Should a security guard always try to put out a fire?

No. Only fight a small fire if you are trained, know what is burning, have the right extinguisher and your exit is behind you. Otherwise pull the alarm, leave and call 911.

Which extinguisher is used most often in offices?

Many buildings use multi-purpose dry chemical extinguishers marked for Class A, B and C fires. Always read the label on the one in front of you.

How do I check an extinguisher on patrol?

Look that it is in place and not blocked, the pin and seal are in place, the gauge reads in the operating range, there is no damage or rust, and the tag is up to date.

Why can't I use water on an electrical fire?

Water conducts electricity, so you could be shocked. Use an extinguisher marked for Class C fires.

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Fire Safety and Extinguisher Use Course 2026

第1题，共25题

Which three things must come together for a fire to start?

Fuel, carbon dioxide and water
Smoke, water and wind
Heat, light and sound
Fuel, heat and oxygen

显示答案

答案: D. Fuel, heat and oxygen

A fire needs fuel, oxygen and heat at the same time. This is often drawn as the fire triangle.

第2题，共25题

How does removing one side of the fire triangle help?

It only changes the colour of the smoke
It turns the fire into a Class D fire
It makes the fire burn more slowly but never stops it
Without fuel, heat or oxygen, the fire cannot keep burning

显示答案

答案: D. Without fuel, heat or oxygen, the fire cannot keep burning

Every way of putting out a fire works by taking away fuel, heat or oxygen.

第3题，共25题

A water extinguisher puts out a fire mainly by doing what?

Cooling the burning material
Removing all the fuel
Adding oxygen
Coating electrical wires

显示答案

答案: A. Cooling the burning material

Water cools burning material below the point where it can keep burning.

第4题，共25题

A carbon dioxide (CO2) extinguisher works mainly by doing what?

Heating the fuel
Leaving a thick foam blanket on paper
Soaking the fuel with water
Smothering the fire by pushing away the oxygen

显示答案

答案: D. Smothering the fire by pushing away the oxygen

CO2 displaces the oxygen around the fire, which smothers it.

第5题，共25题

Which class of fire involves ordinary materials like paper, wood, cloth and many plastics?

Class C
Class K
Class B
Class A

显示答案

答案: D. Class A

Class A fires involve ordinary combustibles such as paper, wood, cloth, rubber and plastics.

第6题，共25题

A fire in spilled gasoline or paint thinner is which class?

Class B
Class D
Class K
Class A

显示答案

答案: A. Class B

Class B fires involve flammable liquids, gases, oils, paints and lacquers.

第7题，共25题

A fire in a plugged-in computer or an electrical panel is which class?

Class D
Class B
Class C
Class A

显示答案

答案: C. Class C

Class C fires involve energized (live) electrical equipment.

第8题，共25题

Which class of fire involves burning metals such as magnesium or sodium?

Class A
Class D
Class K
Class C

显示答案

答案: B. Class D

Class D fires involve combustible metals like magnesium, titanium, sodium and potassium. They need special extinguishing agents.

第9题，共25题

A deep fryer in a restaurant kitchen catches fire. Which class is it?

Class A
Class D
Class K
Class C

显示答案

答案: C. Class K

Class K fires involve cooking oils and fats in cooking appliances.

第10题，共25题

Why must you NOT use a water extinguisher on an electrical fire?

Water is too heavy to spray
Water turns into a flammable gas
Water makes electrical fires burn longer only on weekends
Water conducts electricity, so you could be shocked

显示答案

答案: D. Water conducts electricity, so you could be shocked

Water extinguishers are only for Class A fires. They must not be used on electrical, flammable liquid or cooking oil fires.

第11题，共25题

Which extinguisher type is the right one for a Class K kitchen fire?

Water
Wet chemical
Carbon dioxide only
Class D powder

显示答案

答案: B. Wet chemical

Wet chemical extinguishers are made for cooking oil fires and help prevent re-ignition.

第12题，共25题

An extinguisher labelled for Classes A, B and C is usually which type?

Wet chemical
Multi-purpose dry chemical
Class D powder
Plain water

显示答案

答案: B. Multi-purpose dry chemical

Dry chemical extinguishers cover Class B and C fires, and some types also cover Class A.

第13题，共25题

What is a drawback of using a dry chemical extinguisher in a server room?

