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PHYSICAL AND CHEMICAL AGENTS

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

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

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

Clostridium histolyticum
Bacillus cereus
Bacillus stearothermophilus
Clostridium perfringens

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Physical and Chemical Agents
The lowest temperature that kills all microorganisms in a liquid suspension in 10 minutes is known as the

thermal death temperature
thermal death time
decimal reduction time
thermal death point

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Physical and Chemical Agents
Which of the following tests is designed to simulate the natural conditions under which the disinfectants are used in hospitals?

Minimum inhibitory concentration test
Phenol coefficient test
None of these
Capacity test

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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

tyndallization
autoclaving
inspissation
none of these

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