1. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

2. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

3. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

4. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

5. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

6. Who invented Ball-Point Pen ?

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

7. Who invented Java Language ?

Answer:

James Gosling