1. Who invented Vitamin A ?

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

2. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

3. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

4. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

5. Who invented Safety razor ?

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

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist