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Physical and Chemical Agents

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
Obligate Aerobe
Mesophile
Acidophile

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Physical and Chemical Agents
Which of the following is a limitation of the autoclave?

It lacks the ability to kill endospores
It will destroy heat labile materials
It takes too long to sterilize
It lacks the ability to inactivate viruses

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

Alcohol
Ethylene oxide
Chlorine
Cetylpyridinium chloride

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Physical and Chemical Agents
Bactericidal concentration of phenol is

0.5%
1%
0.25%
0.75%

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Physical and Chemical Agents
Which of the following is/are vapour-phase disinfectant/s?

Ethylene oxide
None of these
Formaldehyde
Both (a) and (b)

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

low pH
insufficient nutrients
toxic alkaline chemicals
high concentration of solutes

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