1. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

2. Who invented Hydrogen bomb ?

Answer:

Edward Teller

3. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

4. Who invented Floppy disk ?

Answer: IBM in 1970

5. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

6. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

7. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland