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MCQs

Total Questions : 86 | Page 5 of 9 pages
Question 41. How much time does take for Mercury to leave the body?
  1.    2 months
  2.    2 years
  3.    18 months
  4.    18 years
 Discuss Question
Answer: Option D. -> 18 years
Answer: (d).18 years
Question 42. Organic and inorganic contaminants can be removed by physical and chemical methods.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 43. The physical and chemical methods of treating waste water are efficient yet costly.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 44. The secondary pollution problem is a major concern caused due physical and or chemical purification techniques.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 45. Biological technique uses catabolic reactions of microorganisms.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 46. Which of the following technique is environment friendly and cost effective?
  1.    Biological
  2.    Chemical
  3.    Physical
  4.    Combination of physical and chemical
 Discuss Question
Answer: Option A. -> Biological
Answer: (a).Biological
Question 47. The decomposition of the organic compounds leads conversion of released minerals into usable biomass.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 48. The biofilms can be engineered for bio degradation and bio transformation.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 49. Which of the following is the main source of eutrophication?
  1.    Effluent quality
  2.    Nitrogen
  3.    Salty water
  4.    Pure water
 Discuss Question
Answer: Option B. -> Nitrogen
Answer: (b).Nitrogen
Question 50. Which of the following methods can be used to separate phosphates from insoluble precipitates?
  1.    Sedimentation
  2.    Temperature
  3.    pH
  4.    Volume
 Discuss Question
Answer: Option A. -> Sedimentation
Answer: (a).Sedimentation

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