1. Who invented Nylon ?

Answer:

Wallace Carothers

2. Who invented Piano ?

Answer:

Bartolomeo Cristofori

3. Who invented Safety Pin ?

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

4. Who invented Transistor ?

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

5. Who invented Laser ?

Answer:

Charles H. Townes

6. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

7. Who invented Atomic numbers ?

Answer: Moseley of Britain in 1913