1. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

2. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

3. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

4. Who invented Java Language ?

Answer:

James Gosling

5. Who invented Calculus ?

Answer: Newton of Britain in 1670.

6. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.