1. Who invented Vitamin A ?

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

2. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

3. Who invented Helicopter ?

Answer:

Igor Sikorsky

4. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

7. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.