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Types of Fire Extinguishers and Their Uses

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Questions and Answers

What is the advantage of using carbon dioxide as a fire extinguisher?

It causes the combustion of materials rather than extinguishing the fire.
It is less effective on electrical fires compared to other types of fires.
It is cheaper than other types of fire extinguishers.
It is lighter than air and surrounds the burning substance like a blanket. (correct)

How does a foam-type fire extinguisher work?

It contains pure water to put off fires by cooling down the flame.
It creates a barrier between the fire and oxygen, preventing combustion.
It is filled with a saturated solution of sodium bicarbonate and aluminium sulphate to suppress fires. (correct)
It releases oxygen to support the combustion process and extinguish fires.

Why is sand mentioned as an option to put off fires?

To release carbon dioxide and cool down the flames.
To absorb heat and smother the fire by cutting off the oxygen supply. (correct)
To react with the burning material and create a non-combustible compound.
To create a barrier between the fire and oxygen.

Which statement best describes the function of pouring water over a burning body?

Water cools down the body to prevent combustion at high temperatures. (C) Signup and view all the answers

Why is carbon dioxide considered effective for fires involving electrical inflammable materials?

It is lighter than air and easily penetrates electrical components to extinguish fires. (B) Signup and view all the answers

How does carbon dioxide differ from water in terms of extinguishing fires?

Carbon dioxide cuts off the oxygen supply, while water directly reacts with burning material to stop combustion. (A) Signup and view all the answers

Why is water effective as a fire extinguisher?

Water creates a barrier of water vapor around the combustible material, cutting off the air supply. (C) Signup and view all the answers

Why can't water be used to extinguish fires caused by burning oil or petrol?

Water is lighter than oil or petrol, so it floats on top and does not extinguish the fire. (A) Signup and view all the answers

Why is water not suitable for extinguishing fires in electric wiring?

Water conducts electricity and can lead to electric shocks or electrocution. (C) Signup and view all the answers

How does water help in preventing the spread of fire?

By forming water vapor to cut off the air supply to the fire. (D) Signup and view all the answers

What role does water play in a firefighting operation?

To cool down the combustible substance below its ignition temperature. (B) Signup and view all the answers

Why is using water to extinguish fires caused by burning oil or petrol ineffective?

Water mixes with oil/petrol and creates toxic fumes. (A) Signup and view all the answers

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