1. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

2. Who invented DNA Structure ?

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

3. Who invented Vitamin A ?

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

4. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

5. Who invented Vitamin K ?

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

6. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

7. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504