1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented paper ?

Answer:

Cai Lun

6. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

7. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765