It cannot put out any electrical fire
It adds oxygen to the room
It leaves a residue that can damage electrical equipment
It only works on wood

显示答案

答案: C. It leaves a residue that can damage electrical equipment

Dry chemical agents leave a powder residue that can harm sensitive electrical equipment.

第14题，共25题

Why should you take care when using a CO2 extinguisher in a small, closed room?

CO2 makes the room too hot
CO2 is flammable
CO2 conducts electricity
CO2 pushes away oxygen, which can make it hard for you to breathe

显示答案

答案: D. CO2 pushes away oxygen, which can make it hard for you to breathe

Because CO2 displaces oxygen, using it in a confined space needs proper respiratory protection.

第15题，共25题

What does PASS stand for when using a fire extinguisher?

Push, Alert, Spray, Stop
Pull, Aim, Squeeze, Sweep
Point, Aim, Shoot, Stand
Pull, Alarm, Shout, Stay

显示答案

答案: B. Pull, Aim, Squeeze, Sweep

PASS reminds you to pull the pin, aim at the base of the fire, squeeze the handle and sweep side to side.

第16题，共25题

When you use an extinguisher, where should you be standing?

Between the fire and your escape route
On a chair so you can see better
In a corner far from any door
With the fire between you and the exit

显示答案

答案: A. Between the fire and your escape route

Always keep your way out behind you so you can leave if the fire grows.

第17题，共25题

How should you sweep the spray on a fire spreading across the floor?

From the middle outward
Only at the smoke
From the edges inward
Straight up at the ceiling

显示答案

答案: C. From the edges inward

Sweep floor fires from the edges in, so you push the fire back on itself instead of spreading it.

第18题，共25题

The fire seems to be out after you used the extinguisher. What should you do?

Put the empty extinguisher back on its hook
Keep watching it, because it may reignite
Open all the windows and leave
Walk away right away

显示答案

答案: B. Keep watching it, because it may reignite

Never walk away from a fire that seems to be out. Hot material can flare up again.

第19题，共25题

In which situation should you NOT try to fight a fire?

You know what is burning and have the right extinguisher
The fire is tiny and in a wastebasket
The fire is spreading beyond where it started
You are trained and your exit is behind you

显示答案

答案: C. The fire is spreading beyond where it started

Do not fight a fire that is spreading, or if you do not know what is burning or how to use the extinguisher.

第20题，共25题

You cannot put out a fire safely. What should you do?

Pull the fire alarm, evacuate and call the fire department
Keep spraying until the extinguisher is empty
Go back for your belongings
Hide in a washroom until it is out

显示答案

答案: A. Pull the fire alarm, evacuate and call the fire department

If you cannot safely put out the fire, raise the alarm, get out and call the fire department.

第21题，共25题

How often should portable fire extinguishers be visually inspected?

Monthly
Only after a fire
Every day by the fire department
Once every 5 years

显示答案

答案: A. Monthly

CCOHS advises a visual inspection of portable fire extinguishers every month.

第22题，共25题

How often should portable fire extinguishers be serviced?

Only when they are empty
Never, they last forever
At least once a year, or sooner if the monthly check finds a problem
Every 10 years

显示答案

答案: C. At least once a year, or sooner if the monthly check finds a problem

Extinguishers should be serviced at least yearly, or whenever an inspection shows servicing is needed.

第23题，共25题

On patrol, you find an extinguisher with a badly rusted, pitted cylinder. What should happen?

Move it to a different floor
Report it so it can be taken out of service and replaced
Leave it, because rust does not matter
Paint over the rust

显示答案

答案: B. Report it so it can be taken out of service and replaced

Corrosion that causes pitting is a reason to remove an extinguisher from service.

第24题，共25题

Which is a good way to store flammable liquids at a site?

In a cool, well-ventilated place using proper flammable storage equipment
In a hot basement next to the furnace
In large open buckets in a hallway
On top of electrical panels

显示答案

答案: A. In a cool, well-ventilated place using proper flammable storage equipment

Store flammables in a cool, ventilated place in proper storage equipment, avoid large amounts, and avoid basements.

第25题，共25题

Which patrol finding is a fire hazard you should report?

A closed fire door
Cardboard boxes piled against a furnace room heater
A fire extinguisher mounted on its hook
A clear exit corridor

显示答案

答案: B. Cardboard boxes piled against a furnace room heater

Combustibles near heat sources can start fires. Report and, if allowed, correct poor housekeeping.

Fire Safety and Extinguisher Use Course 2026

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