1. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

2. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

3. Who invented paper ?

Answer:

Cai Lun

4. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

5. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

6. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

7. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.