1. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

2. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

3. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

4. Who invented X-ray ?

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

5. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

6. Who invented Computer ?

Answer:

Charles Babbage

7. Who invented Penicillin ?

Answer: Alexander Fleming of Britain in 1928.