1. Who invented X-ray ?

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

2. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

3. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

4. Who invented Transistor ?

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

5. Who invented Atomic Bomb ?

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

6. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

7. Who invented Laser ?

Answer:

Charles H. Townes