1. Who invented X-ray ?

Answer: W.K. Roentgen of Germany in 1895.

2. Who invented Laser ?

Answer:

Charles H. Townes

3. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

6. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

7. Who invented Calculus ?

Answer: Newton of Britain in 1670.