1. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

2. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

3. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

4. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

5. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

6. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

7. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.