1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

3. Who invented Floppy disk ?

Answer: IBM in 1970

4. Who invented Automatic rifle ?

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

5. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

6. Who invented Submarine ?

Answer:

John Philip Holland

7. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805