1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

3. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

4. Who invented by Electric Lamp ?

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

5. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

6. Who invented Calculus ?

Answer: Newton of Britain in 1670.

7. Who invented Vitamin A ?

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