1. Who invented HIV ?

Answer:

2. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

3. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

4. Who invented Safety Pin ?

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

5. Who invented Laser ?

Answer:

Charles H. Townes

6. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

7. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.