1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

3. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

4. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

5. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

6. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

7. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698