NCERT MCQ Solutions for Class 8 Science Chapter 4 Combustion and Flame Updated for Session 2025-26. It gives well-structured and accurate answers to multiple-choice questions based on key topics like types of combustion, ignition temperature, flame zones, fuel efficiency and fire control methods. These MCQs are essential for quick revision and exam preparation. Designed as per the latest syllabus, the solutions help students strengthen their conceptual understanding and perform confidently in objective-type assessments.
Class 8 Science Chapter 4 Solution
Class 8 Science MCQ
Class 8 All Subjects MCQ
Class 8 Science Chapter 4 MCQ Online Test
Q1. What is the chemical process in which a substance reacts with oxygen to give off heat called?
[A]. Combustion
[B]. Condensation
[C]. Sublimation
[D]. Vaporisation
Q2. Which of the following is essential for combustion to occur?
[A]. Carbon dioxide
[B]. Oxygen
[C]. Hydrogen
[D]. Nitrogen
Q3. What is the lowest temperature at which a substance catches fire called?
[A]. Melting point
[B]. Ignition temperature
[C]. Freezing point
[D]. Boiling point
Q4. Which of the following is an example of an inflammable substance?
[A]. Petrol
[B]. Water
[C]. Stone
[D]. Iron
Class 8 Science Chapter 4 Quiz
Q5. What is the primary reason for using CO2 as a fire extinguisher for electrical fires?
[A]. It does not conduct electricity
[B]. It is cheaper than water
[C]. It is easily available
[D]. It is lighter than oxygen
Q6. Which zone of a candle flame is the hottest?
[A]. Dark zone
[B]. Middle zone
[C]. Outermost zone
[D]. Innermost zone
Q7. What is the term for the sudden reaction that produces heat, light, and sound, often seen in fireworks?
[A]. Rapid combustion
[B]. Explosion
[C]. Slow combustion
[D]. Spontaneous combustion
Q8. Which of the following fuels has the highest calorific value?
[A]. Wood
[B]. Hydrogen
[C]. Coal
[D]. Cow dung cake
Class 8 Science Chapter 4 MCQ Explanation
Q9. Why is water not suitable for extinguishing oil fires?
[A]. It sinks below the oil
[B]. It evaporates quickly
[C]. It is too expensive
[D]. It reacts with oil
Q10. What harmful gas is produced by incomplete combustion of fuels?
[A]. Carbon monoxide
[B]. Nitrogen
[C]. Hydrogen
[D]. Oxygen
Q11. Which of the following is a characteristic of an ideal fuel?
[A]. Low calorific value
[B]. Readily available
[C]. Produces harmful residues
[D]. High cost
Q12. What is the main environmental concern associated with increased CO2 levels from burning fuels?
[A]. Global warming
[B]. Ozone depletion
[C]. Soil erosion
[D]. Acid rain
Class 8 Science Chapter 4 Quiz Questions
Q13. Which of the following is used by goldsmiths to melt metals due to its high temperature?
[A]. Middle zone of flame
[B]. Outermost zone of flame
[C]. Dark zone of flame
[D]. Innermost zone of flame
Q14. What is the primary cause of acid rain?
[A]. Sulphur dioxide and nitrogen oxides
[B]. Oxygen
[C]. Hydrogen
[D]. Carbon dioxide
Q15. Which of the following is NOT a requirement for combustion?
[A]. Oxygen
[B]. Water
[C]. Heat
[D]. Fuel
Q16. What is the term for the type of combustion where a material bursts into flames without an apparent cause?
[A]. Explosion
[B]. Spontaneous combustion
[C]. Slow combustion
[D]. Rapid combustion
Class 8 Science Chapter 4 MCQs
Q17. Which fuel is considered a cleaner alternative for automobiles?
[A]. Petrol
[B]. CNG
[C]. Coal
[D]. Diesel
Q18. What is the unit for expressing the calorific value of a fuel?
[A]. m³/kJ
[B]. kJ/m³
[C]. kg/kJ
[D]. kJ/kg
Q19. Why does a paper cup with water not burn when heated?
[A]. Paper becomes fireproof
[B]. The ignition temperature of paper is not reached
[C]. Water extinguishes the flame
[D]. Water absorbs all the heat
Q20. What is the main harmful effect of unburnt carbon particles released by fuels?
[A]. Respiratory diseases
[B]. Soil pollution
[C]. Water pollution
[D]. Global warming
