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Physical and Chemical Agents

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

insufficient nutrients
toxic alkaline chemicals
high concentration of solutes
low pH

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Physical and Chemical Agents
Which of the following is most effective for sterilizing mattresses and plastic petri plates?

Ethylene oxide
Glutaraldehyde
Chlorine
Ultraviolet radiation

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

none of these
autoclaving
inspissation
tyndallization

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Physical and Chemical Agents
Which of the following is sterilized with the help of glutaraldehyde?

Cystoscopes
All of these
Bronchoscopes
Thermometers

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

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

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