Advertisements
Advertisements
Question
Give an account of the use of solar energy.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Why are we looking at alternate sources of energy?
Name two sources of energy that you think are renewable. Give reason for your choice.
What is the composition of liquefied petroleum gas (LPG)?
The product of petroleum used to drive heavy vehicles like trucks is:
(a) petrol
(b) kerosene
(c) diesel
(d) carbon oxide
Coal cannot be converted into one of the following forms of energy. This is:
(a) coal gas
(b) electricity
(c) oil
(d) charcoal
Name the clean fuel which can be obtained from cow-dung.
Fill in the following blank with suitable word:
Tidal waves build up and recede ........... a day.
Most of the sources of energy that we sue represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?
(a) wind energy
(b) geothermal energy
(c) fossil fuels
(d) biomass
The non-renewable source of energy among the following is:
(a) hydroelectricity
(b) sewage gas
(c) natural gas
(d) gobar gas
When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D
What do you know about wind energy?
Why are fossil fuels called non-renewable sources of energy?
Which among the following is the non-renewable resources?
Write about Renewable resources.
Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?
Exhaustible natural resources are
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible? If yes, why? If not, why not?
Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
Complete the crossword in figure with the help of the clues:
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
