Refer to CBSE Class 8 Science Combustion and Flame MCQs provided below available for download in Pdf. The MCQ Questions for Class 8 Science with answers are aligned as per the latest syllabus and exam pattern suggested by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 6 Combustion and Flame are an important part of exams for Class 8 Science and if practiced properly can help you to improve your understanding and get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 8 Science and also download more latest study material for all subjects
MCQ for Class 8 Science Chapter 6 Combustion and Flame
Class 8 Science students should refer to the following multiple-choice questions with answers for Chapter 6 Combustion and Flame in Class 8.
Chapter 6 Combustion and Flame MCQ Questions Class 8 Science with Answers
Question. Combustion is a reaction in which a Substance reacts with-
(a) Hydrogen
(b) Nitrogen
(c) Oxygen
(d) Chlorine
Answer : C
Question. Fuel may be-
(a) Solid
(b) Liquid
(c) Gas
(d) All of these
Answer : D
(a) Paper
(b) Stone pieces
(c) Glass
(d) Iron nail
Question. Combustion is a
(a) Chemical process
(b) None of the options
(c) Both Chemical process and Physical process
(d) Physical process
Question. Which one of the following is fuel of our body?
(a) Food
(b) Water
(c) Diesel
(d) Petrol
Question. Which one of the following is fuel of our body?
(a) Petrol
(b) Diesel
(c) Food
(d) Water
Answer : C
Question. Combustion is a-
(a) Physical process
(b) Chemical process
(c) Both (a) & (b)
(d) None of these
Answer : B
Question. Which one of the following is combustible?
(a) Iron nail
(b) Glass
(c) Stone pieces
(d) Paper
Answer : D
Question. The lowest temperature at which a Substance catches fire is called its-
(a) Boiling point
(b) Melting point
(c) Ignition temperature
(d) Critical temperature
Answer : C
Question. Which of the following is inflammable Substances?
(a) Petrol
(b) Wood
(c) Paper
(d) Straw
Answer : A
Question. Essential requirements for producing fire are:
(a) Fuel
(b) Air
(c) Heat
(d) All of these
Answer : D
Question. Fire extinguisher-
(a) Cut off the supply of air
(b) Bring down the temperature of fuel
(c) Both (a) & (b)
(d) None of these
Answer : C
Question. For combustion ________is necessary
(a) Air
(b) Water
(c) Paper
(d) Fuel
Answer : A
Question. Rapid combustion is
(a) When gas burns, it produces heat and light
(b) When material suddenly burst into flames
(c) When there is evolution of heat
(d) None of these
Answer : A
Question. Which fuels are used for running automobiles?
(a) Wood
(b) Coal
(c) Diesel
(d) Charcoal
Answer : C
Question. When magnesium ribbon burnt it produce
(a) Magnesium hydroxide
(b) Magnesium oxide
(c) Magnesium chloride
(d) Magnesium sulphate
Answer : B
(a) CO2
(b) O2
(c) H2
(d) CO
Question. When magnesium ribbon burnt it produce
(a) Magnesium oxide
(b) Magnesium chloride
(c) Magnesium sulphate
(d) Magnesium hydroxide
Question. Which fuels are used for running automobiles?
(a) Diesel
(b) Charcoal
(c) Coal
(d) Wood
Question. Charcoal burns in air producing-
(a) CO2
(b) CO
(c) H2
(d)O2
Answer : A
Question. Explosion is the evolution of
(a) Heat
(b) light
(c) Sound
(d) All of these
Answer : D
Question. Substance which vaporise during Burning gives
(a) Sound
(b) Flame
(c) Combustion
(d) None of these
Answer : B
Question. Which is the hottest part in the flame of the candle
(a) Blue
(b) Yellow
(c) Black
(d) Wax part
Answer : A
Question. Innermost zone is the
(a) Hottest part
(b) Moderately hot part
(c) Least hot part
(d) Cold part
Answer : C
Question. Incomplete combustion gives
(a) CO2
(b) CO
(c) Carbon
(d) None of these
Answer : B
Question. Goldsmith uses ____part of the flame for melting gold
(a) Outermost
(b) Middle
(c) Innermost
(d) Both (b) & (c)
Answer : A
Question. A chemical process in which a substance reacts with oxygen to give off heat is called
(a) Conduction
(b) Conjunction
(c) Combustion
(d) Confusion
Answer : C
Question. Fuel may be
(a) Solid only
(b) Solid,Liquid or gas
(c) Liquid only
(d) Gas only
Answer : B
Question. The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.
