Oxford Cambridge and RSA
Tuesday 20 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/02 Computational thinking, algorithms and programming
Time allowed: 1 hour 30 minutes
Do not use:
* 1 8 6 0 3 9 6 2 5 3 *
• a calculator
* J 2 7 7 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink.
• 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 [ ].
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
• We advise you to spend approximately 50 minutes on Section A and approximately
40 minutes on Section B.
© OCR 2025 [601/8355/X] OCR is an exempt Charity
DC (WW/JG) 355817/3 Turn over
, 2
Section A
We advise you to spend approximately 50 minutes on Section A.
1 A program asks a user to enter a number. Only integer values between 1 and 100 (inclusive) are
accepted. The program is tested.
(a) Tick (✓) one or more boxes in each row to identify the type or types of test for each example of
test data.
Invalid /
Example Normal Boundary
erroneous
test data test data test data
test data
27
"Hello"
105
100
[4]
(b) An algorithm is written for the program.
(i) Complete the algorithm for the program.
num = input("Enter a number between 1 and 100")
if num ........................................ AND ........................................ then
print("accepted")
........................................
print("not accepted")
endif
[3]
(ii) Give the identifier of one variable used in the algorithm in part (b)(i).
..................................................................................................................................................... [1]
(iii) Give one Boolean operator used in the algorithm in part (b)(i).
..................................................................................................................................................... [1]
© OCR 2025
, 3
2 This flowchart uses iteration.
Start
INPUT x
OUTPUT "OK"
x = x - 2
FALSE
IS x < 0?
TRUE
End
(a) Complete the table by identifying how many times "OK" will be output for when each value is input.
Input value Number of times "OK" is output
3
10
[2]
(b) Iteration is a programming construct.
(i) Identify and describe two different examples of iteration that can be used in a high-level
language.
1 .......................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[4]
© OCR 2025 Turn over
Tuesday 20 May 2025 – Afternoon
GCSE (9–1) Computer Science
J277/02 Computational thinking, algorithms and programming
Time allowed: 1 hour 30 minutes
Do not use:
* 1 8 6 0 3 9 6 2 5 3 *
• a calculator
* J 2 7 7 0 2 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink.
• 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 [ ].
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
• We advise you to spend approximately 50 minutes on Section A and approximately
40 minutes on Section B.
© OCR 2025 [601/8355/X] OCR is an exempt Charity
DC (WW/JG) 355817/3 Turn over
, 2
Section A
We advise you to spend approximately 50 minutes on Section A.
1 A program asks a user to enter a number. Only integer values between 1 and 100 (inclusive) are
accepted. The program is tested.
(a) Tick (✓) one or more boxes in each row to identify the type or types of test for each example of
test data.
Invalid /
Example Normal Boundary
erroneous
test data test data test data
test data
27
"Hello"
105
100
[4]
(b) An algorithm is written for the program.
(i) Complete the algorithm for the program.
num = input("Enter a number between 1 and 100")
if num ........................................ AND ........................................ then
print("accepted")
........................................
print("not accepted")
endif
[3]
(ii) Give the identifier of one variable used in the algorithm in part (b)(i).
..................................................................................................................................................... [1]
(iii) Give one Boolean operator used in the algorithm in part (b)(i).
..................................................................................................................................................... [1]
© OCR 2025
, 3
2 This flowchart uses iteration.
Start
INPUT x
OUTPUT "OK"
x = x - 2
FALSE
IS x < 0?
TRUE
End
(a) Complete the table by identifying how many times "OK" will be output for when each value is input.
Input value Number of times "OK" is output
3
10
[2]
(b) Iteration is a programming construct.
(i) Identify and describe two different examples of iteration that can be used in a high-level
language.
1 .......................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
[4]
© OCR 2025 Turn over
