CPU 20 Exam Style Questions

20 exam-style questions on the CPU for OCR GCSE Computer Science (J277/01), with full answers and guidance — free to download.
Covers CPU components and registers (ALU, CU, MAR, MDR, PC, accumulator), the fetch-execute cycle, and CPU performance characteristics (clock speed, number of cores, cache size), with questions modelled on the style and command words used in actual J277 papers: complete the table, identify the error, describe, 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
Stretch & challenge questions to deepen understanding without going beyond the spec

This is the first resource in a growing series covering the full J277 specification. If it works for your students, the same format and quality is available across other key topics including Storage, Network Security, Input Validation, and Operating Systems.