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Physical and Chemical Agents

Physical and Chemical Agents
Bactericidal concentration of phenol is

0.75%
1%
0.25%
0.5%

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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

F value
decimal reduction time
thermal death temperature
thermal death point

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

Non-ionic compounds
Anionic compounds
Cationic compounds
Amphoteric compounds

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Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

raising pH
lowering osmotic pressure
creating a hypertonic environment
creating a hypotonic environment

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

sterilization
antisepsis
disinfection
none of these

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Physical and Chemical Agents
All of the following are sporicidal except

alcohol
glutaraldehyde
ethylene oxide
formaldehyde

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