1. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

2. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

3. Who invented Vitamin A ?

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

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

6. Who invented Transformer ?

Answer:

Ottó Bláthy

7. Who invented Calculus ?

Answer: Newton of Britain in 1670.