1. Who invented Vitamin A ?

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

2. Who invented Radiocarbon ?

Answer:

Willard Libby

3. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

6. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.