1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

3. Who invented Proton ?

Answer:

Ernest Rutherford

4. Who invented Atomic Bomb ?

Answer: J. Robert Oppenheimer of U.S.A. in 1945

5. Who invented Nylon ?

Answer:

Wallace Carothers

6. Who invented HIV ?

Answer:

7. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798