- A) No bacteria present
- B) Low bacteria concentration
- C) High bacteria concentration
- D) Possible bacterial contamination
Microbiology MCQ
Total MCQ:
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MCQ Quiz on Microbiology
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
3 Which medium is commonly used in the MPN test?
- A) Nutrient agar
- B) EMB agar
- C) Lauryl tryptose broth
- D) MacConkey agar
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
5 What does the MPN table help determine?
- A) Type of bacteria present
- B) Bacteria count estimate
- C) Antibiotic resistance
- D) Bacterial growth rate
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
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
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
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
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