1. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

2. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

3. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

6. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

7. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922