1. Who invented X-ray ?

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

2. Who invented Proton ?

Answer:

Ernest Rutherford

3. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

4. Who invented Submarine ?

Answer:

John Philip Holland

5. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

6. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

7. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628