1. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

2. Who invented Printing Press ?

Answer:

Johannes Gutenberg

3. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

4. Who invented X-ray ?

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

5. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

6. Who invented Helicopter ?

Answer:

Igor Sikorsky

7. Who invented Piano ?

Answer:

Bartolomeo Cristofori