(a) 1 litre
(b) 1 Kg
(c) 1 milli litre
(d) 1 gram
Answer : B
Question. The substances which have very low ignition temperature and can easily catch fire with a flame are called
(a) Inflammable substances
(b) Flaming substance
(c) Fire proof substance
(d) None of the above
Answer : A
Question. When we heat water in a paper bowl over a candle, the paper does not catch fire because
(a) Paper is not inflamable
(b) Paper gets wet
(c) Due to water the ignition temperature of paper is not reached
(d) This is not possible
Answer : C
Question. When oil or petrol catches fire, water is not used to extinguish it because
(a) Water covers oil and oil burns under water layer which may not be noticeable
(b) Water is heavier than oil / petrol and so remains below the oil layer which continues to burn
(c) Water get mixed with oil and increases fire
(d) Water gets evaporated
Answer : B
Question. In combustion
(a) Both heat and light is produced
(b) Only heat is produced
(c) Only light is produced
(d) All are correct
Answer : A
Question. A person caught fire on clothes is wrapped with blanket because
(a) The person suddenly feels cold
(b) To hide the burnt body parts
(c) The person’s clothes gets burnt
(d) To reduce air supply and put fire off
Answer : D
Question. Ignition temperature is
(a) The maximum temperature at which a substance catches fire
(b) The minimum temperature at which a substance catches fire
(c) The temperature of burning substance
(d) The temperature in the substance when fire if put off
Answer : B
Question. Explosion takes place because of
(a) Release of large amount of gas under pressure due to sudden reaction
(b) Release of large amount of heat
(c) Release of large amount of light
(d) None of the above
Answer : A
(a) Three
(b) Two
(c) Four
(d) None of the options
(a) Carbon dioxide and water
(b) Oxygen and water
(c) Only carbon dioxide
(d) Only oxygen
Question. Combustion is a
(a) Chemical process
(b) Physical process
(c) Chemical process and physical process
(d) None of the options
Question. Ignition temperature is
(a) Lowest temperature at catch fire
(b) Higher temperature at catch fire
(c) Any temperature
(d) None of the options
Question. CNG and LPG are the examples of
(a) Gaseous fuels
(b) Solid fuels
(c) Liquid fuels
(d) They are not fuels
Question. The substances which have very low ignition temperature will
(a) Catch fire easily
(b) Will not catch fire
(c) Catch fire after some time
(d) None of the options
Question. Burning of charcoal in a closed room will produce
(a) Carbon monoxide
(b) Carbon dioxide
(c) Nitrogen dioxide
(d) All of these
Question. Coal burns with ______
(a) Only glow
(b) Flame
(c) Flame and only glow
(d) None of the options
Question. Like fuel the sun also provides heat and light. The process taking place in the sun is called
(a) Nuclear process
(b) Combustion
(c) Burning
(d) All of these
Question. Which substance give heat and light after combustion
(a) Fuel
(b) Flame
(c) Ombustion
(d) None of the options
Question. Which of the following has lower ignition temperature?
(a) Kerosene oil
(b) Vegetable oil
(c) Paper
(d) Wood
Question. The lowest temperature at which a Substance catches fire is called its
(a) Ignition temperature
(b) Critical temperature
(c) Melting point
(d) Boiling point
Question. Fuel may be
(a) All of the options
(b) Gas
(c) Liquid
(d) Solid
Question. Combustion is a reaction in which a Substance reacts with
(a) Oxygen
(b) Chlorine
(c) Nitrogen
(d) Hydrogen
Question: Which is the hottest part in the flame of the candle
a) Blue
b) Wax part
c) Black
d) Yellow
Answer: Blue
Question: Substance which vaporise during Burning gives
a) Flame
b) None of the options
c) Combustion
d) Sound
Answer: Flame
Question: Explosion is the evolution of
a) All of the options
b) Sound
c) Light
d) Heat
Answer: All of the options
Question: Rapid combustion is
a) When gas burns, it produces heat and light
b) None of the options
c) When there is evolution of heat
d) When material suddenly burst into flames
Answer: When gas burns, it produces heat and light
Question: For combustion______is necessary
a) Air
b) Fuel
c) Paper
d) Water
Answer: Air
Question: Fire extinguisher-
a) Both Bring down the temperature of fuel and Cut off the supply of air
b) None of the options
c) Bring down the temperature of fuel
d) Cut off the supply of air
Answer: Both Bring down the temperature of fuel and Cut off the supply of air
Question: Essential requirements for producing fire are
a) All of the options
b) Heat
c) Air
d) Fuel
Answer: All of the options
Question: Which of the following is inflammable Substances?
