Physical and Chemical Agents problems
- 1. Which of the following process can be efficiently carried out by incineration?
Options- A. Sterilization of scalpel blades and needles
- B. Sterilization of all glass syringes
- C. Sterilization of points of forceps
- D. Destruction of contaminated materials Discuss
Correct Answer: Destruction of contaminated materials
- 2. Which of the following substances can sterilize?
Options- A. Alcohol
- B. Cetylpyridinium chloride
- C. Ethylene oxide
- D. Chlorine Discuss
Correct Answer: Ethylene oxide
- 3. Preservation of foods by using salts and sugars works by
Options- A. raising pH
- B. lowering osmotic pressure
- C. creating a hypertonic environment
- D. creating a hypotonic environment Discuss
Correct Answer: creating a hypertonic environment
- 4. Which of the following has most heat resistant spores?
Options- A. Clostridium histolyticum
- B. Clostridium perfringens
- C. Bacillus stearothermophilus
- D. Bacillus cereus Discuss
Correct Answer: Bacillus stearothermophilus
- 5. The time required to kill 90% of the microorganisms in a sample at a specific temperature is the
Options- A. decimal reduction time
- B. thermal death point
- C. F value
- D. D value Discuss
Correct Answer: D value
- 6. Which of the following items could be sterilized by dry heat sterilization?
Options- A. Intravenous (IV) solution
- B. Plastic IV bags
- C. Glass pipettes
- D. rubber gloves Discuss
Correct Answer: Glass pipettes
- 7. Microbes can be removed from a liquid solution by the process of
Options- A. filtration
- B. freeze-drying
- C. osmosis
- D. desiccation Discuss
Correct Answer: filtration
- 8. The time in minutes at a specific temperature needed to kill a population of cells is the
Options- A. decimal reduction time
- B. thermal death point
- C. thermal death temperature
- D. F value Discuss
Correct Answer: F value
- 9. Milk is pasteurized in batch method by keeping it at
Options- A. 63°C for 30 minutes
- B. 72°C for 60 seconds
- C. 73°C for 30 minutes
- D. 72°C for 6 minutes Discuss
Correct Answer: 63°C for 30 minutes
- 10. Which of the following does not kill endospores?
Options- A. Autoclave
- B. Incineration
- C. Hot air sterilization
- D. Pasteurization Discuss
Correct Answer: Pasteurization
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