1. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

2. Who invented X-ray ?

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

3. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

4. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

5. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

6. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

7. Who invented Floppy disk ?

Answer: IBM in 1970