1. Who invented Transistor ?

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

2. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

3. Who invented Helicopter ?

Answer:

Igor Sikorsky

4. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

5. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

6. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

7. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504