CBSE Class 10 Science Sources of Energy Quiz 2

1. The power generated in a windmill

A is more in rainy season since damp air would mean more air mass hitting the blades B depends on the height of the tower C depends on wind velocity D can be increased by planting tall trees close to the tower

2. Choose the correct statement.

A Sun is considered as an inexhaustible source of energy B There is infinite storage of fossil fuel inside the Earth C Hydro and wind energy plants are non polluting sources of energy D Waste from a nuclear power plant can be easily disposed off

3. In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because

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

4. Choose the incorrect statement regarding wind power.

A It is expected to harness wind power to minimum in open space. B The potential energy content of wind blowing at high altitudes is the source of wind power. C Wind hitting the blades of a windmill causes them to rotate. The rotation thus achieved can be utilised further. D 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.

5. Choose the incorrect statement.

A We are encouraged to plant more trees so as to ensure clean environment and also provide biomass fuel. B Gobar gas is produced when crops, vegetable wastes, etc. , decompose in the absence of oxygen. C The main ingredient of biogas is ethane and it gives a lot of smoke and also produces a lot of residual ash. D Biomass is a renewable source of energy.