Register A
Register B
Register C
Register D
[4]
(b) Describe how the performance of the Fetch-Decode-Execute cycle changes when
increasing:
(i) The number of cores
............................................................................................................................................
..............
.................................................................................................................................. [1]
(ii) The clock speed
............................................................................................................................................
..............
.................................................................................................................................. [1]
© OCR Turn over
2025
