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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
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 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
A(n)____is used to prevent infection by killing or inhibiting pathogen growth on animal tissues.

antiseptic
sanitizer
bacteriostatic agent
disinfectant

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

disinfection
antisepsis
none of these
sterilization

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

Anionic compounds
Non-ionic compounds
Cationic compounds
Amphoteric compounds

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