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The following Table shows the total power shortage in India from 1991-1997. Show the data in the form of a graph. Plot shortage percentage for the year on the Y-axis and the year on the X-axis.

1

Year 1991

Shortage %

7.9

2

1992

7.8

3

1993

8.3

. 4

1994

7.4

5

1995

7.1

6

1996

9.2

7

1997

11.5




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Kerosene is not a fossil fuel.


A. FALSE
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Explain why fossil fuels are exhaustible natural resources?


Fossil fuels are exhaustible natural resources because fossil fuels require millions of years to form from the dead vegetation and animal that get buried deep inside the earth. They require high temperature and pressure for their formation, which cannot be provided in the laboratory. It is present in limited quantity beneath the earth, thus it will come to an end by human usage.

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Describe characteristics and uses of coke.


Coke is obtained by burning of coal in absence of oxygen. The process is called destructive distillation.
Characteristics of coke:
i)Tough
ii)porous
iii) black in colour

USES:
Coke is used to manufacture steel.
Coke is used in the extraction of many metals.

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Explain the process of formation of petroleum.


Petroleum is a fossil fuel. It is formed beneath the earth by decomposition of the dead bodies of the living organisms buried beneath the earth.Millions of years ago, Due to some natural calamities like earthquake or volcano, innumerable living organisms (plants and animals) got burried beneath the earth. When they got buried deep in the soil, they were exposed to very high pressure and temperature.Hence, they started getting decomposed and got convertd into liquid and gas form. In this way petroleum oil and petroleum gas are formed.

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