1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

3. Who invented Safety Pin ?

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

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented HIV ?

Answer:

6. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

7. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932