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प्रश्न
Explain why is it no wise to regard wood as a renewable sources of energy.
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उत्तर
Use of wood is a renewable source but is not advised to use, because saplings take a long time to become a tree.
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.
Name any four fractions obtained from petroleum which are used as fuels.
Which of the following is not a fossil source of energy?
(a) kerosene oil
(b) cow-dung cakes
(c) CNG
(d) coal
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
Name the major component of biogas.
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
Which produced of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?
The source of energy of the sun is:
(a) conversion of hydrogen gas into helium
(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton
Name a few major producers of petroleum in the world.
Why should we conserve the non-renewable sources of energy?
