1. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

2. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

3. Who invented Hydrogen bomb ?

Answer:

Edward Teller

4. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

5. Who invented Atomic Bomb ?

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

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm