1. Who invented by Electric Lamp ?

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

2. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

3. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

4. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

5. Who invented Super Computer ?

Answer:

Seymour Cray

6. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

7. Who invented Submarine ?

Answer:

John Philip Holland