1. Who invented Transistor ?

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

2. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

3. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

4. Who invented Helicopter ?

Answer:

Igor Sikorsky

5. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

6. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

7. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany