1. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

2. Who invented by Electric Lamp ?

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

3. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

4. Who invented Hydrogen bomb ?

Answer:

Edward Teller

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

7. Who invented Piano ?

Answer:

Bartolomeo Cristofori