1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Nylon ?

Answer:

Wallace Carothers

3. Who invented Vitamin D ?

Answer:

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

4. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

5. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

6. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

7. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.