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Memory & StorageMedium Exam FrequencyOCR

Compression

Revise Compression in Memory & Storage for GCSE Computer Science with 15 exam-style questions and 16 flashcards. This topic appears regularly enough that it should be part of a solid GCSE revision cycle.

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1

The Travel Packing Problem

Introduction2

Deep Dive: Why Compression Matters

Deep Dive3

Lossless Compression - Perfect Recreation

Key Facts4

Run-Length Encoding (RLE) - Simple Lossless

Key Facts5

Dictionary-Based Compression (LZW)

Key Facts6

Lossy Compression - Good Enough Quality

Key Facts7

How Lossy Compression Works

Key Facts8

Lossless vs Lossy Compression

Comparison9

Real-World Example: Photo Sharing

Deep Dive10

Exam Tips - Compression

Exam Tips11

Quick Reference - Compression

Key Facts

Sample Flashcards

Sample Questions

Which statement correctly describes lossy compression?

  • A. The original file can be perfectly restored after decompression.
  • B. Data is permanently removed and the original cannot be exactly recreated.
  • C. The compressed file is always the same size as the original.
  • D. No data is removed during the compression process.
1 markfoundation

Explain how run-length encoding (RLE) works to compress data.

3 marksstandard

15

exam-style questions

16

revision flashcards

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