Science & STEM

What to do if a laboratory fire erupts: lab fire safety quiz

Moderate2-5mins

This quiz helps you practice what to do if a laboratory fire erupts and make quick, safe choices in the first minutes. Use it to spot gaps, handle flammables wisely, and know when to evacuate or suppress a small flame. For broader practice, try the chemistry lab safety quiz, review the fire extinguisher safety quiz, or take a laboratory safety test.

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1What is the first action you should take if you see a small, controllable fire in the lab?
2Which class of fire extinguisher is used for flammable liquid fires?
3Which type of extinguisher should NOT be used on electrical fires?
4What does the acronym PASS stand for when using a fire extinguisher?
5If a coworker's clothing catches fire, what is the recommended response?
6What safety equipment must always be easily accessible in the lab?
7Flammable liquids should be stored in which type of cabinet?
8The 'fire triangle' consists of fuel, heat and what third element?
9Before lighting a Bunsen burner, you should always do what?
10When you hear the fire alarm in the lab, what should you do?
11What item is specifically designed to extinguish a small fire on a person?
12What color band designates a CO2 fire extinguisher?
13What is the maximum amount of flammable liquids allowed outside a flammable storage cabinet in a typical lab area?
14What class of fire is characterized by burning metal and requires a Class D extinguisher?
15Which agent is best for extinguishing a sodium metal fire?
16By using a dry chemical fire extinguisher, which element of the fire triangle are you primarily removing?
17Before leaving the lab, what must you do with any open gas lines?
18The Lower Explosive Limit (LEL) defines what?
19In the event of a fire inside a chemical fume hood, what is the recommended first step?
20The flash point of a liquid is the lowest temperature at which it will produce enough vapor to what?
21Why might using CO2 extinguishers in a sealed lab room pose an additional hazard?
22Which type of chemical should NOT be stored in a flammable storage cabinet?
23What training should laboratory personnel receive regarding fire extinguishers?
24What is the safe headspace to leave when filling a flammable solvent waste container?
25Why should you not use water (Class A extinguisher) on a Class B (flammable liquid) fire?
26What type of ventilation system helps prevent the buildup of flammable vapors in the lab?
27According to NFPA 30, what clearance must be kept between stored flammable liquids and overhead sprinkler deflectors?
28What is the proper method to dispose of small quantities of flammable solvent waste?
29When transferring flammable liquids between containers, what practice helps prevent static discharge?
30While transporting flammable chemicals on a cart, which is required?
31What device prevents a flame from traveling back into gas supply lines?
32Under NFPA definitions, liquids with a flash point below what temperature are classified as highly flammable?
33How should compressed gas cylinders be stored relative to flammable solvent cabinets?
34In the NFPA 704 diamond, what hazard does the blue quadrant represent?
35What is the maximum fill level for a safety can used for flammable solvents?
36Which OSHA regulation requires employers to provide portable fire extinguisher training?
37What mechanism does foam use to suppress flammable liquid fires, and why is the foam expansion ratio critical?
38Why must labs using inert gas flooding systems incorporate oxygen deficiency hazard (ODH) monitoring, and which standard governs this requirement?
39How does deflagration differ from detonation in vapor cloud fires, and which lab design feature mitigates the risk of deflagration pressure buildup?
40When designing laboratory ventilation to control flammable vapors, why are both lower explosive limit (LEL) and upper explosive limit (UEL) important?
Learning Goals

Study Outcomes

  1. Apply Fire Emergency Procedures -

    Describe the immediate steps to take if a laboratory fire erupts immediately, including alarm activation, evacuation routes, and use of fire extinguishers.

  2. Demonstrate Safe Handling of Flammable Materials -

    Show correct practices for storing, transferring, and disposing of flammables like alcohol to minimize fire and spill risks.

  3. Explain Responsible Burner Operation -

    Clarify why you should never leave a lit burner unattended and how to monitor heat sources throughout an experiment.

  4. Maintain Proper Personal Protective Equipment -

    Recognize the necessity of wearing laboratory aprons during all lab activities and selecting proper eye protection to guard against splashes and sparks.

  5. Outline Procedures for Incomplete Experiments -

    Detail the steps to follow if a lab experiment is not completed you should, including safe shutdown, labeling, and cleanup processes.

  6. Secure Long Hair in the Laboratory -

    Identify hazards posed by loose hair and demonstrate how long hair in the laboratory must be tied back to prevent contact with flames and chemicals.

Study Guide

Cheat Sheet

  1. PASS Fire Extinguisher Technique -

    If a laboratory fire erupts immediately, use the PASS method (Pull, Aim, Squeeze, Sweep) endorsed by NFPA for effective extinguisher use. This clear framework helps you respond calmly and efficiently to contain small fires. A handy mnemonic - "Pull and Aim, then Squeeze out Flame" - locks in each step under stress.

  2. Safe Burner Practices -

    Never leave a lit burner unattended; OSHA studies highlight that unattended Bunsen burners are a leading cause of lab fires. Always stay within arm's reach and adjust the flame to a gentle blue cone to minimize flare-ups. Label a "Done?" zone on your bench so you remember to turn off heat sources before stepping away.

  3. Mandatory PPE: Aprons and Eye Protection -

    Laboratory aprons should be worn during all lab activities to shield skin and clothing from chemical splashes and heat. Pair aprons with ANSI-approved goggles or face shields - CDC lab safety guides note that eye injuries drop by 90% with consistent eye protection. Store PPE in a dedicated clean zone to encourage regular use.

  4. Securing Hair and Loose Clothing -

    Long hair in the laboratory must be tied back to prevent it from igniting or dipping into chemicals; NIH protocols emphasize secure buns or low ponytails. Use a simple mnemonic like "HAIR - Hold Away In Restricted zones" to recall the rule every time you enter the bench area. Tuck in loose sleeves, and avoid scarves or lanyards near open flames.

  5. Proper Shutdown for Incomplete Experiments -

    If a lab experiment is not completed you should follow shutdown protocols: turn off electrical and gas sources, lock up reagents, and label your workspace with hazard details. According to ACS guidelines, this prevents accidental reactions overnight and ensures colleagues can safely restart. Keep a log of completed steps and pending actions for quick handoff.

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Michael HodgeEdTech Product Lead & Assessment Design SpecialistQuiz Maker
Updated Feb 21, 2026