CBSE Class 8 Science - Combustion and Fuels (1)
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Q.1. Answer the following questions in 30- 40 words:
a-What is meant by luminous and nonluminous flames?
b-Name two damaging effects of burning of coal and petroleum.
c-Mention any two characteristics that you would consider for selecting the most ideal fuel.
d-What is acid rain?How does it affect the iron structures?
Q.2. Answer the following questions in 80- 100 words:
a-What is a combustible substance?Give suitable examples.
b-Draw a labelled diagram showing four zones of a candle flame.
c-An electric spark is passed between two electrodes placed near each other inside a tightly closed tin can
full of petrol/diesel, will the petrol/diesel catch fire? Give reason in support of your answer.
d-How are fuels classified ? Give two examples of each class.
e-Name the various pollutants produced by the combustion of fossil fuels . Also mention their harmful
Q.3. Define the following terms
e-Characteristics of an Ideal fuel
Q.4.Write one word for the following
a-The process in which a substance combines with oxygen producing heat and light.
b-The combination reaction that takes place in the presence of insufficient air of another substance.
Q.5.Match the following:
a- combustible substance i-Fire fighting
b-Carbon dioxide ii-Fuels
c-Hydrocarbons iii-Complete combustion
d-Hottest part of the candle flame iv-Kilo joule per gram
e-Calorific value v-Paper
Q.6. Choose the correct answer:
a-Which of the following has the lowest ignition temperature?
i-Petrol ii-Kerosene iii-coal iv-LPG
b-The substance having the highest calorific value is
i-LPG ii-Hydrogen iii-Oxygen iv-coal gas
c-Which of the following gives a pollution free environment when burnt
i-Dung cake ii-Kerosene iii-Wood iv-Biogas
d-What is produced during combustion of substance
i-Light ii-Heat iii-Both heat and light iv-None of the above
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