- 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
Most Probable Number (MPN) Test
Total MCQ: 23
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12 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
13 Which type of sample is commonly used in the MPN test?
- A) Solid food samples
- B) Water samples
- C) Air samples
- D) Soil samples
14 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
15 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
16 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
17 What does a positive MPN test result indicate?
- A) No bacteria present
- B) Low bacteria concentration
- C) High bacteria concentration
- D) Possible bacterial contamination
18 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
19 Which medium is commonly used in the MPN test?
- A) Nutrient agar
- B) EMB agar
- C) Lauryl tryptose broth
- D) MacConkey agar
20 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