187) The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ? = Density of the fluid)

188) The pressure intensity in kN/m² (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

189) The hydraulic gradient line is always parallel to the centre line of the pipe.

190) Barometer is used to measure

191) A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.