{"id":6898,"date":"2024-01-26T08:14:54","date_gmt":"2024-01-26T08:14:54","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=6898"},"modified":"2024-01-26T08:15:06","modified_gmt":"2024-01-26T08:15:06","slug":"ncert-solutions-class-10-science-chapter-14-sources-of-energy","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-10-science-chapter-14-sources-of-energy\/","title":{"rendered":"NCERT Solutions Class 10 (Science) Chapter 14 (Sources of Energy)"},"content":{"rendered":"<h2 style=\"text-align: center;\"><strong><span style=\"color: #000000; font-family: georgia, palatino, serif;\">NCERT Solutions Class 10 Science\u00a0<\/span><\/strong><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">The NCERT Solutions in English Language for Class 10 Science <strong>Chapter &#8211; 14 (Sources of Energy) <\/strong>has been provided here to help the students in solving the questions from this exercise.\u00a0<\/span><\/p>\n<h2 style=\"text-align: center;\"><strong><span style=\"color: #000000; font-family: georgia, palatino, serif;\">Chapter &#8211; 14 (Sources of Energy)\u00a0<\/span><\/strong><\/h2>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Questions<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. <span style=\"text-align: justify;\">What is good source of energy ?<br \/>\n<\/span><\/strong><strong style=\"text-align: justify;\">Answer &#8211; <\/strong><span style=\"text-align: justify;\">A substance which produces sufficient amount of energy over a long period of time without producing much smoke is known as good source of energy.\u00a0Characteristics of a good source of energy.<\/span><\/span><\/p>\n<div id=\"content-wrap\" class=\"container clr\" style=\"text-align: justify;\">\n<div id=\"primary\" class=\"content-area clr\">\n<div id=\"content\" class=\"site-content clr\">\n<article id=\"post-7981\">\n<div class=\"entry-content clr\">\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. What is good fuel ?<br \/>\n<\/strong><strong>Answer &#8211; <\/strong>A fuel which provides large amount of heat energy without causing pollution.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. If you could use any source of energy for heating your food, which one would you use and why ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>We would use microwave oven for heating our food. This is because the nutritional value of food is not lost when heated in a microwave oven.<\/span><\/p>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Questions<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. What are the disadvantages of fossil fuels ?\u00a0<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>There are following disadvantage of fossil fuels:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Burning of fossil fuels causes\u2019 pollution.<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Oxides of Sulphur and nitrogen produced on burning of fossil fuel causes acid rain.<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Carbon dioxide causes greenhouse effect.<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">Fossil fuels are non-renewable sources of energy.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. Why are we looking at alternate sources of energy ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong><\/span><span style=\"color: #000000;\">Because the conventional sources of energy may completely be exhausted one day if their use at the present rate continues.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">3. <\/span><span style=\"color: #000000;\">How has the traditional use of wind energy and water been modified for our convenience<br \/>\n<\/span><\/strong><span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Traditional use of wind and water energy have been modified in the following ways: <\/span><\/p>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Wind energy :<\/strong> Through windmill-Windmill can be used for running water pump, grinding grains and generating electricity. <\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Water energy :<\/strong> Through the use of hydro energy, by constructing dams and setting up hydroelectric power stations.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Questions<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. What kind of mirror\u2014concave, convex or plane would be best suited for the use in a solar cooker. Why ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Concave mirror, because it focusses the sun rays at a point to raise the temperature at that point.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. What are the limitations of the energy that can be obtained from oceans ?<br \/>\n<\/strong><strong>Answer &#8211;\u00a0<\/strong>The energy obtained from the oceans is :<br \/>\n<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"color: #000000;\">Energy from oceans is available only when high tides are in the ocean.<\/span><\/li>\n<li><span style=\"color: #000000;\">Power plants used to convert ocean energy into electric energy do not operate continuously.<\/span><\/li>\n<li><span style=\"color: #000000;\">Energy of ocean waves can be extracted blow all times across the ocean.<\/span><\/li>\n<li><span style=\"color: #000000;\">Tidal power plants can not be installed everywhere.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. What is geothermal energy ?\u00a0<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>The heat energy stored in the hot spots of the earth\u2019s crust is called geothermal energy.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4. What are the advantages of nuclear energy ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Some advantages of nuclear energy are: <\/span><\/p>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">A small quantity of nuclear fuel gives a large amount of energy.<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"color: #000000;\">In a nuclear power plant, the nuclear fuel is inserted once to get energy over a longer period of time.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Questions<\/strong><\/span><\/p>\n<p><strong><span style=\"color: #000000;\">1. <\/span><span style=\"color: #000000;\">Can any source of energy be pollution free ? Why or why not ?<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong><\/span><span style=\"color: #000000;\">No source of energy is there which is pollution free. However, some sources of energy cause more pollution and some sources of energy cause less pollution.