1. Who invented Vitamin K ?

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

2. Who invented Transistor ?

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

3. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

4. Who invented Computer ?

Answer:

Charles Babbage

5. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

6. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

7. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.