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