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MCQs

Total Questions : 186 | Page 7 of 19 pages
Question 61. The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer
  1.    greater
  2.    lesser
  3.    approximately equal to
  4.    half
 Discuss Question
Answer: Option A. -> greater
Answer: (a).greater
Question 62. Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except
  1.    Clostridium
  2.    Rhodospirillum
  3.    Chlorobium
  4.    Escherichia
 Discuss Question
Answer: Option D. -> Escherichia
Answer: (d).Escherichia
Question 63. Which of the following species in water reveal the presence of fecal pollution of human or animal origin?
  1.    E.coli
  2.    Fecal Streptococci
  3.    Clostridium perfringens
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 64. Because it can be used with a variety of media and allow a resuscitation step the __________ technique has become the common and often preferred method of evaluating the microbiological characteristics of water.
  1.    most probable number
  2.    Winogradsky
  3.    MUG
  4.    membrane filtration
 Discuss Question
Answer: Option D. -> membrane filtration
Answer: (d).membrane filtration
Question 65. Trickling filter comes under
  1.    primary treatment
  2.    secondary treatment
  3.    tertiary treatment
  4.    none of these
 Discuss Question
Answer: Option B. -> secondary treatment
Answer: (b).secondary treatment
Question 66. Activated sludge undergoes
  1.    Primary treatment
  2.    Secondary treatment
  3.    Tertiary treatment
  4.    any of these
 Discuss Question
Answer: Option B. -> Secondary treatment
Answer: (b).Secondary treatment
Question 67. The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.
  1.    greater
  2.    lesser
  3.    approximately equal
  4.    half
 Discuss Question
Answer: Option A. -> greater
Answer: (a).greater
Question 68. __________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them.
  1.    low oxygen diffusion environment; soils
  2.    high oxygen diffusion environment; soils
  3.    low oxygen diffusion environment; lakes
  4.    high oxygen diffusion environment; lakes
 Discuss Question
Answer: Option B. -> high oxygen diffusion environment; soils
Answer: (b).high oxygen diffusion environment; soils
Question 69. The degree of salinity in freshwater is nearly zero.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 70. Which of the following compounds are required for growth of saprophytic bacteria and fungi?
  1.    organic compounds
  2.    nitrates
  3.    phosphates
  4.    mercury
 Discuss Question
Answer: Option A. -> organic compounds
Answer: (a).organic compounds

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