1. Who invented Hydrogen bomb ?

Answer:

Edward Teller

2. Who invented Laser ?

Answer:

Charles H. Townes

3. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

4. Who invented HIV ?

Answer:

5. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948