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Home » Most Probable Number (MPN) Test

Microbiology MCQ

Total MCQ:
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MCQ Quiz on Microbiology

1 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

2 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

3 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

4 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

5 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

6 What is a key advantage of the MPN test over other microbiological methods?

  • A) Provides results more quickly
  • B) Less expensive
  • C) Requires fewer technical skills
  • D) Estimates bacteria without direct counting
View Answer & Discuss

7 How is the MPN number usually expressed?

  • A) In colony-forming units per milliliter
  • B) As a percentage
  • C) As a ratio
  • D) In most probable number per 100 mL
View Answer & Discuss

8 What type of statistical analysis is used to interpret MPN test results?

  • A) Descriptive statistics
  • B) Inferential statistics
  • C) Poisson distribution
  • D) Chi-square test
View Answer & Discuss

9 What is the significance of a “negative” result in an MPN test?

  • A) No bacteria detected
  • B) Bacteria are present in high numbers
  • C) The sample is contaminated
  • D) Results are inconclusive
View Answer & Discuss

10 How are the results of the MPN test typically reported?

  • A) As a binary positive/negative result
  • B) As a specific bacterial species count
  • C) As a most probable number of bacteria
  • D) As a range of bacterial types
View Answer & Discuss
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