1. Who invented paper ?

Answer:

Cai Lun

2. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

3. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

4. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

5. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

6. Who invented Calculus ?

Answer: Newton of Britain in 1670.

7. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.