1. Who invented X-ray ?

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

2. Who invented Logarithms ?

Answer:

John Napier (Scotland) invented Logarithm

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 Printing Press ?

Answer:

Johannes Gutenberg

6. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

7. Who invented Computer ?

Answer:

Charles Babbage