Which of the following is a non-renewable source of energy?
Wood
Sun
Fossil fuels
Wind
Acid rain happens because
sun leads to heating of upper layer of atmosphere
burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
electrical charges are produced due to friction amongst clouds
earth atmosphere contains acids
Fuel used in thermal power plants is
water
uranium
biomass
fossil fuels
In a hydro power plant
Potential energy possessed by stored water is converted into electricity
Kinetic energy possessed by stored water is converted into potential energy
Electricity is extracted from water
Water is converted into steam to produce electricity
Which is the ultimate source of energy?
Water
Sun
Uranium
Fossil fuels
Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?
Nuclear energy
Thermal energy
Solar energy
Geothermal energy
Ocean thermal energy is due to
energy stored by waves in the ocean
temperature difference at different levels in the ocean
pressure difference at different levels in the ocean
tides arising out in the ocean
The major problem in harnessing nuclear energy is how to
split nuclei?
sustain the reaction?
dispose off spent fuel safely?
convert nuclear energy into electrical energy?
Which part of the solar cooker is responsible for green house effect?
Coating with black colour inside the box
Mirror
Glass sheet
Outer cover of the solar cooker
The main constituent of biogas is
methane
carbon dioxide
hydrogen
hydrogen sulphide
The power generated in a windmill
is more in rainy season since damp air would mean more air mass hitting the blades
depends on the height of the tower
depends on wind velocity
can be increased by planting tall trees close to the tower
Choose the correct statement
Sun can be taken as an inexhaustible source of energy
There is infinite storage of fossil fuel inside the earth
Hydro and wind energy plants are non polluting sources of energy
Waste from a nuclear power plant can be easily disposed off
In a hydroelectric power plant more electrical power can be generated if water falls 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
Choose the incorrect statement regarding wind power
It is expected to harness wind power to minimum in open space
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
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
Choose the incorrect statement
We are encouraged to plant more trees so as to ensure clean environment and also provide bio-mass fuel
Gobar-gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen
The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash
Bio-mass is a renewable source of energy