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प्रश्न
Give an account of the use of solar energy.
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उत्तर
Solar energy is the energy that we receive from the sun. It is readily available in nature and in unlimited quantities.
While there are several ways to obtain solar energy, one way is by the use of solar cells or photovoltaic panels. These panels are made from very thin semiconducting materials which, when exposed to sunlight, use the heat and light of the sun to shake the electrons loose and create an electric current.
Solar cells are used for lighting street lamps, electronic calculators, watches, smartphones, cameras, traffic signals, water pumps, and home lighting. Solar energy is being used to heat ovens, cook food, and heat water.
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संबंधित प्रश्न
Fill in the following blank with a suitable word:
The amount of heat produce by burning a unit mass of a fuel completely is known as its ............ value.
Why are fossil fuels classified as non-renewable source of energy?
A good fuel is one which possesses:
(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition temperature
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
Name the substance X.
The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.
Name the device
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(a) cow-dung
(b) water
(c) oxygen
(d) anaerobic bacteria
The gravitational pull of the moon cause the sea-water to rise periodically.
(a) What name is given to the condition of the sea when water to rise periodically.
(b) What name is given to the condition of the sea when its raised water recedes?
(c) What name is given to the energy which can be harnessed from this natural phenomenon?
(d) Draw labelled diagram to show how this energy can be harnessed from this natural
What type of nuclear reaction is responsible for the liberation of energy:
in the sun?
The fossil fuel whose known reserves in the earth are expected to last for the minimum period is:
(a) coal
(b) uranium
(c) petroleum
(d) natural gas
Name five renewable and three non-renewable sources of energy.
Fill in the blank
__________ are examples of renewable energy resources.
Fill in the blank
Coal, petroleum, and natural gas are _________fuels.
State whether the following is True or False.
Coal and petroleum are renewable energy resources.
Why should we conserve the non-renewable sources of energy?
Why are fossil fuels called non-renewable sources of energy?
Write about Renewable resources.
Why is there a need to harness non-conventional sources of energy? Give two main reasons.
Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
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