16) If mercury in a barometer is replaced by water, the height of 2 cm of mercury will be following _____ cm of water

17) A pressure of 25 m of head of water is equal to

18) An odd shaped body weighing 7.5 kg and occupying 0.01 cubic meter volume will be completely submerged in a fluid having specific gravity of

19) Heat flows from one body to other body when they have

20) Which of the following has maximum value of thermal conductivity?