1. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

2. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

3. Who invented Piano ?

Answer:

Bartolomeo Cristofori

4. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

5. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

6. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

7. Who invented Atomic Bomb ?

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