1. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

2. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

3. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

4. Who invented Helicopter ?

Answer:

Igor Sikorsky

5. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

6. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

7. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm