1. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

2. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

3. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

6. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

7. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849