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प्रश्न
Give an account of the use of solar energy.
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
State any four characteristics of a good source of energy.
What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
Name two sources of energy that you think are renewable. Give reason for your choice.
The fuel having the lowest calorific value is:
(a) coal
(b) wood
(c) charcoal
(d) kerosene
The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
The natural gas consists mainly of:
(a) methane
(b) ethane
(c) propane
(d) butane
The product of petroleum used to drive heavy vehicles like trucks is:
(a) petrol
(b) kerosene
(c) diesel
(d) carbon oxide
Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.
Name another element which is usually found in combination with X in fossil fuels.
Name the original source of wind energy.
Apart from cattle dung, what other substances can be added to a biogas plant?
Why is biogas considered an ideal fuel for domestic use?
Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
Name the major component of biogas.
The constituent of biogas which makes it an excellent fuel is:
(a) butane
(b) methane
(c) propane
(d) ethane
What type of nuclear reaction is responsible for the liberation of energy:
in the sun?
You have three unlabelled test tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal.
Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
Fill in the blank
__________ are examples of renewable energy resources.
Fill in the blank
_______is the coal with the highest percentage of coal.
