1. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

2. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

3. Who invented Submarine ?

Answer:

John Philip Holland

4. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

5. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Transistor ?

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