MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers

 By daily practicing NCERT MCQ Questions along with Class 8 Science Chapter 6 Combustion and Flame with Answers PDF  Free become perfect. MCQ Questions for Class 8 Science with Answers are make according to CBSE syllabus. The Class 8 MCQ Questions And Answers makes your study skill more better.
  By solving the Combustion and Flame Multiple Choice Question for Class 8 Science Chapter 6 MCQ you become hundred percent perfect in this lesson. The MCQ Questions on Combustion and Flame Class 8 with Answers helps you to give a transparent knowledge.

MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers
Question 1.Lowest ignition temperature has

    A) water
    B) kerosene
    C)spirit
    D) mustard oil

... Answer is C) spirit

Question 2.Which is not a combustible substance

    A) alcohol   
    B) petrol
    C) hydrogen
    D) asbestos

... Answer is D) asbestos

Question 3.Among the following, name the substance which undergo spontaneous combustion

    A) yellow phosphorous
    B) red phosphorous
    C) white phosphorous
    D) brown sulphur

... Answer is C) white phosphorous

Question 4.Sometime there is fire cause in coal mines, this is the example of

    A) explosive combustion
    B) rapid combustion
    C) spontaneous combustion
    D) none of the above

... Answer is C) spontaneous combustion

Question 5.Among them which has highest calorific value

    A) biogas
    B) hydrogen
    C)  LPG
    D) methane

... Answer is

Question 6. Sometime it is found in cold winter night that when a person sleep inside a room closing all windows and doors and burns coal fire to keep the room warm, he will die. This is because the excessive accumulation of the gas called

    A)  carbon dioxide
    B) nitrogen
    C) nitrogen monoxide
    D) carbon monoxide

... Answer is D) carbon monoxide.

Question 7.Among them which is burn without flame

    A) camphor
    B) coke
    C) petrol
    D) candle

... Answer is B) coke

Question 8.The gas responsible for global warming

    A) oxygen
    B) nitrogen
    C) carbon dioxide
    D) sulphur dioxide

... Answer is C) carbon dioxide

Question 9.A gas cause of acid rain is

    A) nitrogen
    B) oxygen
    C) sulphur dioxide
    D) water vapour

... Answer is C) sulphur dioxide.

Question 10.The environment friendly fuel used in automobiles is

    A) petrol
    B) diesel
    C) CNG
    D) LPG

... Answer is C) CNG (compact natural gas)

 
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Question 11.Which is not a example of combustion reaction

    A) production of heat and light during burning of kerosene
    B) production of heat and light from sun
    C) production of heat and light due to burning of petrol
    D) production of heat and light due to burning of wood  

... Answer is B) production of heat and light from sun.

Question 12.A match stick catches fire easily but a log of wood does not catches fire easily because

    A) match stick has low ignition temperature then log of wood
    B)  match stick has high ignition temperature then log of wood
    C) match stick and log of wood both have same ignition temperature
    D) none of the above.

... Answer is A) match stick has log ignition temperature then log of wood.

Question 13.When clothes of a person catches fire then to extinguish fire

    A) we should throw sand over the burning clothes
    B) we should throw water over the burning clothes
    C) we should use polyester clothes to cover the fire
    D) we should use woolen blanket to cover the fire

... Answer is D) we should use woolen blanket to cover the fire.

Question 14.outer most zone of a candle flame is

    A) hottest zone
    B)  coldest zone
    C) moderate zone
    D) none of the above.

... Answer is  A) hottest zone.

Question 15.The colour of  middle zone of a candle flame is

    A) red
    B) blue
    C) white
    D) yellow

... Answer is D) yellow.

Question 16.Number of zone are there in kerosene oil lamp flame

    A) one
    B) two
    C) three
    D) four

... Answer is C) three

Question 17.A powdery chemical is used to extinguish fire. The chemical is

    A) plaster of paris
    B) baking soda
    C) washing soda
    D) bitumen

... Answer is B) baking soda.

Question 18.Among the following which is not a combustible substance

    A) wood
    B) candle
    C) stone
    D) wax

... Answer is C) stone.

Question 19.Petrol is a good fuel then kerosene because its calorific value is

    A) more then kerosene
    B) less then kerosene
    C) equal to kerosene
    D) none of the above.

... Answer is

Question 20.Supporter of combustion is

    A)  nitrogen
    B) carbon dioxide
    C) oxygen
    D) water vapour

... Answer is C) oxygen


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 Write the statement true or false:
 
Question 1. The ignition temperature of LPG is lower than kerosene.

... Answer : false.

Question 2. When the charcoal burns partially it produce carbon dioxide.

... Answer : false

Question 3.When a piece of coke burn completely it produce carbon dioxide.


... Answer : true

Question 4.The coldest zone of a candle flame is inner most zone.


... Answer : true

Question 5.The hottest zone of a candle flame is middle zone.

... Answer : false

Question 6.The colour of the middle zone of a candle flame is blue.

... Answer : false

Question 7.The colour of the outer zone of a candle flame is blue.

