1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

3. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

4. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

7. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805