Last updated on December 9th, 2023 at 08:45 pm
MCQ on Class 8 Combustion and Flame
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1. What is combustion?
- A cooling process involving water and oxygen
- A chemical reaction releasing heat when combined with oxygen
- A process that involves the formation of ice crystals
- A mechanical reaction occurring in the absence of air
Answer: B) A chemical reaction releasing heat when combined with oxygen
2. What is another term for a combustible substance?
- Extinguisher
- Inflammable material
- Catalyst
- Fuel
Answer: D) Fuel
3. What is the minimum temperature required for a material to catch fire called?
- Combustion temperature
- Melting point
- Ignition temperature
- Flashpoint
Answer: C) Ignition temperature
4. What type of substances easily catch fire due to their low ignition temperature?
- Non-flammable
- Inflammable
- Inert
- Exothermic
Answer: B) Inflammable
5. Which element is necessary for combustion to occur?
- Carbon
- Hydrogen
- Air
- Nitrogen
Answer: C) Air
6. What is the most common fire extinguishing agent used for combustible materials like paper and wood?
- Carbon dioxide
- Sand
- Water
- Foam
Answer: C) Water
7. Which measure is suitable for extinguishing fires caused by oil and petrol?
- Fire brigade stations
- Water
- Carbon dioxide extinguisher
- Blankets
Answer: C) Carbon dioxide extinguisher
8. What term is used for a rapid, uncontrolled release of light, heat, and sound?
- Spontaneous combustion
- Explosion
- Flame
- Rapid combustion
Answer: B) Explosion
9. What is the amount of heat generated on the combustion of 1 kg of fuel called?
- Thermal mass
- Heat index
- Calorific value
- Ignition rate
Answer: C) Calorific value
10. Which environmental effects are caused by burning fuel?
- Enhanced air quality
- Reduced greenhouse gas emissions
- Global warming, acid rain, and release of carbon particles
- Improved soil fertility
Answer: C) Global warming, acid rain, and release of carbon particles
11. What is the primary purpose of a fuel?
- To create light
- To produce electricity
- To provide energy through combustion
- To act as a fire extinguisher
Answer: c) To provide energy through combustion
12. Which of the following is a gaseous fuel commonly used in vehicles?
- Kerosene
- Diesel
- LPG
- Charcoal
Answer: c) LPG
13. What is the lowest temperature at which a substance can catch fire called?
- Boiling point
- Melting point
- Ignition temperature
- Flashpoint
Answer: c) Ignition temperature
14. Which of the following substances is considered inflammable?
- Water
- Sand
- Petrol
- Wood
Answer: c) Petrol
15. What is the purpose of a fire extinguisher?
- To increase the temperature of a fire
- To provide oxygen to the fire
- To disrupt the contact between air and the fire
- To create a larger flame
Answer: c) To disrupt the contact between air and the fire
16. Why is water a good substance for firefighting?
- Because it increases the temperature of the fuel
- Because it covers the fire like a blanket
- Because it is a fuel itself
- Because it produces more oxygen
Answer: b) Because it covers the fire like a blanket
17. In which situation should you NOT use water to extinguish a fire?
- When clothes catch fire
- When electrical equipment is on fire
- When burning wood
- When using a gas stove
Answer: b) When electrical equipment is on fire
18. What is the best extinguisher for fires involving electrical equipment and inflammable materials like petrol?
- Water
- Sand
- Carbon dioxide
- Oxygen
Answer: c) Carbon dioxide
19. Which type of combustion involves a sudden reaction with the release of heat, light, sound, and a large amount of gas?
- Rapid combustion
- Spontaneous combustion
- Controlled combustion
- Explosion
Answer: d) Explosion
20. What factor affects the rate of combustion by a combustible substance?
- The presence of oxygen
- The color of the substance
- The shape of the flame
- The density of the air
Answer: a) The presence of oxygen
