1. Who invented Floppy disk ?

Answer: IBM in 1970

2. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

3. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

4. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

5. Who invented Calculus ?

Answer: Newton of Britain in 1670.

6. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

7. Who invented Proton ?

Answer:

Ernest Rutherford