299) A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

300) A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.

301) A nozzle is generally made of

302) The unit of surface tension is

303) A notch is, usually, made of a metallic plate.