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Physical and Chemical Agents

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

Anionic compounds
Amphoteric compounds
Non-ionic compounds
Cationic compounds

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

Autoclave
Hot air sterilization
Pasteurization
Incineration

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

insufficient nutrients
high concentration of solutes
toxic alkaline chemicals
low pH

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

tyndalization
dry heat
pasteurization
UV radiation

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

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

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