1. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

2. Who invented Automatic rifle ?

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

3. Who invented Floppy disk ?

Answer: IBM in 1970

4. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

5. Who invented paper ?

Answer:

Cai Lun

6. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

7. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951