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Physical and Chemical Agents

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

pasteurization
disinfection
sterilization
antisepsis

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

high concentration of solutes
low pH
toxic alkaline chemicals
insufficient nutrients

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Physical and Chemical Agents
Which of the following is best to sterilize heat labile solutions?

Pasteurization
Autoclave
Membrane filtration
Dry heat

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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
inspissation
tyndallization
autoclaving

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

Cetylpyridinium chloride
Alcohol
Chlorine
Ethylene oxide

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Physical and Chemical Agents
The organisms retained in the fluids filtered by Seitz filter is

Staphylococcus
Proteus
Clostridium
None of these

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