Q: The sewerage system consists of

(a) :  house sewer
(b) :  lateral sewer
(c) :  branch sewer
(d) :  main sewer
(e) :  all of these.
Answer:  all of these.

Q: Which one of the following statements regarding septic tanks is wrong :

(a) :  a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
(b) :  the outlet invert level is kept 5 to 7.5 cm below the inlet invert level
(c) :  the minimum width of septic level is 90 cm
(d) :  the depth of tank is kept equal to its width.
(e) :  None of these
Answer:  the depth of tank is kept equal to its width.

Q: Aerobic activity is maximum

(a) :  in freshly produced sewage
(b) :  at sewer pipes
(c) :  in sewer treatment plants
(d) :  all of these
(e) :  None of these
Answer:  in freshly produced sewage

Q: The sewer which transports the sewage to the point of treatment, is called

(a) :  house sewer
(b) :  out-fall sewer
(c) :  branch sewer
(d) :  lateral
(e) :  main sewer.
Answer:  out-fall sewer

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