Combustion

Water is not used to control fires involving electrical appliances.

• False
• True

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

Pouring water on a fire takes out which factor from the fire triangle?

• Heat

• Oxygen

• Fuel

• None of them

Covering a grease fire with a lid/fire blanket takes out which factor from the fire triangle?

• Heat

• Oxygen

• Fuel

• None of them

Cutting trees down in a forest fire takes out which factor from the fire triangle?

• Heat

• Oxygen

• Fuel

• None of them

In an experiment designed to test for the effect of the height of a candle on its blow out time, the independent variable is...

• The height of the candle

• The type of the candle

• The time it took the flame to blow out

• None of them

In an experiment designed to test for the effect of the height of a candle on its blow out time, the dependent variable is...

• The height of the candle

• The type of the candle

• The time it took the flame to blow out

• None of them

In an experiment designed to test for the effect of the height of a candle on its blow out time, the control variable is...

• The height of the candle

• The type of the candle

• The time it took the flame to blow out

• None of them

In an experiment designed to test for the effect of the height of a candle on its blow out time, the control variable is...

• The height of the candle

• The size of the beaker

• The time it took the flame to blow out

• None of them

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

• fuel
• ignition temperature
• oxygen
• all of these