1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

3. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

6. Who invented DNA Structure ?

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

7. Who invented Floppy disk ?

Answer: IBM in 1970