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Computer Science

GCSE · AQA

QuestionsFlashcards

Cyber Security Threats
Social Engineering
- What Social Engineering Is
  4
- Blagging, Phishing & Shouldering
  5
Malware
- What Malware Is
  2
- Viruses, Trojans & Spyware
  3
Detecting & Preventing Threats

Character Encoding 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 can represent a far greater range of characters, including the alphabets of many languages and special symbols such as emoji.
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 that character codes run in sequence? e.g. 'A' has the code 65: Letters are given consecutive codes in order, so 'B' is 66 and 'C' is 67. Lower-case letters and digits also run in sequence.
How do the first 128 character codes of Unicode relate to ASCII?: They are the same: Unicode uses the same codes as ASCII for codes 0 to 127.