1. Who invented paper ?

Answer:

Cai Lun

2. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

3. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

4. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

5. Who invented Hydrogen bomb ?

Answer:

Edward Teller

6. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

7. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798