MCQ questions for class 8 Science Chapter 6 Combustion and Flame
Question 1: What is the term for the process of burning in which a substance reacts rapidly with oxygen and releases energy?
Fermentation
Photosynthesis
Combustion
Decomposition
Question 2: Which of the following is a product of combustion?
Oxygen
Carbon dioxide
Nitrogen
Water vapor
Question 3: What is the term for a substance that can catch fire easily and burns rapidly?
Combustible
Non-combustible
Inflammable
Explosive
Question 4: Which of the following is a characteristic of a flame?
Cold
Dark
Bright
Solid
Question 5: What is the term for the minimum temperature at which a substance catches fire and burns?
Flame temperature
Ignition temperature
Combustion temperature
Flash point
Question 6: Which of the following is a non-combustible substance?
Wood
Paper
Cotton
Brick
Question 7: What is the term for the process of breaking down a substance into simpler substances by the action of heat?
Combustion
Distillation
Decomposition
Fermentation
Question 8: Which of the following is a product of incomplete combustion?
Carbon dioxide
Carbon monoxide
Nitrogen
Water vapor
Question 9: What is the term for the luminous zone of a flame?
Inner core
Outer core
Mantle
Wick
Question 10: Which of the following is a fuel?
Salt
Copper
Charcoal
Glass
Question 11: What is the term for the process of burning a substance in the presence of oxygen?
Combustion
Respiration
Fermentation
Photosynthesis
Question 12: Which of the following is a product of complete combustion?
Carbon dioxide
Carbon monoxide
Nitrogen
Water vapor
Question 13: What is the term for the ignition temperature of a substance in the presence of oxygen?
Auto-ignition temperature
Flash point
Kindling temperature
Ignition point
Question 14: Which of the following is a flameless source of light obtained from the combustion of hydrogen gas?
Candle flame
Lantern flame
Electric bulb
Hydrogen flame
Question 15: What is the term for the substance that undergoes combustion?
Igniter
Kindler
Fuel
Extinguisher
Question 16: Which of the following is a safety measure to prevent fires?
Using more inflammable materials
Keeping electrical appliances on
Leaving candles unattended
Keeping a fire extinguisher
Question 17: What is the term for the process of extinguishing a fire by removing the fuel or reducing the temperature?
Combustion
Ignition
Extinguishment
Incineration
Question 18: Which of the following is a fire safety device that contains chemicals that can be sprayed on a fire to extinguish it?
Fire blanket
Fire hydrant
Fire extinguisher
Fire alarm
Question 19: What is the term for a substance that slows down or prevents the combustion of another substance?
Kindler
Fuel
Igniter
Inhibitor
Question 20: What is the term for the process of burning a substance without the presence of oxygen?
Combustion
Respiration
Fermentation
Anaerobic combustion
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