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