<\/span><\/p>\n<p><strong><span style=\"color: #000000;\">2. <\/span><span style=\"color: #000000;\">Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not ?<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Hydrogen is a cleaner fuel than CNG. This is due to the reason that it produces water on burning whereas CNG on burning produces CO<sub>2<\/sub>, though much less than that produced when coal or oil is burnt. The increase in concentration of CO<sub>2<\/sub> in the atmosphere increases the temperature of atmosphere.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Questions<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. Name two energy sources that you would consider to be renewable. Give reasons for your choices.<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>Two renewable sources of energy are as follows:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"text-align: justify;\">\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Sun :<\/strong> The energy derived from the Sun is known as solar energy. Solar energy is produced by the fusion of hydrogen into helium, fusion of helium into other heavy elements, and so on. A large amount of hydrogen and helium is present in the Sun. Therefore, solar energy can replenish on its own. The Sun has 5 billion years more to burn. Hence, solar energy is a renewable source of energy.<\/span><\/p>\n<\/li>\n<li>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>Wind :<\/strong> Wind energy is derived from air blowing with high speed. Wind energy is harnessed by windmills in order to generate electricity. Air blows because of uneven heating of the Earth. Since the heating of the Earth will continue forever, wind energy will also be available forever.<\/span><\/p>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">2. <\/span><span style=\"color: #000000;\">Give the names of two energy sources that you would consider to be exhaustible.<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Coal and petroleum are two exhaustible sources of energy. These fuels were formed over million for years ago and there are only limited reserves. If we continue to use them as at present, these reserves will be exhausted soon.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 14pt; font-family: georgia, palatino, serif;\"><strong>Exercises<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>1. A solar heater cannot be used to get hot water on<\/strong><\/span><br \/>\n<span style=\"color: #000000;\">(a)\u00a0a sunny day,<\/span><br \/>\n<span style=\"color: #000000;\">(b)\u00a0a cloudy day,<\/span><br \/>\n<span style=\"color: #000000;\">(c)\u00a0a hot day,<\/span><br \/>\n<span style=\"color: #000000;\">(d)\u00a0a windy day.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>(b) a cloudy day<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>2. Which of the following is not a example of a bio-mass energy source ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\">(a)\u00a0wood,<\/span><br \/>\n<span style=\"color: #000000;\">(b)\u00a0gobar gas,<\/span><br \/>\n<span style=\"color: #000000;\">(c)\u00a0fossil fuels,<\/span><br \/>\n<span style=\"color: #000000;\">(d) bio-mass.\u00a0<\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>(c) fossil fuels<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>3. Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Suns energy ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\">(a)\u00a0geothermal energy,<\/span><br \/>\n<span style=\"color: #000000;\">(b)\u00a0wind energy,<\/span><br \/>\n<span style=\"color: #000000;\">(c)\u00a0fossil fuels,<\/span><br \/>\n<span style=\"color: #000000;\">(d)\u00a0bio-mass.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>(a) geothermal energy<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>4. Compare and contrast fossil fuels and the Sun as a source of energy.<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><\/span><\/p>\n<table style=\"border-collapse: collapse;\" border=\"1\">\n<tbody>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\"><strong>Fossil Fuel<\/strong><\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\"><strong>Energy from Sun<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Non-renewable source of energy.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Renewable source of energy.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Causes pollution in the environment.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Does not cause any pollution in the environment.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Produces large amount of energy.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Produces relatively less amount of energy.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Less amount of land is required to set up a power plant running on fossil fuels.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Huge space is required to generate substantial amount of energy by solar panels.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"color: #000000;\"><strong>5. Compare and contrast bio-mass and hydro-electricity as source of energy.<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong><\/span><\/p>\n<table style=\"border-collapse: collapse;\" border=\"1\">\n<tbody>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\"><strong>Bio-mass<\/strong><\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\"><strong>Hydro Electricity<\/strong><\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Biomass is a renewable energy source.<strong><br \/>\n<\/strong><\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Hydroelectricity is also is a renewable energy source.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Dead plants and animal wastes are used to create biomass. Hence, it is replenished organically.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">It is produced by utilizing the potential energy contained in water at a height.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Burning of biomass by causes air pollution<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">The use of hydroelectricity does not cause any pollution.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Biomass gives off heat energy, which can be used for cooking.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Hydroelectricity can run all types of electric appliances.