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Physical and Chemical Agents

Physical and Chemical Agents
Which of the following is best to sterilize heat labile solutions?

Pasteurization
Dry heat
Membrane filtration
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?

10
5
50
1

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Physical and Chemical Agents
The organisms retained in the fluids filtered by Seitz filter is

Clostridium
None of these
Staphylococcus
Proteus

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Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

lowering osmotic pressure
creating a hypotonic environment
creating a hypertonic environment
raising pH

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Physical and Chemical Agents
Iodophores are mixture of

iodine and phenols
iodine and aldehydes
iodine and alcohols
iodine and surface active agents

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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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