Input Validation — 20 Exam-Style Questions

20 exam-style questions on input validation for OCR GCSE Computer Science (J277/02), with full answers and guidance.
Covers all six validation check types tested by OCR — range, type, presence, length, format, and lookup list — with questions modelled on the style and command words used in actual J277 papers: complete the table, identify the error, explain, evaluate, and a scenario-based justify question worth 4 marks.
Includes:

40 marks across 20 questions, split into three progressive sections
Scenario questions with data tables, matching the real exam format
Answers written for students, not teachers — no “award 1 mark” language
Watch out boxes targeting the specific misconceptions flagged in OCR examiner reports (particularly the confusion between validation and accuracy, and between check types)
Stretch & challenge questions to deepen understanding without going beyond the spec

Print-ready and suitable for independent revision, structured practice, or classroom use.