CBSE Questions for Class 8 Chemistry Combustion And Flame Quiz 2 - MCQExams.com

Which of the following is non-combustible?
  • Sand
  • Iron
  • Glass
  • All of the above
Which of the following releases least amount of pollutants on combustion?
  • Diesel
  • Coal gas
  • C.N.G
  • None of these
How water controls fire?
  • By suppressing oxygen supply
  • By cooling the burning material
  • By reducing the area over which the fire exists
  • All of the above
How many zones are present in candle flame? 
  • 2
  • 3
  • 4
  • 5
Why electrical equipment on burning do not extinguished fire by water? 
  • Water shows exothermic reaction with electrical equipment.
  • Water conduct electricity with electrical equipment's.
  • Water shows endothermic reaction.
  • Water is a combustible substance.
The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is:
  • sublimation as well as chemical reaction with oxygen
  • only sublimation
  • not sublimation but a chemical reaction with oxygen
  • none of above
For burning, ....... is needed.
  • water
  • air
  • soil
  • land
A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
  • Iron nail
  • Glass
  • Stone piece
  • Wood
Which of the following substances does not burn with a flame?
  • LPG
  • Camphor
  • Dry grass
  • Charcoal
What is the best way to extinguish fire, if a person's clothes catch fire?
  • Throw water on the clothes.
  • Use fire extinguisher.
  • Cover the person with a woollen blanket.
  • Cover the person with a polythene sheet.
On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of:
  • oxygen
  • water vapour
  • carbon dioxide
  • wax
Which one of the following has the highest calorific value?
  • Kerosene
  • Biogas
  • LPG
  • Petrol
Choose the correct statement about inflammable substances from the following statements. They have:
  • low ignition temperature and cannot catch fire easily
  • high ignition temperature and can catch fire easily
  • low ignition temperature and can catch fire easily
  • high ignition temperature and cannot catch fire easily
The essential constituent of all fuel gases is:
  • $$CO_{2}$$
  • $$N_{2}$$
  • $$CO$$
  • $$CH_{4}$$
Choose the incorrect statement from the following.
Forest fires are usually due to ______________.
  • Carelessness of humans
  • Heat of sun
  • Cutting of trees
  • Lightning strike
The calorific value of a fuel is expressed in a unit called as ______________.
  • kilojoule per litre
  • kilogram per mililitre
  • kilojoule per gram
  • kilojoule per kilogram
Which of the following is not a combustible substance?
  • Camphor
  • Glass
  • Straw
  • Alcohol
State True or False.
Oxygen is necessary for combustion.
  • True
  • False
The greater the _____, better is the fuel.
  • non-combustible matter
  • moisture content
  • calorific 
  • None of these
In villages, people use wood as a fuel because:
  • it is considered to be an ideal fuel
  • of its easy availability and low cost
  • it is environment friendly
  • it catches fire easily
A chemical process in which a substance reacts with oxygen to give off heat is called as:
  • endothermic
  • combustion
  • reduction
  • none of the above
State whether the following statement is true or false:
Water is the best extinguisher for fire involving electrical equipments.
  • True
  • False
The substances which vapourise during burning produce a flame.
  • True
  • False
Which fuel used in jet crafts?
  • Car pertrol
  • CNG
  • Kerosene
  • Deiseal
Middle zone is the hottest zone of a flame.
  • True
  • False
CNG and LPG are ________ substances.
  • highly toxic
  • inflammable
  • inexhaustible
  • none of these
A good fuel has these qualities :
  • should have high calorific value
  • should be costly
  • should cause pollution
  • should be easy to transport
Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to:
  • proper combustion of fuel
  • improper cooking of potato curry
  • improper combustion of the fuel
  • burning of copper vessel
We cannot use a fire extinguisher that involves _____ as an extinguishing substance.
  • carbon dioxide
  • baking soda
  • foam
  • petrol
Oxygen is a _____ gas.
  • non-combustible
  • combustible
  • monoatomic
  • coloured
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