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Home » Most Probable Number (MPN) Test

Most Probable Number (MPN) Test

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1 Which of the following is a limitation of the MPN test?

  • A) Provides exact bacterial counts
  • B) Time-consuming
  • C) Requires sophisticated equipment
  • D) Cannot be used for large volumes
View Answer & Discuss

2 In the MPN test, what does the term “confirmation test” refer to?

  • A) A second MPN test on the same sample
  • B) A test to confirm the presence of a specific bacterial type
  • C) A test to confirm the sample's volume
  • D) A retest for accuracy in different conditions
View Answer & Discuss

3 In the MPN test, what does the term “most probable number” refer to?

  • A) The highest number of bacteria detected
  • B) The most accurate count of bacteria
  • C) An estimate of bacteria concentration
  • D) The minimum bacteria concentration
View Answer & Discuss

4 How does the MPN test differ from the plate count method?

  • A) MPN provides a direct count, while plate count estimates
  • B) MPN estimates bacterial numbers, while plate count provides direct counts
  • C) MPN uses statistical analysis, while plate count does not
  • D) MPN is faster than plate count method
View Answer & Discuss

5 Which type of sample is commonly used in the MPN test?

  • A) Solid food samples
  • B) Water samples
  • C) Air samples
  • D) Soil samples
View Answer & Discuss

6 What kind of growth pattern is observed in the MPN test tubes?

  • A) Uniform growth across all tubes
  • B) No growth in any tubes
  • C) Variable growth depending on dilution
  • D) Growth only in control tubes
View Answer & Discuss

7 What is the purpose of using different dilution levels in the MPN test?

  • A) To increase the sample size
  • B) To improve the accuracy of results
  • C) To test different types of bacteria
  • D) To estimate bacteria concentration
View Answer & Discuss

8 Which of the following is NOT a common application of the MPN test?

  • A) Water quality testing
  • B) Dairy product safety
  • C) Air quality monitoring
  • D) Food safety testing
View Answer & Discuss

9 What does a positive MPN test result indicate?

  • A) No bacteria present
  • B) Low bacteria concentration
  • C) High bacteria concentration
  • D) Possible bacterial contamination
View Answer & Discuss

10 What is a “positive tube” in the context of the MPN test?

  • A) A tube showing no bacterial growth
  • B) A tube where bacteria are present
  • C) A tube with contaminated sample
  • D) A tube with no results
View Answer & Discuss
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