51) The standard length of stoneware pipe excluding its socket is

52) Which distribution system is most suitable for cities which are growing irregularly?

53) For achieving self cleaning velocity, 150 mm dia pipe should have a slope of

54) What is the meaning of the word Plumbum?

55) The inlet valve of a water tank of capacity 18 m3 is set at a flow rate of 0.3 litres /sec. The time required to fill the tank is