1. Who invented Piano ?

Answer:

Bartolomeo Cristofori

2. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

3. Who invented by Electric Lamp ?

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

4. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

5. Who invented Proton ?

Answer:

Ernest Rutherford

6. Who invented Vitamin A ?

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

7. Who invented Nylon ?

Answer:

Wallace Carothers