1. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

2. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

3. Who invented by Electric Lamp ?

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

4. Who invented Helicopter ?

Answer:

Igor Sikorsky

5. Who invented X-ray ?

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

6. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

7. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.