1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.

3. Who invented Helicopter ?

Answer:

Igor Sikorsky

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

6. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

7. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table