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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

Decimal, Binary & Hexadecimal Flashcards

All 7 cards in this deck

What is binary?: A number system containing two symbols, 0 and 1, also known as base 2.
Why do computers store and process all data in binary?: They work with electrical signals that are either on or off, which match the two binary digits 1 and 0.
What do computers use binary to represent?: All data and instructions. Text, images and sound must all be converted into binary before a computer can store or process them.
What is hexadecimal?: A base 16 number system using the digits 0–9 and the letters A–F.
What decimal values do the hex digits A and F represent?: A = 10 and F = 15.
What decimal values do the hex digits B, C, D and E represent?: B = 11, C = 12, D = 13 and E = 14. (A = 10 and F = 15.)
What is decimal?: A base 10 number system that uses the ten digits 0–9. It is the number system people use every day.