1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented Transistor ?

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

4. Who invented DNA Structure ?

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

5. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

6. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

7. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712