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Physical and Chemical Agents

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

Clostridium
None of these
Proteus
Staphylococcus

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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
Which of the following is/are vapour-phase disinfectant/s?

Formaldehyde
Both (a) and (b)
None of these
Ethylene oxide

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Physical and Chemical Agents
Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have

insufficient nutrients
low pH
toxic alkaline chemicals
high concentration of solutes

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Physical and Chemical Agents
Which of the following is a limitation of the autoclave?

It takes too long to sterilize
It will destroy heat labile materials
It lacks the ability to kill endospores
It lacks the ability to inactivate viruses

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

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

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