Q: Flocculated particles do not change their

(a) :  size
(b) :  shape
(c) :  weight
(d) :  all of these
(e) :  None of these
Answer:  none of these

Q: Lead acetate test in sewer manhole is done to test the presence of

(a) :  Methane gas
(b) :  Hydrogen sulphide
(c) :  Carbondioxide gas
(d) :  Diesel vapours.
(e) :  None of these
Answer:  Hydrogen sulphide

Q: If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

(a) :  2 hours
(b) :  4 hours
(c) :  6 hours
(d) :  8 hours.
(e) :  None of these
Answer:  8 hours.

Q: The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is

(a) :  0.10 cumec
(b) :  0.12 cumec
(c) :  0.15 cumec
(d) :  0.20 cumec
(e) :  None of these
Answer:  0.15 cumec

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