CBSE Class 8 Science Combustion and Fuels Assignment Set A

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

effects.

Q.3. Define the following terms

a-Ignition Temperature

b-Complete Combustion

c-Luminous flame

d-Fuels

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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