1. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

2. Who invented Submarine ?

Answer:

John Philip Holland

3. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913

4. Who invented Floppy disk ?

Answer: IBM in 1970

5. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Ball-Point Pen ?

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