MCQ on Class 8 Combustion and Flame

Last updated on December 9th, 2023 at 08:45 pm

MCQ on Class 8 Combustion and Flame

 

Are you searching for MCQ on Class 8 Combustion and Flame then you are on the right place.

 

1. What is combustion?

  1. A cooling process involving water and oxygen
  2. A chemical reaction releasing heat when combined with oxygen
  3. A process that involves the formation of ice crystals
  4. 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?

  1. Extinguisher
  2. Inflammable material
  3. Catalyst
  4. Fuel

Answer: D) Fuel

 

3. What is the minimum temperature required for a material to catch fire called?

  1. Combustion temperature
  2. Melting point
  3. Ignition temperature
  4. Flashpoint

Answer: C) Ignition temperature

 

4. What type of substances easily catch fire due to their low ignition temperature?

  1. Non-flammable
  2. Inflammable
  3. Inert
  4. Exothermic

Answer: B) Inflammable

 

5. Which element is necessary for combustion to occur?

  1. Carbon
  2. Hydrogen
  3. Air
  4. Nitrogen

Answer: C) Air

 

6. What is the most common fire extinguishing agent used for combustible materials like paper and wood?

  1. Carbon dioxide
  2. Sand
  3. Water
  4. Foam

Answer: C) Water

 

7. Which measure is suitable for extinguishing fires caused by oil and petrol?

  1. Fire brigade stations
  2. Water
  3. Carbon dioxide extinguisher
  4. Blankets

Answer: C) Carbon dioxide extinguisher

 

8. What term is used for a rapid, uncontrolled release of light, heat, and sound?

  1. Spontaneous combustion
  2. Explosion
  3. Flame
  4. Rapid combustion

Answer: B) Explosion

 

9. What is the amount of heat generated on the combustion of 1 kg of fuel called?

  1. Thermal mass
  2. Heat index
  3. Calorific value
  4. Ignition rate

Answer: C) Calorific value

 

10. Which environmental effects are caused by burning fuel?

  1. Enhanced air quality
  2. Reduced greenhouse gas emissions
  3. Global warming, acid rain, and release of carbon particles
  4. Improved soil fertility

Answer: C) Global warming, acid rain, and release of carbon particles

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