a) Petrol
b) Straw
c) Paper
d) Wood
Answer: Petrol
Question: In the presence of water, ignition Temperature of paper is
a) Decrease
b) None of the options
c) Remain constant
d) Increase
Answer: Decrease
Question: Which one of the following is non Combustible?
a) Stone piece
b) Matchsticks
c) Straw
d) Paper
Answer: Stone piece
Question: Calorific value gives the
a) Fuel efficiency
b) None of the options
c) Amount of light
d) Amount of heat
Answer: Fuel efficiency
Question: Ideal fuel has______calorific value
a) High
b) Zero
c) Moderate
d) Low
Answer: High
Question: The most common fire extinguisher is
a) Water
b) Hydrogen
c) Oxygen
d) CO2
Answer: Water
Question: During the process of combustion______is given out
a) Both heat & light
b) Sound
c) Light
d) Heat
Answer: Both heat & light
Question: Use of______in vehicle reduces pollution
a) CNG
b) None of the options
c) Diesel
d) Petrol
Answer: CNG
Question: Which is better domestic fuel
a) LPG
b) Coal
c) Wood
d) CNG
Answer: LPG
Question: On burning fuel produces______amount of heat
a) Large
b) No heat
c) Very less
d) Less
Answer: Large
Question: Good fuel is
a) All of the options
b) Burn easily in air
c) Cheap
d) Readily available
Answer: All of the options
Question: Yellow colour in the flame denotes
a) Middle zone
b) None of the options
c) Innermost zone
d) Outermost part
Answer: Middle zone
Question: Innermost zone is the
a) Least hot part
b) Cold part
c) Moderately hot part
d) Hottest part
Answer: Least hot part
Question: Burning of coal and diesel releases
a) SO2
b) CO
c) CO2
d) NO2
Answer: SO2
Question: Global warming is caused due to______concentration of Co2 in air
a) Increased
b) None of the options
c) Both Increased and Decreased
d) Decreased
Answer: Increased
Question: Combustion of most fuels releases
a) CO2
b) Oxygen
c) NO2
d) SO2
Answer: CO2
Question: Which of the following is/are carbon fuel
a) All of the options
b) Petroleum
c) Coal
d) Wood
Answer: All of the options
Question: Element showing spontaneous combustion is
a) Lithium
b) Copper
c) Phosphorous
d) Calcium
Answer: Lithium
Question: Amount of heat energy produced on______combustion of 1kg of fuel is Calorific value
a) Complete
b) None of the options
c) Half
d) Incomplete
Answer: Complete
Question: Goldsmith uses______part of the flame for melting gold
a) Outermost
b) Innermost, Middle
c) Innermost
d) Middle
Answer: Outermost
Question: Incomplete combustion gives
a) CO
b) None of the options
c) CO2
d) Carbon
Answer: CO
Question: Unburnt carbon particles causes
a) Respiratory problems
b) Throat problems
c) Brain infections
d) Stomach infections
Answer: Respiratory problems
Question: Calorific value is measured in
a) Kilo joule per Kg
b) Kilometre
c) Kilograms
d) Kilo joule
Answer: Kilo joule per Kg
Question: Water is not suitable for fire involving
a) Both Petrol and Oil
b) None of the options
c) Petrol
d) Oil
Answer: Both Petrol and Oil
Question: CO2 is given off by chemicals like
a) Sodium bicarbonate
b) Sulphuric acid
c) Sodium sulphate
d) Calcium sulphate
Answer: Sodium bicarbonate
Question: CO2 is stored as a liquid in cylinder at
a) High pressure
b) Low pressure
c) High temperature
d) Low temperature
Answer: High pressure
Question: Best extinguisher for inflammable Materials is
a) CO2
b) CO
c) SO2
d) Water
Answer: CO2
Question: When the match struck against rubbing surface, red phosphorous
a) Converts into white phosphorous
b) Reacts with potassium chlorate
c) None of the options
d) Ignite antimony trisulphide
Answer: Converts into white phosphorous
Question: The head of the safety match contains
a) Both Potassium Chlorate and Antimony trisulphide
b) None of the options
c) Potassium Chlorate
d) Antimony trisulphide
Answer: Both Potassium Chlorate and Antimony trisulphide
Question: In the sun, heat and light are produced by
a) Nuclear reactions
b) None of the options
c) Ionic reactions
d) Chemical reactions
Answer: Nuclear reactions
Question: Which is a solid fuel?
