1. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

2. Who invented X-ray ?

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

3. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

4. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

5. Who invented c language

Answer:

Dennis Ritchie

6. Who invented HIV ?

Answer:

7. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903