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Physical and Chemical Agents

Physical and Chemical Agents
Microbes can be removed from a liquid solution by the process of

freeze-drying
desiccation
osmosis
filtration

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Physical and Chemical Agents
Which of the following has most heat resistant spores?

Bacillus cereus
Bacillus stearothermophilus
Clostridium perfringens
Clostridium histolyticum

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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?

1
5
10
50

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Physical and Chemical Agents
Media containing spores and thermolabile constituents are sterilized by

tyndalization
dry heat
UV radiation
pasteurization

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Physical and Chemical Agents
Complete destruction of the microorganisms is commonly known as

none of these
antisepsis
disinfection
sterilization

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Physical and Chemical Agents
The time required to kill 90% of the microorganisms in a sample at a specific temperature is the

thermal death point
decimal reduction time
F value
D value

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