1. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

2. Who invented Hydrogen bomb ?

Answer:

Edward Teller

3. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

6. Who invented Submarine ?

Answer:

John Philip Holland

7. Who invented Vitamin A ?

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