1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Vitamin K ?

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

3. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor

4. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

5. Who invented HIV ?

Answer:

6. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

7. Who invented Vitamin A ?

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