1. Who invented Vitamin A ?

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

2. Who invented Radiocarbon ?

Answer:

Willard Libby

3. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

4. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

5. Who invented by Electric Lamp ?

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

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644