State True or False:
(i) Untreated sewage should be disposed of in reservoirs.
(ii) Residual oil and ghee should be drained.
(iii) Throwing polythene bags or pieces in the drains can choke the drain.
(iv) Litter should be thrown in the dustbin only.
(v) The solid settling at the bottom of a water purification tank is called sludge.