Sources of energy Worksheet-7
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What are fossil fuels?
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Who discovered the first nuclear reaction and when?
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Which is most abundant isotope of uranium?
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Name one practical application of nuclear fission.
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What is the source of energy in nuclear fission and fusion?
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What is the drawback of energy obtained from fusion ?
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What is a source of energy? What are its essential characteristics?
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What is the composition of solar energy?
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What is the cause of ocean thermal energy?
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What are the advantages of coke over coal?
Answer:
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The fuels obtained from fossils are called fossils fuels like coal, petroleum, natural gas etc.
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Rutherford, in the year 1919.
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Uranium-238.
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Nuclear reactor for generation of electric power.
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The disappearance of certain mass (Δm) in both the processes, fission and fusion. It appears as energy.
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It cannot be controlled.
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A system which is capable of providing adequate amount of useful energy is known as a source of energy. The essential characteristics of a source of energy are :
(i) convenient to use (ii) easy to transport and (iii) easy to store.
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Solar energy consists of electromagnetic waves (infrared radiation, visible radiation, ultraviolet radiation, X - rays, γ - rays, etc.) and cosmic rays.
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There is a difference of temperature between water at the surface of ocean and at deeper level. Ocean thermal energy is due to this temperature difference.
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(i) Coke produces more heat than an equal mass of coal.
(ii) It produces no smoke on burning and leaves no residue so it does not cause air pollution.
(iii) It is used as a reducing agent in the extraction of metals from their ores.
