1. Who invented Atomic Bomb ?

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

2. Who invented paper ?

Answer:

Cai Lun

3. Who invented X-ray ?

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

4. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

5. Who invented Printing Press ?

Answer:

Johannes Gutenberg

6. Who invented Hydrogen bomb ?

Answer:

Edward Teller

7. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903