1. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

2. Who invented Hydrogen bomb ?

Answer:

Edward Teller

3. Who invented google ?

Answer:

Larry Page

4. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

5. Who invented Ball-Point Pen ?

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

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Helicopter ?

Answer:

Igor Sikorsky