What did mathematician John Napier invent?

1. What term is used to define Examination of organs of a dead body?
Biopsy
Limnology
anatomy
Autopsy

Ans: Autopsy

2. What metal impurity makes rubies red and emeralds green?
Chromium
Copper
Crocoite
All of the above

Ans: Chromium

3. Which is the longest river in Italy?
River Douro
River Po
River Tagus
River Don

Ans: River Po

4. What did mathematician John Napier invent?
Algebra
Arithmetics
Logarithms
Algorithm

Ans: Logarithms

5. Where was held the World Scrabble Championship in November?
Indonesia
Singapore
Malaysia
Canada

Ans: Malaysia