1. Who invented X-ray ?

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

2. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

3. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Piano ?

Answer:

Bartolomeo Cristofori

6. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

7. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628