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MCQ Questions for Class 8 Science with Answers
Q1. The zone of a flame used by goldsmith for melting gold and silver is:
(i) innermost zone
(ii) middle zone
(iii) outermost zone
(iv) all of these
(iii) outermost zone
Q2. Magnesium burns to form
(i) calcium carbonate
(ii) magnesium oxide
(iii) calcium oxide
(iv) magnesium sulphate
(ii) magnesium oxide
Q3. Which of the following has the characteristics of a good fuel?
(i) Coke
(ii) Butane
(iii) Coal
(iv) Kerosene
(ii) Butane
Q4. The burning of LPG is an example of
(i) rapid combustion
(ii) spontaneous combustion
(iii) slow combustion
(iv) explosion
(i) rapid combustion
Q5. Fuel may be
(i) Solid only
(ii) Solid,Liquid or gas
(iii) Liquid only
(iv) Gas only
(ii) Solid,Liquid or gas
Q6. What does the blue zone in an L.P.G. flame indicate?
(i) Unburnt vapours
(ii) Partial decomposition
(iii) Moderately hot
(iv) Hottest zone of complete combustion
(iv) Hottest zone of complete combustion
Q7. Is heat and light produced by Sun a combustion process?
(i) yes
(ii) no
(iii) can’t say
(iv) none of these
(ii) no
Q8. Name the chemical process in which a substance reacts with oxygen to give out heat.
(i) Reaction
(ii) Junction
(iii) Combustion
(iv) All of these
(iii) Combustion
Q9. The substances which give heat and light after combustion are called
(i) flame
(ii) fuel
(iii) combustion
(iv) none of these
(ii) fuel
Q10. Which is non-renewable source of energy’?
(i) Natural gas
(ii) Wind energy
(iii) Tidal energy
(iv) Mechanical energy
(i) Natural gas
Q11. The substances which have very low ignition temperature and can easily catch fire with a flame are called
(i) Inflammable substances
(ii) Flaming substance
(iii) Fire proof substance
(iv) None of the above
(i) Inflammable substances
Q12. What is burning of a substance in the presence of air with the evolution of heat called?
(i) Distillation
(ii) Carbonization
(iii) Combustion
(iv) Refining
(iii) Combustion
Q13. Ignition temperature is the:
(i) temperature at which a substance catches fire
(ii) highest temperature at which a substance catches fire
(iii) lowest temperature at which a substance catches fire
(iv) none of these
(iii) lowest temperature at which a substance catches fire
Q14. Combustible substances are also known as
(i) inflammable
(ii) flaming
(iii) illuminous
(iv) non-flammable
(i) inflammable
Q15. What kind of reaction is combustion?
(i) Reduction
(ii) Redox
(iii) Substitution
(iv) Oxidation
(iv) Oxidation
Q16. Which gas helps in the process of combustion?
(i) Cooking gas
(ii) Nitrogen gas
(iii) Oxygen gas
(iv) Producer gas
(iii) Oxygen gas
Q17. When oil or petrol catches fire, water is not used to extinguish it because
(i) Water covers oil and oil burns under water layer which may not be noticeable
(ii) Water is heavier than oil / petrol and so remains below the oil layer which continues to burn
(iii) Water get mixed with oil and increases fire
(iv) Water gets evaporated
(ii) Water is heavier than oil / petrol and so remains below the oil layer which continues to burn
Q18. Which of the following is an example of rapid combustion?
(i) Candle
(ii) Cracker
(iii) White phosphorus
(iv) Sulphur
(i) Candle
Q19. A mgtchstjck does not catch fire on its own at room temperature because its:
(i) ignition temperature is more than room temperature
(ii) ignition temperature is less than room temperature
(iii) ignition temperature is same as room temperature
(iv) none of these
(i) ignition temperature is more than room temperature
Q20. In the sun, light and heat are produced by
(i) chemical reactions
(ii) nuclear reactions
(iii) burning reactions
(iv) bunsen burner
(ii) nuclear reactions
Q21. If a glass plate/slide is held into the luminous part of candle flame we see a circular blackish ring that represents:
(i) unburnt carbon particles
(ii) formation of coal
(iii) burnt carbon particles
(iv) Both burnt carbon particles & formation of coal
(i) unburnt carbon particles
Q22. Which zone represents the partial combustion in candle flame?
(i) Outer zone
(ii) Middle zone
(iii) Inner zone
(iv) Lower zone
(ii) Middle zone
Q23. A person caught fire on clothes is wrapped with blanket because
(i) The person suddenly feels cold
(ii) To hide the burnt body parts
(iii) The person’s clothes gets burnt
(iv) To reduce air supply and put fire off
(iv) To reduce air supply and put fire off
Q24. What does natural gas contain?
(i) Methane, ethane, propane.
(ii) Butane, propane and ethane.
(iii) Pentene, methane and ethylene.
(iv) Hexane, butane and ethane.
(i) Methane, ethane, propane.
Q25. Combustion that takes place at a very fast rate is called:
(i) rapid combustion
(ii) spontaneous combustion
(iii) explosion
(iv) none of these
(i) rapid combustion
Q26. Long, long ago, which of the following trees was used to produce matchsticks?
(i) Mango
(ii) Deodar
(iii) Banyan
(iv) Pine
(iv) Pine
Q27. Burning of charcoal in a closed room will produce
(i) carbon dioxide
(ii) nitrogen dioxide
(iii) carbon monoxide
(iv) all of these
(iii) carbon monoxide
Q28. Substances which catch fire are called
(i) acids
(ii) bases
(iii) combustible
(iv) burners
(iii) combustible
Q29. Explosion takes place because of
(i) Release of large amount of gas under pressure due to sudden reaction
(ii) Release of large amount of heat
(iii) Release of large amount of light
(iv) None of the above
(i) Release of large amount of gas under pressure due to sudden reaction
Q30. The substances which have very low ignition temperature will
(i) catch fire easily
(ii) will not catch fire
(iii) catch fire after some time
(iv) none of the above
(i) catch fire easily
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