Computer Science quiz

More questions about Computer Science

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which two digits form the foundation of the binary number system?

   Answer: 0 and 1

   Why: Leibniz first wrote about binary arithmetic in 1679, and his 1703 paper tied it to the ancient Chinese I Ching hexagrams.

2. 2 Medium

   Why was the security test CAPTCHA originally invented?

   Answer: To distinguish humans from computers

   Why: The name is an acronym, and the same idea was later turned into free labour that digitised old books and taught machines to read street signs.

3. 3 Hard

   Approximately what percentage of the world's money exists only on computers?

   Answer: 92%

   Why: The Bank of England says most of the money in the modern economy is created by commercial banks making loans.

4. 4 Easy

   What typically causes a stack overflow error?

   Answer: Missing a base case in recursion

   Why: Python limits recursion depth to keep infinite recursive calls from overflowing its underlying C stack.

5. 5 Medium

   What creature was taped into a 1947 logbook as the first bug?

   Answer: A moth

   Why: The engineers were joking about a word Edison had already used in 1878, so it is the first bug found rather than the first bug named.

6. 6 Hard

   Who is widely considered the world's first computer programmer?

   Answer: Ada Lovelace

   Why: She wrote notes on a machine that was never built, and the last of them describes how it would calculate a sequence of numbers.