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Q4 Assertion and Reason: (1)Assertion: Fossil fuel such as coal, petroleum and natural gas are the main sources of energy. The reserves ofthese minerals are unlimited.Reason: The growing world population is consuming them in a judicious manner.(A) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.(B) The Assertion and the Reason are correct but the Reason is not the correct explanationof the Assertion.(C) The Assertion is true but the Reason is false.(D) The Assertion is false but the Reason is true.(E) Both the Assertion and the Reason are false.

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Q.2.   Does this list include air, water, soil and minerals?

Ans. Yes, this list contains, air, water, soil and minerals.

Q.3.   Can we use all our natural resources forever?

Ans. No, we cannot use all our natural resources forever, because these are going to exhaust one day.

Q.4.   Can air, water and soil he exhausted by human activities?

Ans. No, these can not be exhausted at all.

Q.5.   Is water a limit less source?

Ans. Yes, water is a limitless source, but by unwise use and cutting of trees, sources of water can be finished.

Q.6.   What are the advantages of using CNG and LPG as fuels?

Ans. The advantages of using CNG and LPG:

        (i) CNG and LPG are clean fuels.

        (ii) Their cost is low.

        (iii) They can he used directly for burning.

        (iv) They are easily available.

        (v) They do not produce pollution.

Q.7.   Name the petroleum product used for surfacing of roads.

Ans. Bitumen is the petroleum product which is used for surfacing of roads these days.

Q.8.   Describe how coal is formed from dead vegetation. What is this process called?

Ans. About 300 million years ago the earth had dense forest in low lying wetland areas. Due to various natural processes, like flooding and earthquakes, these forests got buried under the soil. The soil eposits layer by layer over them, they were compressed. Under high temperature and pressure the plants got converted to coal slowly. This process is called carbonisation.

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