1. Who invented Floppy disk ?

Answer: IBM in 1970

2. Who invented X-ray ?

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

3. Who invented Hydrogen bomb ?

Answer:

Edward Teller

4. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

5. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

6. Who invented Piano ?

Answer:

Bartolomeo Cristofori

7. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland