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Physical and Chemical Agents

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

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

F value
decimal reduction time
thermal death temperature
thermal death point

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Physical and Chemical Agents
Which of the following disinfectants act by disrupting microbial membranes?

Halogens
Heavy metals
Aldehydes
Cationic detergents

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

desiccation
osmosis
filtration
freeze-drying

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Physical and Chemical Agents
Which of the following has most heat resistant spores?

Clostridium histolyticum
Clostridium perfringens
Bacillus stearothermophilus
Bacillus cereus

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Physical and Chemical Agents
Ethylene oxide is used to destroy or kill which of the following microbes?

Bacteria
Fungi
Spores
All of these

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