1. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

2. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

3. Who invented DNA Structure ?

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

4. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

5. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm