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