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MCQs

Total Questions : 137 | Page 3 of 14 pages
Question 21. In physical method of selection, endospore-forming bacteria can be obtained by heating the mixed culture to _____________
  1.    70 degree C for 10 minutes
  2.    80 degree C for 10 minutes
  3.    60 degree C for 10 minutes
  4.    90 degree C for 10 minutes
 Discuss Question
Answer: Option B. -> 80 degree C for 10 minutes
Answer: (b).80 degree C for 10 minutes
Question 22. Which of the following is not a physical method for selection of pure culture?
  1.    Heat treatment
  2.    pH of the media
  3.    Cell size and motility
  4.    Use of dilute media
 Discuss Question
Answer: Option D. -> Use of dilute media
Answer: (d).Use of dilute media
Question 23. Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni?
  1.    Vacomycin
  2.    Polymyxin
  3.    Trimethoprim
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Answer: (d).None of these
Question 24. To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of
  1.    8.5
  2.    8.90
  3.    6.79
  4.    3.5
 Discuss Question
Answer: Option A. -> 8.5
Answer: (a).8.5
Question 25. For the selection of endospore-forming bacteria, a mixed culture can be heated at
  1.    80°C for 10 minutes
  2.    70°C for 10 minutes
  3.    60°C for 10 minutes
  4.    90°C for 10 minutes
 Discuss Question
Answer: Option A. -> 80°C for 10 minutes
Answer: (a).80°C for 10 minutes
Question 26. The concentration of agar to obtain semi solid media is
  1.    1.5-20%
  2.    0.5% or less
  3.    >10%
  4.    >10%but<20%
 Discuss Question
Answer: Option B. -> 0.5% or less
Answer: (b).0.5% or less
Question 27. Which of the following bacteria dies quickly after drying?
  1.    Treponema pallidium
  2.    Mycobacterium tuberculosis
  3.    Staphylococcus aureus
  4.    Pseudomonas aeruginosa
 Discuss Question
Answer: Option A. -> Treponema pallidium
Answer: (a).Treponema pallidium
Question 28. Which of the following is an indirect method for measuring bacterial growth?
  1.    Cell count
  2.    Cell mass
  3.    Cell activity
  4.    Both Cell mass and Cell activity
 Discuss Question
Answer: Option C. -> Cell activity
Answer: (c).Cell activity
Question 29. The number of bacteria per ml depends on the dilution of the sample.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 30. Which of the following instrument is used for bacterial count?
  1.    Petroff-Hausser counting chamber
  2.    Microscope
  3.    Chemostat
  4.    Turbidostat
 Discuss Question
Answer: Option A. -> Petroff-Hausser counting chamber
Answer: (a).Petroff-Hausser counting chamber

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