1. Who invented Safety razor ?

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

2. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

3. Who invented Vitamin A ?

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

4. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

7. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany