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Home » Most Probable Number (MPN) Test

Microbiology MCQ

Total MCQ: 174

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MCQ Quiz on Microbiology

11 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

12 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

13 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

14 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

15 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

16 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

17 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

18 Which medium is commonly used in the MPN test?

  • A) Nutrient agar
  • B) EMB agar
  • C) Lauryl tryptose broth
  • D) MacConkey agar
View Answer & Discuss

19 How is the MPN result used in regulatory standards?

  • A) To confirm the exact bacterial species
  • B) To estimate bacterial concentrations for compliance
  • C) To determine the bacterial strain
  • D) To identify specific contamination sources
View Answer & Discuss

20 What does the MPN table help determine?

  • A) Type of bacteria present
  • B) Bacteria count estimate
  • C) Antibiotic resistance
  • D) Bacterial growth rate
View Answer & Discuss
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