Q.

Which of the following materials is not used in the construction of a septic tank?

A. concrete
B. rubber
C. fibreglass
D. plastic
Answer» B. rubber
Explanation: a septic tank is a watertight chamber made of brick-work, concrete, fiberglass, pvc or plastic, through which black water from the cistern or pour-flush toilets and grey water through a pipe from inside a building or an outside toilet flows for primary treatment.
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