1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

3. Who invented HIV ?

Answer:

4. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

5. Who invented Transistor ?

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

6. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

7. Who invented paper ?

Answer:

Cai Lun