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MCQs

Total Questions : 99 | Page 2 of 10 pages
Question 11. If a canning procedure is not properly followed, which type of microbe is most likely to grow in the canned food?
  1.    Acidophile
  2.    Obligate Anaerobe
  3.    Mesophile
  4.    Obligate Aerobe
 Discuss Question
Answer: Option B. -> Obligate Anaerobe
Question 12. Which disinfectant was the most effective against Salmonella"?
  1.    Merthiolate
  2.    Cetylpyridinium chloride
  3.    Hexachlorophene
  4.    Phenol
 Discuss Question
Answer: Option A. -> Merthiolate
Question 13. Preservation of foods by using salts and sugars works by
  1.    creating a hypertonic environment
  2.    creating a hypotonic environment
  3.    raising pH
  4.    lowering osmotic pressure
 Discuss Question
Answer: Option A. -> creating a hypertonic environment
Question 14. Which of the following does not kill endospores?
  1.    Hot air sterilization
  2.    Incineration
  3.    Autoclave
  4.    Pasteurization
 Discuss Question
Answer: Option D. -> Pasteurization
Question 15. Which of the following items could be sterilized by dry heat sterilization?
  1.    rubber gloves
  2.    Intravenous (IV) solution
  3.    Plastic IV bags
  4.    Glass pipettes
 Discuss Question
Answer: Option D. -> Glass pipettes
Question 16. Which of the following describes the effect of ionizing radiation on microbes?
  1.    Induces electrons and protons to jump out of the molecules of the microbe
  2.    Changes the 3-dimensional structure of proteins to a 2-dimen-sional form
  3.    None of these
  4.    Substantially decreases enzymatic activity, slowing microbial reproduction
 Discuss Question
Answer: Option A. -> Induces electrons and protons to jump out of the molecules of the microbe
Question 17. Bactericidal concentration of phenol is
  1.    0.75%
  2.    0.25%
  3.    1%
  4.    0.5%
 Discuss Question
Answer: Option C. -> 1%
Question 18. Which of the following skin disinfectant(s) is/are most frequently used?
  1.    Isopropyl alcohol
  2.    Both (a) and (b)
  3.    Ethyl alcohol
  4.    none of these
 Discuss Question
Answer: Option B. -> Both (a) and (b)
Question 19. Which of the following is most effective for sterilizing mattresses and plastic petri plates?
  1.    Glutaraldehyde
  2.    Ultraviolet radiation
  3.    Ethylene oxide
  4.    Chlorine
 Discuss Question
Answer: Option C. -> Ethylene oxide
Question 20. All of the following are sporicidal except
  1.    alcohol
  2.    formaldehyde
  3.    ethylene oxide
  4.    glutaraldehyde
 Discuss Question
Answer: Option A. -> alcohol

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