Answer:
(a)
The places where fields of natural gas are found are Tripura, Jaisalmer,
Off-shore area of Bombay, Krishna-Godavari Delta. (1)
Natural
gas is a clean fuel because of the following reasons
(i)
It does not produce harmful gases on burning.
(ii)
It burns without smoke and does not leave any residue after burning.
(1 x 2)
(b)
There is so much emphasis on changing over from petrol /diesel driven
automobiles to CNG driven vehicles, because of the following reasons
(i)
CNG it does not produce smoke.
(ii)
CNG it does not leave unburnt hydrocarbons, lead particulates, etc which
pollute the environment. (2)
Or
(a)
(i) In windmill kinetic energy of wind is converted into electrical energy.
(1)
(ii)
15 km/h is the minimum wind velocity required to obtain energy.
(1)
(iii)
Wind does not blow at sufficiently high speed all the time. (1)
(b) Solar
energy is manifested in many forms on earth, one of which is hydro energy.
During water cycle, water flowing in rivers and other water bodies evaporates
by the heat of sun, condenses, moves back in upper atmospheric layers and gets
replenished back. Thus, energy of flowing water is attributed to the sun. (2)
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