1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

3. Who invented paper ?

Answer:

Cai Lun

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Floppy disk ?

Answer: IBM in 1970

6. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

7. Who invented Helicopter ?

Answer:

Igor Sikorsky