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Combustion and Fire Extinguisher- 8A

Total questions: 14

Worksheet time: 7mins

Name
Class
Date
1.

What is combustion?

a)

A type of dance move

b)

The process of freezing water

c)

A method of cooking food

d)

A chemical reaction between a fuel and an oxidizing agent, usually producing heat and light.

2.

List three uses of a fire extinguisher.

a)
  1. Spraying it on a barbecue to enhance the flavour.

  2. Serving as a source of temporary hydration during emergencies.

  3. Acting as a sound amplifier for certain cases.

b)
  1. Using it to water plants. 2. Using the extinguisher as a makeshift vacuum cleaner for small debris. 3. Providing warmth during cold weather by igniting the extinguisher's contents.

c)
  1. Adjusting the pH levels of soil in a garden to promote plant growth.

  1. Applying a reflective coating to surfaces for aesthetic purpose. 3. Enhancing the visual effects of a bonfire during a celebration.

d)
  1. Disrupting the combustion process in ordinary combustibles (Class A).

  2. Smothering and cooling flammable liquid fires (Class B).

  3. Non-conductive suppression of electrical fires (Class C).

3.

How does carbon dioxide cut off the supply of oxygen in a fire?

a)

It increases the amount of oxygen in the surrounding air

b)

It has no effect on the supply of oxygen in a fire

c)

It creates a barrier that prevents oxygen from reaching the fire

d)

It displaces the oxygen in the surrounding air

4.

Name three common fuels used in combustion.

a)

Gasoline, natural gas, wood

b)

Electricity, oil, glass

c)

Coal, diesel, plastic

d)

Propane, paper, hydrogen

5.

Define calorific value in the context of fuels.

a)

The smell of the fuel

b)

The color of the flame produced by the fuel

c)

Amount of heat energy produced by the complete combustion of a unit quantity of fuel

d)

The weight of the fuel

6.

What are the three essential components required for combustion to occur?

a)

Metal, wood, and plastic

b)

Water, air, and light

c)

Cold, darkness, and silence

d)

Fuel, oxygen, and heat

7.

Explain the process of ignition in combustion.

a)

The process of ignition in combustion involves cooling the fuel instead of heating it

b)

Ignition occurs when the fuel is mixed with water instead of oxygen

c)

Combustion is initiated by applying pressure to the fuel

d)

Heat is applied to a fuel in the presence of oxygen, leading to the release of energy in the form of heat and light.

8.

What are the different types of fire extinguishers and their uses?

a)

There are five main types of fire extinguishers: Water and Foam, Carbon Dioxide (CO2), Dry Chemical, Wet Chemical, and Clean Agent. Each type is designed to extinguish specific classes of fires, such as Class A, B, C, D, or K.

b)

Fire extinguishers are all the same and can be used interchangeably for any type of fire.

c)

There are three main types of fire extinguishers: Foam, Wet Chemical, and Clean Agent, each designed for a different type of fire.

d)

There are two main types of fire extinguishers: Water and Dry Chemical, both used for the same types of fires.

9.

How does a fire extinguisher help in controlling a fire?

a)

It spreads the fire by releasing more oxygen

b)

It creates a barrier to prevent the fire from spreading

c)

It increases the temperature of the burning material

d)

It releases chemicals to cool the burning material, displace or remove oxygen, or stop the chemical reaction causing the fire.

10.

Why is it important to understand the different classes of fires when using a fire extinguisher?

a)

To make the fire look more interesting

b)

To use the appropriate type of fire extinguisher for each specific fire.

c)

To have a reason to buy multiple fire extinguishers

d)

To confuse people about which extinguisher to use

11.

Describe the role of carbon dioxide in preventing combustion.

a)

It speeds up the combustion process

b)

It displaces oxygen, which is necessary for combustion to occur.

c)

It increases the temperature needed for combustion

d)

It provides fuel for the fire

12.

What are the safety precautions to be taken while using a fire extinguisher?

a)

Hold the extinguisher upright, pull the pin, aim at the base of the fire, squeeze the handle, and sweep from side to side.

b)

Hold the extinguisher upside down and shake vigorously before using

c)

Use the extinguisher without pulling the pin

d)

Aim the extinguisher at the top of the flames

13.

Explain the concept of flash point in relation to fuels.

a)

The flash point of a fuel is the highest temperature at which it can vaporize to form an ignitable mixture in air.

b)

The flash point of a fuel is the lowest temperature at which it can vaporize to form an ignitable mixture in air.

c)

The flash point of a fuel is the temperature at which it can only burn in the absence of air.

d)

The flash point of a fuel is the temperature at which it can no longer burn in air.

14.

Discuss the importance of understanding the chemistry of combustion for fire safety.

a)

Understanding combustion chemistry leads to more dangerous fire suppression methods

b)

It is only important for designing flammable materials

c)

It helps in predicting and controlling fire behavior, developing effective fire suppression methods, and designing fire-resistant materials and structures.

d)

It has no impact on fire safety measures