1. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

2. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

3. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

4. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

5. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

6. Who invented Submarine ?

Answer:

John Philip Holland

7. Who invented Radar ?

Answer:

Sir Robert Watson-Watt