1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Transistor ?

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

3. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

4. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

5. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

6. Who invented Morphine ?

Answer: Friderich Sertumer of Germany in 1805

7. Who invented Computer ?

Answer:

Charles Babbage