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MCQs

Total Questions : 91 | Page 5 of 10 pages
Question 41. Secondary treatment uses __________ to consume wastes.
  1.    micro-organisms
  2.    chemicals
  3.    filtration
  4.    none of these
 Discuss Question
Answer: Option A. -> micro-organisms
Answer: (a).micro-organisms
Question 42. Permanent hard water may be softened by passing it through
  1.    sodium silicate
  2.    sodium bicarbonate
  3.    sodium hexametaphosphate
  4.    sodium phosphate
 Discuss Question
Answer: Option C. -> sodium hexametaphosphate
Answer: (c).sodium hexametaphosphate
Question 43.  The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
  1.    0.05 mg/l
  2.    0.09 mg/l
  3.    0.1 mg/l
  4.    1.0 mg/l
 Discuss Question
Answer: Option A. -> 0.05 mg/l
Question 44.  Conventional tertiary treatment is
  1.    chemical coagulation and flocculation
  2.    filtration
  3.    sedimentation
  4.    none of these
 Discuss Question
Answer: Option A. -> chemical coagulation and flocculation
Question 45.  Zeolite softening process removes
  1.    only temporary hardness of water
  2.    only permanent hardness of water
  3.    both temporary and permanent hardness of water
  4.    the dissolved gases in permanent hard water
 Discuss Question
Answer: Option C. -> both temporary and permanent hardness of water
Question 46.  The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
  1.    600 ppm
  2.    300 ppm
  3.    500 ppm
  4.    1000 ppm
 Discuss Question
Answer: Option B. -> 300 ppm
Question 47.  The chemical oxygen demand (COD)measures the
  1.    amount of oxygen required for growth of microorganisms in water
  2.    amount of oxygen that would be removed from the water in order to oxidize pollution
  3.    amount of oxygen required to oxidize the calcium present in waste water
  4.    none of the above
 Discuss Question
Answer: Option B. -> amount of oxygen that would be removed from the water in order to oxidize pollution
Question 48.  Hardness of water does not
  1.    have any bad effect in boiler
  2.    make cooking of foods difficult
  3.    make it unfit for drinking
  4.    cause difficulty in the washing of clothes with soaps
 Discuss Question
Answer: Option C. -> make it unfit for drinking
Question 49.  
Permanent hard water may be softened by passing it through
  1.    sodium silicate
  2.    sodium bicarbonate
  3.    sodium hexametaphosphate
  4.    sodium phosphate
 Discuss Question
Answer: Option C. -> sodium hexametaphosphate
Question 50.  
Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
  1.    10% calcium chloride solution
  2.    10% magnesium sulfate solution
  3.    10% magnesium chloride solution
  4.    10% sodium chloride solution
 Discuss Question
Answer: Option D. -> 10% sodium chloride solution

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