1. Who invented Laser ?

Answer:

Charles H. Townes

2. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

3. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

4. Who invented Printing Press ?

Answer:

Johannes Gutenberg

5. Who invented Transformer ?

Answer:

Ottó Bláthy

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland