1. Who invented Vitamin A ?

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

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

4. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

5. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

6. Who invented Morphine ?

Answer: Friderich Sertumer of Germany in 1805

7. Who invented Radar ?

Answer:

Sir Robert Watson-Watt