304) In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free.

305) A channel is said to be of most economical cross-section, if

306) The top of the weir over which the water flows is known as

307) A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

308) The specific gravity of water is taken as