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Physical and Chemical Agents

Physical and Chemical Agents
Steam exposure of a material at 100°C for 20 minutes for three consecutive days is known as

inspissation
none of these
autoclaving
tyndallization

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Physical and Chemical Agents
Which of the following skin disinfectant(s) is/are most frequently used?

none of these
Isopropyl alcohol
Both (a) and (b)
Ethyl alcohol

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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
toxic alkaline chemicals
low pH
high concentration of solutes

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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 Anaerobe
Mesophile
Obligate Aerobe
Acidophile

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

Cationic compounds
Amphoteric compounds
Non-ionic compounds
Anionic compounds

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

Pasteurization
Autoclave
Hot air sterilization
Incineration

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