GCSE (9–1) Computer Science - J277/02 Computational thinking, algorithms and programming - Question Paper

Sep 5, 2026

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GCSE (9–1) Computer Science paper J277/02 assesses computational thinking through algorithm design, problem solving and programming concepts. Section A includes selecting programming constructs, completing an incomplete flowchart for odd/even determination, identifying syntax and logic errors, and demonstrating binary search usage with prerequisites. It also covers defensive design for a video-rating program, and completes a Boolean truth table. Questions require clear coding, correct control flow, and understanding of search, sorting, inputs/outputs and logic gates.

LanguageEnglish

CategoryExam

FormatPDF

Pages20

Reading Time50 min

AccessFree to download

Section A

Programming constructs and control flow

Algorithms: flowcharts, syntax and logic errors

Binary search and sorting

Inputs, outputs and defensive design

Boolean logic: truth tables

Logic circuits

Oxford Cambridge and RSA Tuesday 21 May 2024 – 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 | | | 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 2024 [601/8355/X] DC (ST) 342920/6 OCR is an exempt Charity Turn over 2 SECTION A We advise you to spend approximately 50 minutes on Section A. 1 Tick (✓) one box in each row to identify the programming construct where each keyword is used. | Keyword | Programming construct | | | --- | --- | --- | | | Selection | Iteration | | if | | | | for | | | | while | | | [3] 2 An algorithm decides if a number is odd or even. An odd number divided by 2 will give the remainder 1. The flowchart statements have been written for the algorithm, but the flowchart is incomplete. Complete the flowchart. Start INPUT num if num MOD 2 == 0 OUTPUT "Odd" OUTPUT "Even" End [4] © OCR 2024 3 3 (a) State what is meant by the term syntax error. Give one example of a syntax error in a program. Definition .......................................................................................................................................... .......................................................................................................................................................... Example ........................................................................................................................................... .......................................................................................................................................................... [2] (b) A student writes an algorithm to input two numbers and add them together to create a total. If the total is between 10 and 20 inclusive, "success" is output. If the total is not between 10 and 20 inclusive, "warning" is output. 01 num1 = input("Enter a number") 02 num2 = input("Enter a number") 03 total = num1 + num1 04 if total >= 10 then 05 print("success") 06 else 07 print("warning") 08 endif The algorithm does not work correctly. Identify the line number of the two logic errors in the algorithm and refine the code to correct each logic error. Line number ..................................................................................................................................... Correction ......................................................................................................................................... .......................................................................................................................................................... Line number ...................................................................................................................................... Correction ......................................................................................................................................... .......................................................................................................................................................... [4] © OCR 2024 Turn over 4 (c) (i) Show how a binary search will be

FAQs

What is Section A mainly focused on in this exam paper?

Section A focuses on computational thinking tasks such as identifying programming constructs, completing and correcting algorithms and flowcharts, and applying search, sorting, input/output, defensive design, and Boolean logic concepts.

How is the odd/even algorithm question structured?

It describes an algorithm using modular arithmetic and provides incomplete flowchart statements; you must complete the missing parts so the program outputs the correct result for odd and even numbers.

What kinds of mistakes are students asked to identify in the logic error question?

Students are asked to identify two logic errors by line number and then refine the code to correct each issue so the algorithm produces the required outputs for totals between 10 and 20 inclusive.

Sep 5, 2026

Upload by Ophelia