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Physical and Chemical Agents

Physical and Chemical Agents
Which disinfectant was the most effective against Salmonella"?

Hexachlorophene
Cetylpyridinium chloride
Merthiolate
Phenol

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Physical and Chemical Agents
For sterilization of which material gamma rays can be used?

None of these
Plastic syringes
Catheters
Canulas

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Physical and Chemical Agents
If a canning procedure is not properly followed, which type of microbe is most likely to grow in the canned food?

Obligate Aerobe
Obligate Anaerobe
Acidophile
Mesophile

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Physical and Chemical Agents
Which of the following methods will not sterilize?

100°C boiling water for 30 minutes
Aqueous glutaraldehyde for 10 hours
Dry heat at 171°C for 1 to 2 hours
121°C at 15 lb/in pressure for 15 to 20 minutes

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

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

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

dry heat
pasteurization
UV radiation
tyndalization

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