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Physical and Chemical Agents

Physical and Chemical Agents
Which of the following does not kill endospores?

Incineration
Pasteurization
Autoclave
Hot air sterilization

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

Cationic compounds
Non-ionic compounds
Amphoteric compounds
Anionic compounds

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

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

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Physical and Chemical Agents
Preservation of foods by using salts and sugars works by

lowering osmotic pressure
raising pH
creating a hypertonic environment
creating a hypotonic environment

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

Alcohol
Cetylpyridinium chloride
Ethylene oxide
Chlorine

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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
antisepsis
sterilization
disinfection

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