a) Wax
b) Wood
c) Diesel
d) Petrol
Answer: Wax
Question: Acid rain is caused by oxides of
a) Sulphur, Nitrogen
b) Sulphur, Carbon
c) Phosphorous, Carbon
d) Carbon, Nitrogen
Answer: Sulphur, Nitrogen
Question: Petrol engine gives off gaseous oxides of
a) Nitrogen
b) Carbon
c) Phosphorous
d) Sulphur
Answer: Nitrogen
Question: Water is not suitable for fire involving
a) Petrol and Oil
b) Petrol
c) Oil
d) None of the options
Answer: Petrol and Oil
Question: CO2 is given off by chemicals like
a) Sodium bicarbonate
b) Calcium sulphate
c) Sulphuric acid
d) Sodium sulphate
Answer: Sodium bicarbonate
Question: CO2 is stored as a liquid in cylinder at
a) High pressure
b) Low pressure
c) High temperature
d) Low temperature
Answer: High pressure
Question: Best extinguisher for inflammable Materials is
a) CO2
b) SO2
c) Water
d) CO
Answer: CO2
Question: When the match struck against rubbing surface, red phosphorous
a) Converts into white phosphorous
b) Reacts with potassium chlorate
c) Ignite antimony trisulphide
d) None of the options
Answer: Converts into white phosphorous
Question: The head of the safety match contains
a) Potassium Chlorate and Antimony trisulphide
b) Potassium Chlorate
c) None of the options
d) Antimony trisulphide
Answer: Potassium Chlorate and Antimony trisulphide
Question: In the sun, heat and light are produced by
a) Nuclear reactions
b) Chemical reactions
c) Ionic reactions
d) None of the options
Answer: Nuclear reactions
Question: Which is a solid fuel
a) Wax
b) Wood
c) Diesel
d) Petrol
Answer: Wax
Question: Acid rain is caused by oxides of
a) Sulphur, Nitrogen
b) Sulphur, Carbon
c) Phosphorous, Carbon
d) Carbon, Nitrogen
Answer: Sulphur, Nitrogen
Question: Petrol engine gives off gaseous oxides of
a) Nitrogen
b) Sulphur
c) Phosphorous
d) Carbon
Answer: Nitrogen
Question: Burning of coal and diesel releases
a) SO2
b) CO
c) CO2
d) NO2
Answer: SO2
Question: Global warming is caused due to______concentration of Co2 in air
a) Increased
b) Decreased
c) Increased and Decreased
d) None of the options
Answer: Increased
Question: Combustion of most fuels releases
a) CO2
b) NO2
c) SO2
d) Oxygen
Answer: CO2
Question: Which of the following is/are carbon fuel
a) All of the options
b) Petroleum
c) Wood
d) Coal
Answer: All of the options
Question: Element showing spontaneous combustion is
a) Lithium
b) Phosphorous
c) Calcium
d) Copper
Answer: Lithium
Question: Amount of heat energy produced on _____combustion of 1kg of fuel is Calorific value
a) Complete
b) Half
c) None of the options
d) Incomplete
Answer: Complete
Question: Goldsmith uses ____part of the flame for melting gold
a) Outermost
b) Innermost and Middle
c) Innermost
d) Middle
Answer: Outermost
Question: Incomplete combustion gives
a) CO
b) Carbon
c) CO2
d) None of the options
Answer: CO
Question: Unburnt carbon particles causes
a) Respiratory problems
b) Stomach infections
c) Brain infections
d) Throat problems
Answer: Respiratory problems
Question: Calorific value is measured in
a) Kilo joule per Kg
b) Kilograms
c) Kilo joule
d) Kilometre
Answer: Kilo joule per Kg
Question: Calorific value gives the
a) Fuel efficiency
b) Amount of heat
c) Amount of light
d) None of the options
Answer: Fuel efficiency
Question: Ideal fuel has ____ calorific value
a) High
b) Moderate
c) Low
d) Zero
Answer: High
Question: The most common fire extinguisher is
a) Water
b) CO2
c) Oxygen
d) Hydrogen
Answer: Water
Question: During the process of combustion ________is given out
a) Both heat & light
b) Sound
c) Light
d) Heat
Answer: Both heat & light
