1. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

2. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

3. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

6. Who invented HIV ?

Answer:

7. Who invented Safety Pin ?

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