1. Who invented Transistor ?

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

2. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

3. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

4. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Helicopter ?

Answer:

Igor Sikorsky

7. Who invented Radar ?

Answer:

Sir Robert Watson-Watt