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MCQs

Total Questions : 828 | Page 9 of 83 pages
Question 81. The suitable method for disinfection of swimming pool water is
  1.    Ultra violet rays treatment
  2.    Lime treatment
  3.    By using potassium permanganate
  4.    Chlorination
 Discuss Question
Answer: Option A. -> Ultra violet rays treatment
Question 82. Disinfection efficiency is
  1.    Reduced at higher pH value of water
  2.    Unaffected by pH value of water
  3.    Increased at higher pH value of water
  4.    Highest at pH value equal to 7
 Discuss Question
Answer: Option A. -> Reduced at higher pH value of water
Question 83. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
  1.    Less and more
  2.    Less and less
  3.    More and less
  4.    More and more
 Discuss Question
Answer: Option C. -> More and less
Question 84. The time of concentration is defined as
  1.    The time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
  2.    The time required for flow of water in sewer to the point under consideration
  3.    Sum of (A) and (B)
  4.    Difference of (A) and (B)
 Discuss Question
Answer: Option C. -> Sum of (A) and (B)
Question 85. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
  1.    House sewer
  2.    Lateral sewer
  3.    Main sewer
  4.    Sub-main sewer
 Discuss Question
Answer: Option A. -> House sewer
Question 86. The velocity of flow of water in a sedimentation tank is about
  1.    5 to 10 cm/sec
  2.    15 to 30 cm/sec
  3.    15 to 30 cm/minute
  4.    15 to 30 cm/hour
 Discuss Question
Answer: Option C. -> 15 to 30 cm/minute
Question 87. Hardy cross method of analysis of distribution system (i) Involves successive trials (ii) Takes economic aspects into account (iii) Is time consuming
  1.    Only (i)
  2.    (i) and (ii)
  3.    (i) and (iii)
  4.    All are correct
 Discuss Question
Answer: Option C. -> (i) and (iii)
Question 88. The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)
  1.    At a distance R from the well
  2.    Close to the well
  3.    At a distance R/2 from the well
  4.    None of the above
 Discuss Question
Answer: Option B. -> Close to the well
Question 89. The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
  1.    Separate system
  2.    Combined system
  3.    Partially separate system
  4.    Partially combined system
 Discuss Question
Answer: Option B. -> Combined system
Question 90. In lime-soda process
  1.    Only carbonate hardness is removed
  2.    Only noncarbonated hardness is removed
  3.    Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
  4.    Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness
 Discuss Question
Answer: Option C. -> Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness

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