OCR - A level Computer Science Quiz - Topic 1.3.1

OCR A Level Computer Science H446 – Topic 1.3.1 Quiz: Compression, Encryption and Hashing

Make revision engaging and competitive with this interactive PowerPoint quiz for OCR A Level Computer Science H446, Unit 1, Topic 1.3.1 – Compression, Encryption and Hashing.

The quiz contains 20 multiple-choice questions covering the key knowledge students need for the OCR specification, including:

• Lossy and lossless compression
• Run-length encoding
• Dictionary-based compression
• Reasons for compressing files
• Symmetric and asymmetric encryption
• Public and private keys
• Digital signatures
• The purpose of hashing
• Characteristics of a good hashing algorithm
• Password storage using hashes
• Collisions and salting

Interactive features

• Editable team names
• Automatic team score calculation
• Macro buttons for awarding points
• Countdown timer for each question
• Music during each countdown
• Dedicated answer and explanation slides
• Round summary slides
• Final leaderboard
• Exam-style tie-breaker question

This resource is ideal for:

• Whole-class revision
• End-of-topic assessment
• Retrieval practice
• Starter or plenary activities
• Exam preparation
• Intervention and booster sessions
• Year 12 or Year 13 Computer Science lessons

The answer slides include clear explanations, helping students correct misconceptions and develop their understanding of key technical terminology.

The quiz is supplied as a macro-enabled PowerPoint file (.pptm). It should be opened using the desktop version of Microsoft PowerPoint, and users must select Enable Content for the automatic scoring buttons to function correctly.

A fun, ready-to-use revision activity that encourages discussion, teamwork and active recall while covering the essential content of OCR H446 Topic 1.3.1.