1. Who invented Atomic Bomb ?

Answer: J. Robert Oppenheimer of U.S.A. in 1945

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Calculus ?

Answer: Newton of Britain in 1670.

4. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

5. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

6. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

7. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland