Intext Q No.s page no. 253 Chapter 14: Sources of Energy Science Class 10 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. What kind of mirror concave, What are the limitations of the energy, What is geothermal energy, What are the advantages of nuclear energy is solved by our expert teachers. You can get ncert solutions and notes for class 10 chapter 14 absolutely free. NCERT Solutions for class 10 Science Chapter 14: Sources of Energy is very essencial for getting good marks in CBSE Board examinations
Intext Q No.s page no. 253
Q No. 1: What kind of mirror − concave, convex or plain − would be best suited for use in a solar cooker? Why?
Ans: A concave mirror would be best suited for use in a solar cooker because it reflect and focus the sunlight at a point. The temperature at that point increases which heats and cooks the food placed at that point.
Q No. 2: What are the limitations of the energy that can be obtained from the oceans?
Ans: Tidal energy, wave energy, and ocean thermal energy are various forms of energy that can be obtained from the sun. But there are several limitations to harness these energies. Those limitations are
(i) High dams are required to be built to convert tidal energy into electricity which incurs lot of cost.
(ii) Very strong waves are required, which are not possible all the time.
(iii) Tidal energy depends on the relative positioning of the Earth, moon, and the Sun.
(iv) To harness ocean thermal energy the difference in the temperature of surface hot water and the cold water at depth must be 20ºC or more.
Q No. 3: What is geothermal energy?
Ans: Geothermal energy is generated at the geothermal power plants where the heat of earth is used to generate electricity.
Due to some geological changes, the molten rocks present in the core of the earth are pushed to the earth’s crust. Steam is generated when the underground water comes in contact with these points forming hot springs. This trapped steam is used to generate electricity in the geothermal power plants.
Q No. 4: What are the advantages of nuclear energy?
Ans: The advantages of nuclear energy are as follows:
(a) Large amount of energy is produced per unit mass.
(b) Fission of one atom of uranium produces ten million times the energy released by burning of one atom of carbon.
(c) It does not produce smoke. It is a clean energy.
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