1. Who invented Safety Pin ?

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

2. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922

3. Who invented Chloroform as anaesthetic ?

Answer: James Simpson of Britain in 1847.

4. Who invented Transformer ?

Answer:

Ottó Bláthy

5. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

6. Who invented Atomic Bomb ?

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

7. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698