Fire prevention: why it matters
Fire on a construction site spreads fast through timber, packaging, fuels and gas cylinders, often with limited escape routes. Preventing ignition is far more effective than fighting a fire once it starts.
The key idea is the fire triangle: heat, fuel and oxygen. Remove any one side and the fire cannot continue. Hot works, careless storage and poor housekeeping are the usual causes, so the test focuses on controlling them.
Fire prevention revision notes
Most fire questions come back to two things: the fire triangle and matching the right extinguisher to the fire. Learn the points below and you can reason out the answer rather than memorise it.
The fire triangle
Fire needs heat, fuel and oxygen. Prevention and firefighting both work by removing one side, cooling (water), starving (removing fuel) or smothering (excluding oxygen).
Fire classes
A: solids (wood, paper). B: flammable liquids. C: gases. D: metals. F: cooking oils and fats. Electrical fires are not a class, the danger is the live current.
Match the extinguisher
Water (red label) for class A. Foam (cream) for A and B. CO2 (black) for electrical and B. Dry powder (blue) for A, B, C and electrical. Wet chemical (yellow) for class F.
Never the wrong type
Water on a liquid or electrical fire is dangerous. CO2 on cooking oil will not put it out. Using the wrong extinguisher can spread the fire or cause electrocution.
Hot works permits
Welding, cutting and grinding need a hot works permit, a clear area, a fire watch during and after the work, and the right extinguisher to hand.
If a fire starts
Raise the alarm first. Only tackle a small fire if it is safe and you are trained. Leave by the nearest escape route, do not use lifts, and go to the assembly point for the roll call.
Hear a question in Polish
Fire questions often hang on a single detail, an extinguisher colour or which side of the triangle a control removes. Press Play in Polish below to hear a real question read aloud while you follow the English.
What is the primary purpose of a fire extinguisher on a construction site?
To create a barrier against smoke
To suppress dust particles
To extinguish or control small fires
To signal fire alarms
Every wrong answer can also come with an AI explanation that points to the specific rule behind the correct answer, so you learn from each mistake instead of just memorising. Native Polish audio and AI explanations are two things you will not find on other CSCS practice sites.
Fire prevention quiz, five questions
Five fire prevention questions in the real CITB format. Look out for the extinguisher and hot works questions, the ones most people get wrong. Answer each one and it is marked straight away, with the reason it is right.
0 of 5 answered
Score: 0 / 5
Q1. Which type of fire extinguisher is suitable for electrical fires?
Reveal explanation
Correct answer: C. CO2
CO2 extinguishers are safe for use on electrical fires as they do not conduct electricity.
Q2. What is a key method to prevent fires on construction sites?
Reveal explanation
Correct answer: B. Ensure all electrical equipment is tested regularly
Regular testing of electrical equipment helps to identify potential fire risks.
Q3. Before using a fire extinguisher, what should you always check?
Reveal explanation
Correct answer: A. Its expiry date
Checking the expiry date is crucial as extinguishers can lose pressure over time.
Q4. Why is it important to keep fire exits clear on-site?
Reveal explanation
Correct answer: B. To allow quick escape during a fire
Clear fire exits ensure safe and quick evacuation in case of fire.
Q5. What is the fire triangle?
Reveal explanation
Correct answer: B. A model outlining required elements for combustion
The fire triangle consists of heat, fuel, and oxygen, which are necessary for fire.
Answer all five to see how you did on fire prevention
The real CITB test is 50 questions in 45 minutes, with a 45 out of 50 pass mark. Our free mock test uses the same format and needs no account.
Common mistakes
These fire mistakes turn a small, containable fire into a serious one. Unlearn them before the test, and before you pick up an extinguisher for real.
Mistake 1: “Use water on any fire.”
Correct: Water conducts electricity and makes burning liquids or oils spread violently. Use CO2 or dry powder on electrical, foam on flammable liquids, and wet chemical on cooking oils.
Mistake 2: “Fight the fire before raising the alarm.”
Correct: Raise the alarm and make sure people can get out first. Only then, and only if the fire is small and you are trained, should you consider tackling it. Your life comes before property.
Mistake 3: “Gas cylinders are fine left in the sun.”
Correct: Heat raises the pressure in cylinders and can cause them to burst or rocket. Store cylinders upright, secured, in a ventilated area away from heat and ignition sources.
Related CSCS topics
Fire risk ties into other hazards on site, from live circuits to stored chemicals. These related topics round out the picture: