1. Who invented X-ray ?

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

2. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.

3. Who invented paper ?

Answer:

Cai Lun

4. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

5. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951

6. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

7. Who invented Stethoscope ?

Answer: Laennec of French in 1819.