1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

3. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

4. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

5. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

6. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

7. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902