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Physical and Chemical Agents

Physical and Chemical Agents
Which of the following is not a disinfectant containing a heavy metal?

Chlorine
Copper sulfate
Mercurochrome
Silver nitrate

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Physical and Chemical Agents
Which of the following substances can sterilize?

Alcohol
Cetylpyridinium chloride
Chlorine
Ethylene oxide

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Physical and Chemical Agents
Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have

high concentration of solutes
insufficient nutrients
toxic alkaline chemicals
low pH

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

none of these
disinfection
sterilization
antisepsis

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Physical and Chemical Agents
Which of the following disinfectants act by disrupting microbial membranes?

Cationic detergents
Halogens
Heavy metals
Aldehydes

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Physical and Chemical Agents
The time in minutes at a specific temperature needed to kill a population of cells is the

thermal death point
F value
thermal death temperature
decimal reduction time

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