1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

3. Who invented X-ray ?

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

4. Who invented DNA Structure ?

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

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

7. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.