NCERT Exemplar VII — task. Science CBSE, Class 10.

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Select the correct answer:

1. In a hydroelectric power plant, more electrical power can be generated if waterfalls from a greater height because

its temperature increases
larger amount of potential energy is converted into kinetic energy
the electricity content of water increases with height
more water molecules dissociate into ions

2. Choose the incorrect statement regarding wind power

It is expected to harness wind power to minimum in open space
One possible method of utilising the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator
The potential energy content of wind blowing at high altitudes is the source of wind power
Wind hitting at the blades of a windmill causes them to rotate The rotation thus achieved can be utilised further

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