1. Who invented Transistor ?

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

2. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

3. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Floppy disk ?

Answer: IBM in 1970

6. Who invented Piano ?

Answer:

Bartolomeo Cristofori

7. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin