1. Who invented paper ?

Answer:

Cai Lun

2. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

3. Who invented Nylon ?

Answer:

Wallace Carothers

4. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

5. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

6. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

7. Who invented Helicopter ?

Answer:

Igor Sikorsky