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MCQs

Total Questions : 99 | Page 6 of 10 pages
Question 51.  The time required to kill 90% of the microorganisms in a sample at a specific temperature is the
  1.    decimal reduction time
  2.    thermal death point
  3.    F value
  4.    D value
 Discuss Question
Answer: Option D. -> D value
Question 52.  Which of the following is not a disinfectant containing a heavy metal?
  1.    Silver nitrate
  2.    Mercurochrome
  3.    Copper sulfate
  4.    Chlorine
 Discuss Question
Answer: Option D. -> Chlorine
Question 53.  Which of the following is best to sterilize heat labile solutions?
  1.    Dry heat
  2.    Autoclave
  3.    Membrane filtration
  4.    Pasteurization
 Discuss Question
Answer: Option C. -> Membrane filtration
Question 54.  Which is the most important surface active disinfectants?
  1.    Amphoteric compounds
  2.    Cationic compounds
  3.    Non-ionic compounds
  4.    Anionic compounds
 Discuss Question
Answer: Option B. -> Cationic compounds
Question 55.  Which disinfectant would be most effective against Staphylococcus found in a blood spill?
  1.    Phenol
  2.    Cetylpyridinium chloride
  3.    Hexachlorophene
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 56.  Which of the following substances can sterilize?
  1.    Alcohol
  2.    Cetylpyridinium chloride
  3.    Ethylene oxide
  4.    Chlorine
 Discuss Question
Answer: Option C. -> Ethylene oxide
Question 57. . Milk is pasteurized in batch method by keeping it at
  1.    63°C for 30 minutes
  2.    72°C for 60 seconds
  3.    73°C for 30 minutes
  4.    72°C for 6 minutes
 Discuss Question
Answer: Option A. -> 63°C for 30 minutes
Question 58. . Which of the following does not kill endospores?
  1.    Autoclave
  2.    Incineration
  3.    Hot air sterilization
  4.    Pasteurization
 Discuss Question
Answer: Option D. -> Pasteurization
Question 59. . Which of the following items could be sterilized by dry heat sterilization?
  1.    Intravenous (IV) solution
  2.    Plastic IV bags
  3.    Glass pipettes
  4.    rubber gloves
 Discuss Question
Answer: Option C. -> Glass pipettes
Question 60. . Preservation of foods by using salts and sugars works by
  1.    raising pH
  2.    lowering osmotic pressure
  3.    creating a hypertonic environment
  4.    creating a hypotonic environment
 Discuss Question
Answer: Option C. -> creating a hypertonic environment

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