1. Who invented Vitamin K ?

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

2. Who invented Safety Pin ?

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

3. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

4. Who invented Atomic Bomb ?

Answer: J. Robert Oppenheimer of U.S.A. in 1945

5. Who invented Ball-Point Pen ?

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

6. Who invented Printing Press ?

Answer:

Johannes Gutenberg

7. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644