Question: Use of______in vehicle reduces pollution
a) CNG
b) Diesel
c) None of the options
d) Petrol
Answer: CNG
Question: Which is better domestic fuel
a) LPG
b) CNG
c) Wood
d) Coal
Answer: LPG
Question: On burning fuel produces______amount of heat
a) Large
b) Less
c) Very less
d) No heat
Answer: Large
Question: Good fuel is
a) All of the options
b) Burn easily in air
c) Cheap
d) Readily available
Answer: All of the options
Question: Yellow colour in the flame denotes
a) Middle zone
b) Innermost zone
c) Outermost part
d) None of the options
Answer: Middle zone
Question: Innermost zone is the
a) Least hot part
b) Moderately hot part
c) Hottest part
d) Cold part
Answer: Least hot part
Question: Which is the hottest part in the flame of the candle
a) Blue
b) Yellow
c) Black
d) Wax part
Answer: Blue
Question: Substance which vaporise during Burning gives
a) Flame
b) Sound
c) Combustion
d) None of the options
Answer: Flame
Question: Explosion is the evolution of
a) All of the options
b) Heat
c) Sound
d) Light
Answer: All of the options
Question: Rapid combustion is
a) When gas burns, it produces heat and light
b) When there is evolution of heat
c) When material suddenly burst into flames
d) None of the options
Answer: When gas burns, it produces heat and light
Question: For combustion ________is necessary
a) Air
b) Paper
c) Water
d) Fuel
Answer: Air
Question: Fire extinguisher
a) Bring down the temperature of fuel and Cut off the supply of air
b) Bring down the temperature of fuel
c) Cut off the supply of air
d) None of the options
Answer: Bring down the temperature of fuel and Cut off the supply of air
Question: Essential requirements for producing fire are
a) All of the options
b) Heat
c) Fuel
d) Air
Answer: All of the options
Question: Which of the following is inflammable Substances?
a) Petrol
b) Wood
c) Paper
d) Straw
Answer: Petrol
Question: In the presence of water, ignition Temperature of paper is-
a) Decrease
b) Remain constant
c) Increase
d) None of the options
Answer: Decrease
Question: Which one of the following is non Combustible?
a) Stone piece
b) Straw
c) Matchsticks
d) Paper
Answer: Stone piece
Question: Which of the following has lower ignition temperature?
a) Kerosene oil
b) Vegetable oil
c) Wood
d) Paper
Answer: Kerosene oil
Question: The lowest temperature at which a Substance catches fire is called its-
a) Ignition temperature
b) Melting point
c) Critical temperature
d) Boiling point
Answer: Ignition temperature
Question: Which one of the following is combustible?
a) Paper
b) Stone pieces
c) Glass
d) Iron nail
Answer: Paper
Question: Combustion is a
a) Chemical process
b) Physical process
c) Chemical process and Physical process
d) None of the options
Answer: Chemical process
Question: Which one of the following is fuel of our body?
a) Food
b) Diesel
c) Petrol
d) Water
Answer: Food
Question: Fuel may be
a) All of the options
b) Gas
c) Liquid
d) Solid
Answer: All of the options
Question: Combustion is a reaction in which a Substance reacts with-
a) Oxygen
b) Chlorine
c) Nitrogen
d) Hydrogen
Answer: Oxygen
Question: Charcoal burns in air producing
a) CO2
b) CO
c) H2
d) O2
Answer: CO2
Question: When magnesium ribbon burnt it produce
a) Magnesium oxide
b) Magnesium hydroxide
c) Magnesium chloride
d) Magnesium sulphate
Answer: Magnesium oxide
Question: Which fuels are used for running automobiles
a) Diesel
b) Wood
c) Coal
d) Charcoal
Answer: Diesel
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MCQs for Chapter 6 Combustion and Flame Science Class 8
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