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Microbiology

PHYSICAL AND CHEMICAL AGENTS MCQs

Total Questions : 47

Page 1 of 5 pages
Question 1. Which of the following is best to sterilize heat labile solutions?
  1.    Autoclave
  2.    Pasteurization
  3.    Membrane filtration
  4.    Dry heat
 Discuss Question
Answer is Option C. -> Membrane filtration
Question 2. Which of the following disinfectants act by disrupting microbial membranes?
  1.    Aldehydes
  2.    Heavy metals
  3.    Halogens
  4.    Cationic detergents
 Discuss Question
Answer is Option D. -> Cationic detergents
Question 3. Which of the following articles can be sterilized in an autoclave?
  1.    Dressing material
  2.    All of these
  3.    Gloves
  4.    Culture media
 Discuss Question
Answer is Option B. -> All of these
Question 4. The time required to kill 90% of the microorganisms in a sample at a specific temperature is the
  1.    F value
  2.    decimal reduction time
  3.    D value
  4.    thermal death point
 Discuss Question
Answer is Option C. -> D value
Question 5. Which of the following is best used for long term storage of microbial samples when carried out properly?
  1.    Storage in a freezer at ultra low temperatures (-70°C)
  2.    Storage on a petri plate at room temperature
  3.    Storage in a freezer at -10°C
  4.    Storage in a refrigerator on an agar slant
 Discuss Question
Answer is Option A. -> Storage in a freezer at ultra low temperatures (-70°C)
Question 6. Which is the most important surface active disinfectants?
  1.    Cationic compounds
  2.    Anionic compounds
  3.    Amphoteric compounds
  4.    Non-ionic compounds
 Discuss Question
Answer is Option A. -> Cationic compounds
Question 7. Which disinfectant would be most effective against Staphylococcus found in a blood spill?
  1.    Cetylpyridinium chloride
  2.    Hexachlorophene
  3.    None of these
  4.    Phenol
 Discuss Question
Answer is Option C. -> None of these
Question 8. Which of the following substances can sterilize?
  1.    Chlorine
  2.    Cetylpyridinium chloride
  3.    Alcohol
  4.    Ethylene oxide
 Discuss Question
Answer is Option D. -> Ethylene oxide
Question 9. Which of the following is not a disinfectant containing a heavy metal?
  1.    Silver nitrate
  2.    Mercurochrome
  3.    Chlorine
  4.    Copper sulfate
 Discuss Question
Answer is Option C. -> Chlorine
Question 10. Milk is pasteurized in batch method by keeping it at
  1.    63°C for 30 minutes
  2.    73°C for 30 minutes
  3.    72°C for 6 minutes
  4.    72°C for 60 seconds
 Discuss Question
Answer is Option A. -> 63°C for 30 minutes
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Sub Topics

  • Actinomycetes And Non Sporing Anaerobes
  • Algae And Protozoa
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