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Physical and Chemical Agents

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

antisepsis
disinfection
none of these
sterilization

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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

thermal death temperature
thermal death point
decimal reduction time
F value

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Physical and Chemical Agents
Milk is pasteurized in batch method by keeping it at

72°C for 6 minutes
72°C for 60 seconds
63°C for 30 minutes
73°C for 30 minutes

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

Clostridium
Proteus
Staphylococcus
None of these

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Physical and Chemical Agents
Which of the following methods will not sterilize?

100°C boiling water for 30 minutes
121°C at 15 lb/in pressure for 15 to 20 minutes
Dry heat at 171°C for 1 to 2 hours
Aqueous glutaraldehyde for 10 hours

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Physical and Chemical Agents
Microbes can be removed from a liquid solution by the process of

filtration
freeze-drying
desiccation
osmosis

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