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Physical and Chemical Agents

Physical and Chemical Agents
Which is the most important surface active disinfectants?

Anionic compounds
Cationic compounds
Non-ionic compounds
Amphoteric compounds

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Physical and Chemical Agents
Steam exposure of a material at 100°C for 20 minutes for three consecutive days is known as

autoclaving
tyndallization
none of these
inspissation

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Physical and Chemical Agents
Which of the following does not kill endospores?

Pasteurization
Incineration
Hot air sterilization
Autoclave

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Physical and Chemical Agents
If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

5
50
10
1

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Physical and Chemical Agents
One drawback to the use of ultraviolet light as a sterilizing agent is its

failure to bacterial spores
failure to kill microbes in a closed environment
failure to kill microbes located in the center of an object
failure to kill bacteria

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Physical and Chemical Agents
A(n)____is used to prevent infection by killing or inhibiting pathogen growth on animal tissues.

antiseptic
disinfectant
sanitizer
bacteriostatic agent

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