41) Water consumption per captia, per day, for domestic purpose, as per Indian Standard is

42) As per IS:10500 for drinking water standards, the acceptance limit of pH value is

43) As per IS:10500 for drinking water standards, the acceptable limit of Turbidity, NTU, max is

44) A water tank of size 1.5 cubic meters can hold water of quantity

45) Pipe wrench is used for