1. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

2. Who invented Piano ?

Answer:

Bartolomeo Cristofori

3. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

6. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

7. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879