Q.1
Which of the following methods is used for determining the decrease in the amount of growth?
  • a) test done on agar medium plate
  • b) test done into an agar medium or broth
  • c) test done by transfering water-soluble substances to sterile media
  • d) by phenol-coefficient method
Q.2
Liquid water-soluble substances appropriately diluted are dispensed into sterile test tubes, to which are added a measured amount of the test organism and then this is transferred into tubes of sterile media.This method helps in determining _____________________
  • a) whether the inhibitory action is bactericidal
  • b) whether the inhibitory action is bacteristatic
  • c) decrease in the amount of growth
  • d) complete absence of growth
Q.3
We observe increased growth in nutrient agar plates as concentration of chemical agent is decreased.
  • a) True
  • b) False
Q.4
Which of the following acts as a test organism in the procedure of phenol-coefficient method?
  • a) Escherichia coli
  • b) Streptococcus faecalis
  • c) Staphylococcus aureus
  • d) Lactobacillus
Q.5
Which of the following chemical agents lack penetrating power?
  • a) Phenol
  • b) Iodine
  • c) Ethylene oxide
  • d) Beta-propiolactone
Q.6
Which of the following agent is used to disinfect skin?
  • a) Chlorine
  • b) Formaldehyde
  • c) Quaternaries
  • d) Ethylene oxide
Q.7
Iodine kills the microorganisms by causing the denaturation of proteins.
  • a) True
  • b) False
Q.8
Which of the following is the mode of action of formaldehyde?
  • a) interference with glycolysis
  • b) shows oxidizing property
  • c) combines with vital nitrogen compounds
  • d) changes the permeability of cytoplasmic membrane
Q.9
For sterilization of plastic syringes in hospitals which of the following agents are used?
  • a) ethylene oxide
  • b) dyes
  • c) radiations
  • d) heavy metals
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