1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

6. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

7. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805