physical-and-chemical-agents microbiology question and answers -Page 4

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Physical and Chemical Agents problems

1. The process of making an object free from living organisms including bacterial and fungal spores and viruses is known as
Options
A. pasteurization
B. antisepsis
C. disinfection
D. sterilization

Discuss

Correct Answer: sterilization

2. The organisms retained in the fluids filtered by Seitz filter is
Options
A. Proteus
B. Staphylococcus
C. Clostridium
D. None of these

Discuss

Correct Answer: None of these

3. Which of the following is a limitation of the autoclave?
Options
A. It takes too long to sterilize
B. It lacks the ability to inactivate viruses
C. It lacks the ability to kill endospores
D. It will destroy heat labile materials

Discuss

Correct Answer: It will destroy heat labile materials

4. One drawback to the use of ultraviolet light as a sterilizing agent is its
Options
A. failure to kill bacteria
B. failure to bacterial spores
C. failure to kill microbes in a closed environment
D. failure to kill microbes located in the center of an object

Discuss

Correct Answer: failure to kill microbes located in the center of an object

5. For sterilization of which material gamma rays can be used?
Options
A. Catheters
B. Plastic syringes
C. Canulas
D. None of these

Discuss

Correct Answer: None of these

6. Ethylene oxide is used to destroy or kill which of the following microbes?
Options
A. Bacteria
B. Spores
C. Fungi
D. All of these

Discuss

Correct Answer: All of these

7. Which of the following is sterilized with the help of glutaraldehyde?
Options
A. Thermometers
B. Bronchoscopes
C. Cystoscopes
D. All of these

Discuss

Correct Answer: All of these

8. Which disinfectant was the most effective against Salmonella"?
Options
A. Phenol
B. Cetylpyridinium chloride
C. Hexachlorophene
D. Merthiolate

Discuss

Correct Answer: Merthiolate

9. Which of the following is bactericidal?
Options
A. Membrane filtration
B. Ionizing radiation
C. Freeze-drying
D. Deep freezing

Discuss

Correct Answer: Ionizing radiation

10. Which of the following is most effective for sterilizing mattresses and plastic petri plates?
Options
A. Chlorine
B. Ethylene oxide
C. Glutaraldehyde
D. Ultraviolet radiation

Discuss

Correct Answer: Ethylene oxide

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