1. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

2. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

3. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

4. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

5. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

6. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

7. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams