1. Who invented Atomic Bomb ?

Answer: J. Robert Oppenheimer of U.S.A. in 1945

2. Who invented Vitamin A ?

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

3. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

4. Who invented Calculus ?

Answer: Newton of Britain in 1670.

5. Who invented Submarine ?

Answer:

John Philip Holland

6. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

7. Who invented HIV ?

Answer: