1. Who invented DNA Structure ?

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

2. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

3. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

4. Who invented Laser ?

Answer:

Charles H. Townes

5. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

6. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

7. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.