311) An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.

312) The reciprocal of Euler's number is called Newton number.

313) Bulk modulus of a fluid is the ratio of

314) The pressure at a point 4 m below the free surface of water is

315) A structure used to dam up a stream or river over which the water flows is called