1. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

2. Who invented Hydrogen bomb ?

Answer:

Edward Teller

3. Who invented X-ray ?

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

4. Who invented Safety Pin ?

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

5. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

6. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

7. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903