... Answer : true

Question 8.The goldsmith use the outer zone that is blue zone of a candle flame to melt gold.

... Answer : true

Question 9.Hydrogen has more calorific value than LPG.

... Answer : true

Question 10.CNG has less calorific value then wood.

... Answer : false

Question 11.LPG stand for liquid petroleum gas.

... Answer : false

Question 12.CNG stand for compressed natural gas.

... Answer : true

Question 13.The more the calorific value the more is the better fuel.


... Answer : true

Question 14.Example of fossil fuel is petroleum.

... Answer : ture

Question 15.Sun gives heat and light. So burning of sun is and example of combustion.

... Answer : false

Question 16.Carbon dioxide is better then water to extinguish electric fire.

... Answer : true

Question 17.Increase in percentage of carbon dioxide in environment is cause of decrease in global warming.

... Answer : false

Question 18.Ignition temperature of a log of wood is more than a matchstick.

... Answer : true

Question 19.Mixture of baking soda and dilute sulphuric acid act as fire extinguisher.

... Answer : true

Question 20.Fire extinguisher acts in two ways to extinguish a fire that is by cutting the supply of oxygen and by cooling down the temperature below its ignition temperature.

... Answer :true

Question 21.The substances which are burn are called non-combustible substances

... Answer : false

Question 22.Oxygen is supporter of combustion.

... Answer : true

Question 23.One of the necessary condition of combustion is heating the combustible substance to its ignition temperature.

... Answer : true

Question 24.One of the important condition for combustion that there is must be a non-combustible substance present.


... Answer : false

Question 25.The minimum temperature at which a combustible substance starts burning is called boiling temperature.


... Answer : false

Question 26.The combustion in which large amount of heat and light is produce is called rapid combustion.

... Answer : True

Question 27.The combustion which occur of its own is called explosive combustion.

... Answer : false

Question 28.The combustion in which large amount of heat, light and sound produce is called explosive combustion.

... Answer : True

Question 29.The amount of heat produce by complete burning of one kilogram of a fuel is called calorific value of that substance.

... Answer : True

Question 30.A good fuel must have very high ignition temperature.

... Answer : false

 
 
 Fill in the blanks:
 
Question 1.A chemical process in which a substance reacts with oxygen and produce heat and light is called ................


... Answer :combustion
Question 2.Oxygen is ...................  of combustion.

... Answer : supporter

Question 3.Respiration a kind of ................  combustion.


... Answer : slow

Question 4.Substances are two types of ............... and .................

... Answer : combustible substance and non-combustible substance

Question 5.The substance which can burn is called ................


... Answer : combustible substance

Question 6.The substance which can not burn is called ..................


... Answer : non-combustible substance


Question 7.Wood is an example of ............ substance.


... Answer : combustible

Question 8.Stone is an example of .............. substance.


... Answer : non-combustible

Question 9.Necessary conditions for combustion are presence of ............ substance, presence of .............. and reaching the substance to its .............. temperature.

... Answer : combustible , oxygen, ignition

Question 10.The minimum temperature at which a substance catch fire is call ............ temperature.

... Answer : ignition

Question 11.LPG has ............ ignition temperature and wood has .......... ignition temperature.

... Answer : low, high


Question 12.There are ............ types of combustion and they are ...............,  .................,    and .................


... Answer : three ,  rapid combustion, spontaneous combustion, explosive combustion

Question 13.The combustion reaction in which large amount of heat and light produce is called ..................

... Answer : rapid combustion

Question 14.The combustion reaction which occurs by of its own is called ...............


... Answer : spontaneous combustion


Question 15.The combustion in which large amount of heat, light and sound produce at once is called ..................

... Answer : explosive combustion

Question 16.The combustible substance which produce large amount of heat is called ................


... Answer : fuel

Question 17.The amount of heat produce during complete combustion of lone kilogram of a fuel is called its ...............


... Answer : calorific value.

Question 18.A good fuel has ............... calorific value.

... Answer : high

Question 19.Kerosene has ............ calorific value than LPG.


... Answer : less

Question 20.The fuels which are vaporises when they burn, they burn with ............


... Answer : flame

Question 21.A candle flame has .............. zone and they are ................,     .......................  and ..................


... Answer : three, innermost zone , middle zone, outer zone.


Question 22.The outer most zone of the candle flame is .......... zone.

... Answer : hottest

Question 23.The inner most zone of a candle flame is ............ zone.


... Answer : coldest

Question 24.Incomplete combustion  of fuel produce a poisonous gas named .............


... Answer : carbon monoxide

Question 25.Complete burning of fuel produce a gas named ............ which cause global warming.

... Answer : carbon dioxide

Question 26.A fuel must be heated to its ........... before starts burning.

... Answer : ignition temperature

Question 27.A liquid fuel used in home is  ............

... Answer : LPG

Question 28.Burning of wood and coal causes ............ of air


... Answer : pollution

Question 29.Example of environment friendly fuel is ................


... Answer :CNG

Question 30.The colour of outer zone of a candle flame is ..................


... Answer : blue


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