1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

3. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

4. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

5. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

6. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

7. Who invented Laser ?

Answer:

Charles H. Townes