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Physical and Chemical Agents

Physical and Chemical Agents
The time required to kill 90% of the microorganisms in a sample at a specific temperature is the

F value
D value
thermal death point
decimal reduction time

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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
Acidophile
Obligate Aerobe

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Physical and Chemical Agents
The process of making an object free from living organisms including bacterial and fungal spores and viruses is known as

disinfection
antisepsis
sterilization
pasteurization

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

toxic alkaline chemicals
high concentration of solutes
insufficient nutrients
low pH

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

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

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

tyndalization
pasteurization
dry heat
UV radiation

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