1. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

2. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

3. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

4. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

5. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

6. Who invented Helicopter ?

Answer:

Igor Sikorsky

7. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912