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Microbiology
Microbiology Basic
Quiz 1
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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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