119) In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

120) When the coefficient of discharge (C_d) is 0.623, then the general equation for discharge over a rectangular weir is

121) The total energy line lies over the centre line of the pipe by an amount equal to

122) A piezometer tube is used only for measuring

123) The flow in a pipe is turbulent when Reynold number is