500 Best Environmental Engineering- MCQ
Q109). After cleaning the slow sand filter, the filtered water should not be used for a period of
a).Upto 6 hours
b).6 hours to 12 hours
c).12 hours to 24 hours
d).24 hours to 48 hours
Correct Answer:
24 hours to 48 hours
Explanation:
Q110). Cleaning period of a slow sand filter is taken as
a).1 hour to 3 hours
b).1 day to 3 days
c).1 week to 3 weeks
d).1 month to 3 months
Correct Answer:
1 month to 3 months
Explanation:
Q111). Rate of filteration of a slow sand filter ranges from
a).10 to 100 l/h/m2
b).100 to 200
c).200 to 400
d).400 to 1000
Correct Answer:
100 to 200
Explanation:
Q112). Slow sand filter is efficient to remove the bacterias from the raw water to an extent of
a).0.5
b).0.7
c).0.85
d).0.99
Correct Answer:
0.99
Explanation:
Q113). Slow sand filter is more efficient for the removal of
a).Bacteria
b).Odour
c).Turbidity
d).All of these
Correct Answer:
Bacteria
Explanation:
Q114). In a rapid sand filter
a).Raw water from the source is supplied
b).Disinfected raw water is supplied
c).Raw water passed through coagulation tank is supplied
d).Any one of the above
Correct Answer:
Raw water passed through coagulation tank is supplied
Explanation:
Q115). The yield of a rapid sand filter is ………… to that of slow sand filter
a).10 times
b).15 times
c).20 times
d).30 times
Correct Answer:
30 times
Explanation:
Q116). An arrangement for back washing is provided in
a).Slow sand filter
b).Sedimentation tank
c).Rapid sand filter
d).All of these
Correct Answer:
Rapid sand filter
Explanation: