1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

3. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

4. Who invented Ballistic missile ?

Answer: Wemher von Braun of Germany in 1944.

5. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

6. Who invented Calculus ?

Answer: Newton of Britain in 1670.

7. Who invented Automatic rifle ?

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