1. Who invented Helicopter ?

Answer:

Igor Sikorsky

2. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

3. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

4. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

5. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

6. Who invented Safety Pin ?

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

7. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932