<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Biomass energy can be obtained without using any special devices.<\/span><\/td>\n<td style=\"width: 50%;\"><span style=\"color: #000000;\">Hydroelectricity can be produced only by establishing hydropower plants.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div><\/div>\n<div id=\"outer-wrap\" class=\"site clr\">\n<div id=\"wrap\" class=\"clr\">\n<div id=\"content-wrap\" class=\"container clr\" style=\"text-align: justify;\">\n<div id=\"primary\" class=\"content-area clr\">\n<div id=\"content\" class=\"site-content clr\">\n<article id=\"post-7981\">\n<div class=\"entry-content clr\">\n<p><span style=\"color: #000000;\"><strong>6. What are the limitations of extracting energy from<\/strong><\/span><br \/>\n<span style=\"color: #000000;\">(a) the wind<\/span><br \/>\n<span style=\"color: #000000;\">(b) Waves<\/span><br \/>\n<span style=\"color: #000000;\">(c) Tides ?<\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>(a)<\/strong> Wind energy is harnessed by windmills. One of the limitations of extracting energy from wind is that a windmill requires wind of speed more than 15 km\/h to generate electricity. Also, a large number of windmills are required, which covers a huge area.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(b)<\/strong> Very strong ocean waves are required in order to extract energy from waves.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(c)<\/strong> Very high tides are required in order to extract energy from tides. Also, occurrence of tides depends on the relative positions of the Sun, moon, and the Earth.<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>7. On what basis you classify energy source as<\/strong><\/span><br \/>\n<span style=\"color: #000000;\">(a) Renewable and non-renewable ?<\/span><br \/>\n<span style=\"color: #000000;\">(b) Exhaustible and inexhaustible ?<\/span><br \/>\n<span style=\"color: #000000;\">(c) Are the options given in (a) and (b) the same ?<\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong>(a) Renewable sources of energy are those sources which can be regenerated again. Non-renewable sources of energy are those sources which would get depleted some day and cannot be regenerated.<\/span><br \/>\n<span style=\"color: #000000;\">(b) Exhaustible sources of energy are those which will be exhausted some day and cannot be regenerated. Inexhaustible sources of energy are those which can be regenerated again due to some continuing or repetitive currents of energy and are inexhaustible.<\/span><br \/>\n<span style=\"color: #000000;\">Options in both cases are exactly same.<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>8. What are qualities of an ideal source of energy ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>The qualities of ideal sources of energy are:<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">It supplies useful energy continuously.<\/span><\/li>\n<li><span style=\"color: #000000;\">It does not cause environment pollution.<\/span><\/li>\n<li><span style=\"color: #000000;\">It is economical.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong>9. What are the advantages and disadvantages of using a solar cooker ? Are there places where solar cookers would have limited utility ?\u00a0<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;<br \/>\n<\/strong><strong>Advantage of solar cooker :<\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">There is no cost of fuel.<\/span><\/li>\n<li><span style=\"color: #000000;\">It is environment friendly and there is no residue like ash etc.<\/span><\/li>\n<li><span style=\"color: #000000;\">Cooking is hygienic and nutritious.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong>Disadvantage of solar cooker :<\/strong><\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">The cooking is slow.<\/span><\/li>\n<li><span style=\"color: #000000;\">It cannot be used at all times.<\/span><\/li>\n<li><span style=\"color: #000000;\">A solar cooker can perform only limited functions.<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong>10. What are the environmental consequences of the increasing demand for energy ? What steps would you suggest to reduce energy consumption ?<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong>Industrialization increases the demand for energy. Fossil fuels are easily accessible sources of energy that fulfil this demand. The increased use of fossil fuels has a harsh effect on the environment. Too much exploitation of fossil fuels increases the level of greenhouse gas content in the atmosphere, resulting in global warming and a rise in the sea level. It is not possible to completely reduce the consumption of fossil fuels. However, some measures can be taken such as using electrical appliances wisely and not wasting electricity. Unnecessary usage of water should be avoided. Public transport system with mass transit must be adopted on a large scale. These small steps may help in reducing the consumption of natural resources and conserving them.<\/span><\/p>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-10-science\" target=\"_blank\" rel=\"noopener\"><b><i>Go Back To Chapters<\/i><\/b><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions Class 10 Science\u00a0 The NCERT Solutions in English Language for Class 10 Science Chapter &#8211; 14 (Sources of Energy) has been provided here to help the students in solving the questions from this exercise.\u00a0 Chapter &#8211; 14 (Sources of Energy)\u00a0 Questions 1. What is good source of energy ? Answer &#8211; A substance [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1125],"tags":[1385,1133,1414,1413,1388,5],"class_list":["post-6898","post","type-post","status-publish","format-standard","hentry","category-class-10-science","tag-class-10-ncert-science-solutions","tag-class-10-ncert-solutions","tag-ncert-class-10-science-chapter-14-sources-of-energy","tag-ncert-class-10-science-chapter-14-solutions","tag-ncert-class-10-science-solutions","tag-ncert-solutions-in-english"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions Class 10 (Science) Chapter 14 (Sources of Energy) | TheExamPillar NCERT<\/title>\n<meta name=\"description\" content=\"NCERT Solutions Class 10 Science\u00a0The NCERT Solutions in English Language for Class 10 Science Chapter - 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