- A) Nutrient agar
- B) EMB agar
- C) Lauryl tryptose broth
- D) MacConkey agar
Most Probable Number (MPN) Test
Total MCQ: 23
12 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
13 What does the MPN table help determine?
- A) Type of bacteria present
- B) Bacteria count estimate
- C) Antibiotic resistance
- D) Bacterial growth rate
14 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
15 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
16 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
17 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
18 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
19 What is the role of selective media in the MPN test?
- A) To inhibit the growth of unwanted bacteria
- B) To enhance bacterial growth
- C) To test for antibiotic resistance
- D) To measure bacterial size
20 Why are multiple tubes used in the MPN test?
- A) To increase sample size
- B) To ensure accurate results
- C) To account for variability and improve accuracy
- D) To decrease analysis time