1. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

2. Who invented Helicopter ?

Answer:

Igor Sikorsky

3. Who invented Laser ?

Answer:

Charles H. Townes

4. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

5. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

6. Who invented Floppy disk ?

Answer: IBM in 1970

7. Who invented Safety razor ?

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