1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

3. Who invented Morphine ?

Answer: Friderich Sertumer of Germany in 1805

4. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

5. Who invented Helicopter ?

Answer:

Igor Sikorsky

6. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

7. Who invented Piano ?

Answer:

Bartolomeo Cristofori