1. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Submarine ?

Answer:

John Philip Holland

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Calculus ?

Answer: Newton of Britain in 1670.

6. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

7. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644