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Computer Science

GCSE · OCR

QuestionsFlashcards

Identifying & Preventing Threats to Computer Systems & Networks
- Forms of Attack on a Network
  8
- Methods of Preventing a Network Attack
  10

Operating Systems & Utility Software
- The Purpose & Functionality of Operating Systems
  7
- The Purpose & Functionality of Utility Software
  6

Ethical, Legal, Cultural & Environmental Impact
- Impacts of Digital Technology on Wider Society
  7
- Legislation in Computer Science
  8

Boolean Logic Diagrams
- Boolean Logic Diagrams
  9
- Combining Boolean Operators
  7

Representing Characters Flashcards

All 6 cards in this deck

What is a character set?: A collection of characters a computer recognises, each represented by a unique binary code.
How many bits per character does ASCII use, and how many characters can it represent?: 7 bits per character, representing 128 characters.
What is the advantage of Unicode over ASCII?: It uses more bits per character, so it can represent characters from many languages including emojis.
True or false? Storing the same text in Unicode gives a larger file than storing it in ASCII.: True. Unicode uses more bits per character.
How many characters can a character set with $n$ bits per character represent? e.g. 8 bits per character: $2^n$ characters.
e.g. 8 bits gives 256 characters.
What does it mean to say a character set is logically ordered? e.g. 'A' has the code 65: Characters are given consecutive codes in order, so 'B' is 66 and 'C' is 67.