1. Who invented Vitamin K ?

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

2. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

3. Who invented Floppy disk ?

Answer: IBM in 1970

4. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

5. Who invented Vitamin A ?

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

6. Who invented Radiocarbon ?

Answer:

Willard Libby

7. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504