1. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented Hydrogen bomb ?

Answer:

Edward Teller

4. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

5. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

6. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

7. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747