1. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

2. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

3. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

4. Who invented X-ray ?

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

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

7. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.