1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

4. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

5. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Computer ?

Answer:

Charles Babbage