1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

3. Who invented Calculus ?

Answer: Newton of Britain in 1670.

4. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

5. Who invented c language

Answer:

Dennis Ritchie

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.