1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

3. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

4. Who invented Submarine ?

Answer:

John Philip Holland

5. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Vitamin K ?

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