1. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

2. Who invented Proton ?

Answer:

Ernest Rutherford

3. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

4. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

7. Who invented Transformer ?

Answer:

Ottó Bláthy