1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

3. Who invented Automatic rifle ?

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

4. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

5. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

6. Who invented Nylon ?

Answer:

Wallace Carothers

7. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798