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MCQs

Total Questions : 137 | Page 4 of 14 pages
Question 31. Which of the following method is used for viable count of a culture?
  1.    Direct microscopic count
  2.    Plate-count method
  3.    Membrane-filter count
  4.    Plate-count method and membrane-filter count
 Discuss Question
Answer: Option D. -> Plate-count method and membrane-filter count
Answer: (d).Plate-count method and membrane-filter count
Question 32. Which of the following is the relationship between optical density and cell mass?
  1.    exponentially proportional
  2.    linearly proportional
  3.    inversely proportional
  4.    not related
 Discuss Question
Answer: Option B. -> linearly proportional
Answer: (b).linearly proportional
Question 33. Mac-Conkey medium is an example of
  1.    transport medium
  2.    enrichment medium
  3.    differential medium
  4.    all of these
 Discuss Question
Answer: Option C. -> differential medium
Answer: (c).differential medium
Question 34. A disease producing species occurring in a mixed culture can often be selected on the basis of its
  1.    pathogenic properties
  2.    special carbon source
  3.    special nitrogen source
  4.    none of these
 Discuss Question
Answer: Option A. -> pathogenic properties
Answer: (a).pathogenic properties
Question 35. For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at
  1.    6.35
  2.    5.35
  3.    4.35
  4.    5.75
 Discuss Question
Answer: Option B. -> 5.35
Answer: (b).5.35
Question 36. Pseudomonas aeruginosa forms a blue water soluble pigment called
  1.    pyocyanin
  2.    chlororaphin
  3.    pyoverdin
  4.    β-carotene
 Discuss Question
Answer: Option A. -> pyocyanin
Answer: (a).pyocyanin
Question 37. Agar is used for solidifying culture media because
  1.    it does not affect by the growth of bacteria
  2.    it does not add to the nutritive properties of the medium
  3.    the melting and solidifying points of agar solution are not the same
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 38. Important example(s) of enriched medium/media is/ are
  1.    Loeffler's serum slope
  2.    Bordet-gengou medium
  3.    Blood agar
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 39. Cell counting can be carried out by
  1.    direct microscopic count using petroffhansser counting chamber
  2.    plate counting
  3.    membrane filter count
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 40. Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type?
  1.    Pour plate
  2.    Spread plate
  3.    Both (a) and (b)
  4.    Streak plate technique
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)

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