Milk is pasteurized in batch method by keeping it at 63�C for 30 minutes 72�C fo

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Question
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

Correct Answer

63�C for 30 minutes

Physical and Chemical Agents problems

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1. 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

2. 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

3. 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

4. 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

5. 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

6. Which of the following does not kill endospores?
Options
A. Autoclave
B. Incineration
C. Hot air sterilization
D. Pasteurization

Discuss

Correct Answer: Pasteurization

7. Iodophores are mixture of
Options
A. iodine and aldehydes
B. iodine and surface active agents
C. iodine and alcohols
D. iodine and phenols

Discuss

Correct Answer: iodine and surface active agents

8. All of the following are sporicidal except
Options
A. glutaraldehyde
B. ethylene oxide
C. formaldehyde
D. alcohol

Discuss

Correct Answer: alcohol

9. Complete destruction of the microorganisms is commonly known as
Options
A. disinfection
B. sterilization
C. antisepsis
D. none of these

Discuss

Correct Answer: antisepsis

10. Which of the following is best used for long term storage of microbial samples when carried out properly?
Options
A. Storage in a freezer at -10�C
B. Storage in a freezer at ultra low temperatures (-70�C)
C. Storage in a refrigerator on an agar slant
D. Storage on a petri plate at room temperature

Discuss

Correct Answer: Storage in a freezer at ultra low temperatures (-70�C)

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Physical and Chemical Agents problems

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