1. Who invented Calculus ?

Answer: Newton of Britain in 1670.

2. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

3. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

4. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

5. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

6. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

7. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683