1. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

2. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

3. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

4. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

5. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

6. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

7. Who invented Transistor ?

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