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MCQs

Total Questions : 181 | Page 16 of 19 pages
Question 151. What is the frequency of cleaning of a slow sand filter?
  1.    1 week
  2.    1-3 months
  3.    2-3 days
  4.    2-3 weeks
 Discuss Question
Answer: Option B. -> 1-3 months
Answer: (b).1-3 months
Question 152. The finer the suspended impurities to be removed ___________
  1.    Larger will be the sand size
  2.    Smaller will be the sand size
  3.    Smaller will be the surface area of sand grains
  4.    Narrow will be the sand depth of the bed
 Discuss Question
Answer: Option B. -> Smaller will be the sand size
Answer: (b).Smaller will be the sand size
Question 153. The depth of an enclosed tank of a rapid sand filter lies in the range of ______
  1.    1-2m
  2.    2.5-3.5m
  3.    2-5m
  4.    3-5m
 Discuss Question
Answer: Option B. -> 2.5-3.5m
Answer: (b).2.5-3.5m
Question 154. The effective size of a rapid sand filter is ______
  1.    0.45mm
  2.    0.7mm
  3.    0.8mm
  4.    0.9mm
 Discuss Question
Answer: Option A. -> 0.45mm
Answer: (a).0.45mm
Question 155. What is the maximum filter head up to which slow sand filters are worked upon?
  1.    25cm
  2.    50cm
  3.    75cm
  4.    100cm
 Discuss Question
Answer: Option C. -> 75cm
Answer: (c).75cm
Question 156. Consider the following statement.
i. The penetration of suspended matter is deep in the slow sand filter
ii. The penetration of suspended matter is superficial in the rapid sand filter
iii. Coagulation is not required in the slow sand filter
Which of the above statement is/are correct?
  1.    Only iii
  2.    i, ii
  3.    i, ii, iii
  4.    ii, iii
 Discuss Question
Answer: Option A. -> Only iii
Answer: (a).Only iii
Question 157. The filter run in rapid sand filter should not be less than _____ hours.
  1.    1
  2.    6
  3.    12
  4.    24
 Discuss Question
Answer: Option D. -> 24
Answer: (d).24
Question 158. Consider the following statement.
i. The slow sand filter is not efficient in removing turbidity
ii. The slow sand filter has a high initial cost
iii. Skilled supervision is required in slow sand filter
Which of the above statement is/are correct?
  1.    Only iii
  2.    i, ii
  3.    i, ii, iii
  4.    ii, iii
 Discuss Question
Answer: Option B. -> i, ii
Answer: (b).i, ii
Question 159. Consider the following statement.
i. Slow sand filter is not flexible in variation in demand
ii. The rapid sand filter is flexible in fluctuations in demand
iii. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
  1.    i, ii
  2.    i, ii, iii
  3.    ii, iii
  4.    Only iii
 Discuss Question
Answer: Option A. -> i, ii
Answer: (a).i, ii
Question 160. Rapid sand filters are very efficient in removal of color.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True

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