GCSE Computer Science OCR J277/02 Computational thinking algorithms programming GCSE computing revision pseudocode flowcharts programming concepts problem solving logic exam paper with mark scheme computing assessment

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2025 OCR GCSE Computer Science
J277/02 Computational thinking, algorithms and programming
Complete Question paper with Marking Scheme Combined


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:
• a calculator




Please write clearly in black ink. Do not write in the barcodes.

Centre number Candidate number
INSTRUCTIONS
• Use black ink.
• Write your answer to each question in the space provided. If you need extra space use
First name(s)
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
Last name
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.


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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]




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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]
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4
(ii) Give the names of two other programming constructs that are used in a high-level language.

1 .......................................................................................................................................................

2 .......................................................................................................................................................
[2]

(c) A programmer implements the flowchart as a program in a high-level language using an
Integrated Development Environment (IDE).

Identify and describe two tools that the programmer could use in the IDE to create a program
from the flowchart.

Tool 1 ................................................................................................................................................

Description .......................................................................................................................................

..........................................................................................................................................................

Tool 2 ................................................................................................................................................

Description .......................................................................................................................................

..........................................................................................................................................................
[4]




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