Combustion part 1

The materials which produce heat energy on burning in air are called

• fuels

• inflammable materials
• non-combustible materials
• flammable materials

Which of the following is the property of combustible materials?

• catch fire easily

• heated in the presence of air

• produce heat and light energy

• all of these

A fuel may be

• solid

• liquid

• gaseous

• all of these

Fuel for our body is

• blood

• cloths

• food

• none of these

Candle burns smoothly because of

• better quality of wax

• sufficient supply of air from atmosphere

• supply of air is completely cut off

• insufficient supply of air

The candle flame is put off because

• supply of air is completely cut off

• insufficient supply of air

• poor quality wax

• sufficient supply of air

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

Which is not combustible substance

• Wood
• Cow dung cake
• stone
• paper

The word equation for combustion is: fuel + oxygen --> water + ________ __________

• Carbon dioxide
• Limewater

Burning of charcoal in a closed room will produce

• Carbon dioxide

• Nitrogen dioxide

• Carbon monoxide

• Sulphur dioxide