Oxford Cambridge and RSA
A-Level OCR 2025 Computer Science Paper 2
Wednesday 18 June 2025 – Morning
A Level Computer Science
H446/02 Algorithms and programming
Time allowed: 2 hours 30 minutes
You can use:
• a ruler (cm/mm)
• an HB pencil
Do not use:
• a calculator
6 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre Candidate
number number
First name(s)
Last name
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 page 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 140.
• 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
,DO NOT WRITE ON THIS PAGE
,
, 2
Section A
1 Data in a computer program needs to be sorted.
(a)
(i) Describe the steps a bubble sort will take to sort items into ascending order.
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...................................................................................................................................................................... [5]
(ii) Darcie and Felix have both written a program that will perform a bubble sort to put these numbers
into ascending order.
2 1 3 4 5 6 7
Darcie’s version will complete six passes. However, Felix’s version will only need to complete
two passes.
Explain how Felix may have made his version more efficient than Darcie’s version.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [2]
© OCR 2025
A-Level OCR 2025 Computer Science Paper 2
Wednesday 18 June 2025 – Morning
A Level Computer Science
H446/02 Algorithms and programming
Time allowed: 2 hours 30 minutes
You can use:
• a ruler (cm/mm)
• an HB pencil
Do not use:
• a calculator
6 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre Candidate
number number
First name(s)
Last name
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 page 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 140.
• 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
,DO NOT WRITE ON THIS PAGE
,
, 2
Section A
1 Data in a computer program needs to be sorted.
(a)
(i) Describe the steps a bubble sort will take to sort items into ascending order.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [5]
(ii) Darcie and Felix have both written a program that will perform a bubble sort to put these numbers
into ascending order.
2 1 3 4 5 6 7
Darcie’s version will complete six passes. However, Felix’s version will only need to complete
two passes.
Explain how Felix may have made his version more efficient than Darcie’s version.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [2]
© OCR 2025
