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MCQs

Total Questions : 49 | Page 1 of 5 pages
Question 1. The gram-negative organisms is
  1.    Clostridium
  2.    Bacillus
  3.    Actinomyces
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 2. Which of the following is a substitute for crystal violet used in gram-staining procedure?
  1.    Phenolpthalene
  2.    Methylene blue
  3.    Safranin
  4.    Bromocresol green
 Discuss Question
Answer: Option B. -> Methylene blue
Question 3. Catalase production is negative in which of the following?
  1.    Staphylococcus
  2.    Streptococcus
  3.    Salmonella
  4.    Proteus
 Discuss Question
Answer: Option B. -> Streptococcus
Question 4. Which of the following inference(s) indicate(s) the ability of an organism to utilize citrate as a sole source of carbon in Simmon's citrate medium?
  1.    Appearance of growth
  2.    Blue colour
  3.    None of these
  4.    Both (a) and (b)
 Discuss Question
Answer: Option D. -> Both (a) and (b)
Question 5. The organisms that can be acid-fast stained is
  1.    all of these
  2.    Nocardia
  3.    Lepra bacilli
  4.    Tubercle bacilli
 Discuss Question
Answer: Option A. -> all of these
Question 6. The production of sufficient acid by fermentation of glucose leads to decrease in pH such that pH of the medium falls below 4.5. Which of the following test can detect it?
  1.    Methyl red test
  2.    Indole test
  3.    Citrate utilization test
  4.    Voges-Proskauer test
 Discuss Question
Answer: Option A. -> Methyl red test
Question 7. At what concentration of sulphuric acid, Nocardia resists decolourization?
  1.    5% sulphuric acid
  2.    8% sulphuric acid
  3.    10% sulphuric acid
  4.    0.5% sulphuric acid
 Discuss Question
Answer: Option D. -> 0.5% sulphuric acid
Question 8. Production of acetoin can be detected by which of the following tests?
  1.    Indole test
  2.    Methyl red test
  3.    Citrate test
  4.    Voges-Proskauer test
 Discuss Question
Answer: Option D. -> Voges-Proskauer test
Question 9. The primary stain of Gram's method is
  1.    safranin
  2.    phenolpthalene
  3.    crystal violet
  4.    methyl red
 Discuss Question
Answer: Option C. -> crystal violet
Question 10. Which of the following is commonly used as Gram's decolouriser?
  1.    A mixture of ethyl alcohol and acetone
  2.    Methyl alcohol
  3.    Ethyl alcohol
  4.    Acetone
 Discuss Question
Answer: Option A. -> A mixture of ethyl alcohol and acetone

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