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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

D value
thermal death point
F value
decimal reduction time

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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

pasteurization
sterilization
antisepsis
disinfection

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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

inspissation
autoclaving
tyndallization
none of these

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

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

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Physical and Chemical Agents
Which disinfectant was the most effective against Salmonella"?

Cetylpyridinium chloride
Phenol
Hexachlorophene
Merthiolate

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

Ethylene oxide
Chlorine
Alcohol
Cetylpyridinium chloride

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