1. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

4. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

5. Who invented Laser ?

Answer:

Charles H. Townes

6. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

7. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832