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Question 1

What are the advantages of using CNG and LPG as fuels?

The advantages of using CNG and LPG as fuel are:

i. a non – polluting fuel for vehicles

ii. it is used for power generation

iii. it can be used directly for burning in homes and factories

Question 2

Name the petroleum product used for surfacing of roads.

A petroleum product ‘bitumen’ is used for surfacing of roads.


Question 3

Describe how coal is formed from dead vegetation. What is this process called ?

About 300 million years ago the earth had dense forests in low lying wetland areas. Due to natural processes, like flooding these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonization.


Question 6

Explain why fossil fuels are exhaustible natural resources.

Fossil fuels are limited in nature, and is used by human activities so called as exhaustible natural resources.


Question 7

Describe characteristics and uses of coke.

It is a tough, porous and black substances. It is almost pure form of carbon. ‘coke is obtained by heating soft coal in the absence or’ little supply of air. It is used in the manufacture of steel and in the extraction of many metals.


Question 8

Explain the process of formation of petroleum.

Petroleum occurs deep down in the earth between layers of non-porous rocks. Crude oil petroleum is formed by the decomposition of animal and plant remains over millions of years inside the earth. Natural gas occurs above the petroleum oil trapped under the rocks.


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