Q5 of 17 Page 93

Name the petroleum products used for roads surfacing.

Coal tar is mainly used for road surfacing.


The black thick liquid which one might have seen where roads are being laid is the coal tar. It is a mixture of about 200 different petroleum substances and increases life span of roads.


More from this chapter

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3

Tick (√ ) the only correct choice among the following.

i. Which one of the following is less polluting fuel?


a. Natural gas b. coal


c. kerosene d. petrol


ii. The main constituent of coal is


a. Carbon. b. oxygen


c. air d. water


iii. Which one of the following material is used for making shoe polish?


a. Paraffin wax b. petrol.


c. diesel d. lubricating oil

 4

Fill in the blanks.

i. ___________ was used in manufacture of steel.


ii. The biproduct of coal used in synthetic dyes and paints is ____________.


iii. Coal was formed in areas where large amounts of ______________was buried under


the earth.


iv. __________gas which causes climate change and global warming.

 6

Explain the process of formation of petroleum on Earth?

 7

Project Work

Compare a CNG run vehicle with that of a diesel run vehicle. What difference do you notice in both cases with respect to pollutants released, level of pollution and cost of fuel? Prepare a report on your findings. You can take the help of a driver to make a report on your observation.