1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

3. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

4. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

5. Who invented by Electric Lamp ?

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

6. Who invented Piano ?

Answer:

Bartolomeo Cristofori

7. Who invented Transistor ?

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