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MCQs

Total Questions : 43 | Page 2 of 5 pages
Question 11. Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except
  1.    Clostridium
  2.    Rhodospirillum
  3.    Escherichia
  4.    Chlorobium
 Discuss Question
Answer: Option C. -> Escherichia
Question 12. Activated sludge undergoes
  1.    any of these
  2.    Primary treatment
  3.    Secondary treatment
  4.    Tertiary treatment
 Discuss Question
Answer: Option C. -> Secondary treatment
Question 13. Trickling filter comes under
  1.    tertiary treatment
  2.    primary treatment
  3.    secondary treatment
  4.    none of these
 Discuss Question
Answer: Option C. -> secondary treatment
Question 14. Which of the following species in water reveal the presence of fecal pollution of human or animal origin?
  1.    Clostridium perfringens
  2.    E.coli
  3.    All of these
  4.    Fecal Streptococci
 Discuss Question
Answer: Option C. -> All of these
Question 15. 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.    membrane filtration
  2.    MUG
  3.    Winogradsky
  4.    most probable number
 Discuss Question
Answer: Option A. -> membrane filtration
Question 16. The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.
  1.    half
  2.    approximately equal
  3.    lesser
  4.    greater
 Discuss Question
Answer: Option D. -> greater
Question 17. __________ 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; lakes
  3.    low oxygen diffusion environment; lakes
  4.    high oxygen diffusion environment; soils
 Discuss Question
Answer: Option D. -> high oxygen diffusion environment; soils
Question 18.  The Redfield ratio is an index of concentration of
  1.    carbon, hydrogen and oxygen
  2.    nitrogen, potassium and iron
  3.    carbon, nitrogen and phosphorous
  4.    carbon, phosphorous and sulfur
 Discuss Question
Answer: Option C. -> carbon, nitrogen and phosphorous
Question 19.  Removal of solids is generally considered as a
  1.    Primary treatment
  2.    Secondary treatment
  3.    Tertiary treatment
  4.    None of these
 Discuss Question
Answer: Option A. -> Primary treatment
Question 20.  Chemical precipitation of phosphorus is
  1.    primary treatment
  2.    secondary treatment
  3.    tertiary treatment
  4.    both (a) and (b)
 Discuss Question
Answer: Option C. -> tertiary treatment

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