Question 1

Which of the following is the most appropriate action if you accidentally spill a biological culture on your workbench in a microbiology laboratory?

Accepted Answer

Notify your instructor, disinfect the area, and dispose of contaminated materials in the designated biohazard container.

Question 2

A student is seen eating a snack while working with bacterial cultures. Which laboratory safety rule is being violated?

Accepted Answer

The rule against eating, drinking, or applying cosmetics in the laboratory.

Question 3

Which of the following best describes the correct disposal method for broken glassware contaminated with biological material?

Accepted Answer

Dispose of it in a designated sharps container labeled for biohazardous waste.

Question 4

Which biosafety level (BSL) laboratory requires the use of a Class III biological safety cabinet, positive pressure suits, and airlock entry?

Accepted Answer

BSL 4

Question 5

A student is wearing shorts, sandals, and a sleeveless shirt in the laboratory. Which safety principle is being violated?

Accepted Answer

Proper personal protective equipment (PPE) use.

Question 6

Which of the following is NOT a recommended practice when working with a Bunsen burner in the microbiology lab?

Accepted Answer

Leaving the burner unattended while lit.

Question 7

Which equation best represents the calculation for the concentration $$C of a $$solution if $$n$$ moles of solute are dissolved in $$V$$ liters of solvent?

Accepted Answer

$$C = \frac{n}{V}$$

Question 8

Which of the following is the correct order of steps to take if you are exposed to a chemical splash in your eyes?

Accepted Answer

Notify your instructor, rinse your eyes at the eyewash station for at least 15 minutes, and seek medical attention.

Question 9

Which of the following is a key reason for not wearing contact lenses in the microbiology laboratory?

Accepted Answer

Contact lenses can absorb and retain chemicals, increasing the risk of eye injury.

Question 10

A student decides to perform an experiment found online without consulting the instructor. Which safety principle is being violated?

Accepted Answer

The principle of responsibility and supervision.

Question 11

Which of the following is the most important reason for washing your hands before and after working in the microbiology laboratory?

Accepted Answer

To prevent the spread of microorganisms and reduce the risk of infection.

Question 12

Which of the following is NOT considered a biological hazard in the laboratory?

Accepted Answer

Broken glassware.

Question 13

Which of the following best describes the correct procedure for discarding used gloves after handling biological materials?

Accepted Answer

Dispose of them in the designated biohazard waste container.

Question 14

Which of the following is a potential consequence of not labeling your microbial cultures properly?

Accepted Answer

Increased risk of cross-contamination and exposure to unknown hazards.

Question 15

Which of the following is the correct formula for calculating the dilution factor ($$DF) $$when $$V_1 mL of $$stock solution is added to $$V_2 mL of $$diluent?

Accepted Answer

$$DF = \frac{V_1$ + V_2$}{V_1$}$$

Question 16

Which of the following is NOT a recommended laboratory hygiene practice?

Accepted Answer

Touching your face during experiments.

Question 17

A student cleans up a broken glass bottle containing bacteria with a paper towel and throws both the towel and glass into the regular trash. Which two safety rules are being violated?

Accepted Answer

Proper waste disposal and reporting incidents.

Question 18

Which of the following is the best definition of a 'sharps' container in the microbiology laboratory?

Accepted Answer

A puncture-resistant container for disposing of needles, blades, and broken glass.

Question 19

Which of the following is the most important first step if you notice a fire in the laboratory?

Accepted Answer

Alert your instructor and evacuate the area using the nearest exit.

Question 20

Which of the following is a key difference between BSL 2 and BSL 3 laboratories?

Accepted Answer

BSL 3 requires special clothing, controlled access, and directional airflow.

Laboratory Safety in Microbiology: Principles, Practices, and Biosafety Levels

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