1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

3. Who invented by Electric Lamp ?

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

4. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

5. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

6. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

7. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor