1. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

2. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

3. Who invented Calculus ?

Answer: Newton of Britain in 1670.

4. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

5. Who invented Safety razor ?

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

6. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

7. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen