Question

Another traditional source of energy was the kinetic energy of flowing water or the potential energy of water at a
height. Hydro power plants convert the potential energy of falling water into electricity. Since there are very few
water falls which could be used as a source of potential energy, hydro power plants are associated with dams. In the
last century, a large number of dams were built all over the world. We know that, a quarter of our energy
requirement in India is met by hydropower plants. In order to produce hydel electricity, high rise dams are
constructed on the river to obstruct the flow of water and thereby collect water in large reservoirs. the water level
rise and in this process the kinetic energy of flowing water gets transformed into potential energy. The water from
the high level in the dam is carried through pipes, to the turbine, at the bottom of the dam. Since the water in the
reservoir would be refilled each time it rains ( hydropower is a renewable source of energy ) we would not have to
worry about hydraulic City sources getting used up the fossil fuels would get finished one day. But, constructions of
big dams have certain problems associated with it. The dams can be constructed only in a limited number of places,
preferably in hilly terrains. Large areas of agricultural land and human habitation are to be sacrificed as they get
submerged under the water in dams. The vegetation which is submerged rots under anaerobic conditions and gives
rise to large amounts of methane which is also a greenhouse gas.
(i) Name one traditional source of energy.
(a) flowing water (b) natural gas
(c) atomic power
(d) none of these
(ii) What part of the total energy in India comes from hydropower plants ?
(a) one third
(b) one quarter (c) one fourth
(d) none of these
(iii) What type of energy is hydro energy?
(a) Non renewable (b) Renewable (c) both renewable and non-renewable (d) None of these
(iv) One disadvantage of building dams is
(a) It produce clean power
(b) it is a renewable source of energy
(c) large areas of agricultural land and human habitation are to be sacrificed as they get submerged
(d) Can-store large amount of water​

Answer 1

Answer:

i) ans= Flowing water (a) no.is the correct answer

ii) ans= one quarter (b) no. ia the correct answer

iii) ans= Renewable source (b) no.is the correct answer

iv) ans= Large areas of agricultaral land and human habitation are to be sacrificed as they get submerged (c) no. is the correct answer

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