1. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

2. Who invented Floppy disk ?

Answer: IBM in 1970

3. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

4. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

5. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

6. Who invented Safety Pin ?

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

7. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903