7.2 COMBUSTION

The condition which are required for combustion to take place are:

• fuel

• heat

• oxygen

• all of these

Why the candle flame is extinguished when the boy blow?

• The saliva from the boy put off the flame

• The oxygen is removed from the flame

What does this hazard symbol means?

• The substance is explosive

• The substance burns easily

• The substance supplies oxygen to fires

• The substance puts out fires

Which one of the following is not a fossil fuel?

• Wood

• Coal

• Petroleum

• Natural Gas

Why do we use water to extinguish fire?

• To removed the oxygen

• To removed the fuel

• To removed the heat

Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?

• Water
• Carbon Dioxide 
• Dry Chemical
• Foam

Combustion from solid (wood, paper, cloth) can be extinguish using extinguisher type

• water and dry powder

• dry powder and foam

• foam

• carbon dioxide and water

Combustion from liquid (oil, paint, varnish) can be extinguish using extinguisher type

• water, foam, carbon dioxide

• dry powder, foam, carbon dioxide

• foam only

• carbon dioxide and water

Combustion from gases (butane,acetylene) can be extinguish using extinguisher type:

• water and dry powder

• dry powder and carbon dioxide

• foam and dry powder

• carbon dioxide and foam

combustion from metal (potassium,natrium, ,acetylene) can be extinguish using extinguisher type

• water
• dry powder
• foam
• carbon dioxide