1. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

2. Who invented Helicopter ?

Answer:

Igor Sikorsky

3. Who invented Proton ?

Answer:

Ernest Rutherford

4. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

5. Who invented Piano ?

Answer:

Bartolomeo Cristofori

6. Who invented Automatic rifle ?

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

7. Who invented Ball-Point Pen ?

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