1. Who invented Piano ?

Answer:

Bartolomeo Cristofori

2. Who invented Helicopter ?

Answer:

Igor Sikorsky

3. Who invented Printing Press ?

Answer:

Johannes Gutenberg

4. Who invented X-ray ?

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

5. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

6. Who invented Computer ?

Answer:

Charles Babbage

7. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913