General knowledge quiz

More questions about General knowledge

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

1. 1 Easy

   Why is outer space completely silent to human ears?

   Answer: Sound requires molecules to vibrate

   Why: Space is not a perfect vacuum: in the Perseus cluster NASA's Chandra found sound waves in the hot gas, a B flat 57 octaves below middle C.

2. 2 Medium

   What was the subject of the first YouTube video?

   Answer: A visit to the zoo

   Why: It runs nineteen seconds, was posted on 23 April 2005 by a co-founder, and was filmed by a school friend.

3. 3 Hard

   What was the first item ever sold on eBay?

   Answer: A broken laser pointer

   Why: Pierre Omidyar listed it just to test his new site, and it went for $14.83 to a buyer who said he was a collector of broken laser pointers.

4. 4 Easy

   What type of astronomical body sits at the very center of our solar system?

   Answer: A star

   Why: The Sun contains more than 99.8% of the total mass in the entire solar system.

5. 5 Medium

   What triggered the sudden collapse of Tulip Mania in 1637?

   Answer: Buyers refused to pay

   Why: Dutch courts enforced no tulip contract, the trade counting as banned gambling; from May 1638 Haarlem let buyers cancel for 3.5 percent.

6. 6 Hard

   Which named effect claims that hot water can freeze faster than cold water?

   Answer: Mpemba effect

   Why: Mpemba was a 13-year-old making ice cream in 1963 when he noticed it, and physicists still argue over whether it happens in plain water.