{"id":21265,"date":"2022-05-23T12:30:37","date_gmt":"2022-05-23T07:00:37","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=21265"},"modified":"2023-11-10T10:27:42","modified_gmt":"2023-11-10T04:57:42","slug":"selina-concise-physics-class-8-icse-solutions-heat-transfer","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-concise-physics-class-8-icse-solutions-heat-transfer\/","title":{"rendered":"Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\"><strong>Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer<\/strong><\/span><\/h2>\n<p><a class=\"button-red\" title=\"ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/icse-solutions\/\">ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/selina-concise-icse-solutions\/\">Selina ICSE Solutions<\/a><a class=\"button-blue\" title=\"ML Aggarwal ICSE Solutions for Class 8 Maths\" href=\"https:\/\/cbselibrary.com\/ml-aggarwal-icse-solutions-for-class-8-maths\/\">ML Aggarwal Solutions<\/a><\/p>\n<p>APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 6 Heat Transfer. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers Concise Physics for Class 8 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n<p><a class=\"button-red\" title=\"Selina Concise Physics Class 8 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-physics-class-8-icse-solutions\/\">Selina Class 8 Physics ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise Chemistry Class 8 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-chemistry-class-8-icse-solutions\/\">Chemistry<\/a><a class=\"button-blue\" title=\"Selina Concise Biology Class 8 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-biology-class-8-icse-solutions\/\">Biology<\/a><a class=\"button-blue\" title=\"Selina Concise Mathematics Class 8 ICSE Solutions\" href=\"https:\/\/cbselibrary.com\/selina-concise-mathematics-class-8-icse-solutions\/\">Maths<\/a><a class=\"button-blue\" title=\"ICSE Solutions for Class 8 Geography Voyage\" href=\"https:\/\/cbselibrary.com\/icse-solutions-class-8-geography-voyage\/\">Geography<\/a><a class=\"button-blue\" title=\"ICSE Solutions for Class 8 History and Civics\" href=\"https:\/\/cbselibrary.com\/icse-solutions-class-8-history-and-civics\/\">History &amp; Civics<\/a><\/p>\n<p><strong>Selina Concise ICSE Solutions for Class 8 Physics Chapter 6\u00a0Heat Transfer<\/strong><\/p>\n<ul>\n<li>\u00a0Heat is a form of energy. When two bodies are in contact heat flows from body at higher temperature to body at lower temperature till the lower temperature of both is same.<\/li>\n<li>\u00a0When a body is heated, its molecules move faster about their means position and kinetic energy increases and with fall in temperature their K.E. decreases.<\/li>\n<li>\u00a0When a substance is heated<br \/>\n(i) It expands i.e. a change in size takes place<br \/>\n(ii) Change in temperature takes place.<br \/>\n(iii) Change in state takes place.<\/li>\n<li><strong>CHANGE OF STATE :<\/strong> \u201cThe process of change from one state to another at a constant temperature is called change of state.\u201d<\/li>\n<li>Solid on heating changes into LIQUID. LIQUID on absorbing heat changes to VAPOURS some SOLIDS on heating DIRECTLY change in vapours called SUBLIMATION. Substance is called SUBLIMATE.<br \/>\nSOLIDIFICATION on cooling when a vapours change into SOLID. GAS OR VAPOURS on cooling \\(\\xrightarrow { Condensation }\\) changes to LIQUID also called LIQUIFACTION.<\/li>\n<li>\u00a0MELTING: Change of solid into liquid at constant temperature. FUSION \u21d2 FREEZING is change of LIQUID into SOLID at constant temperature and change of solid into liquid at a constant _ temperature is called FUSION.<\/li>\n<li>\u00a0EVAPORATION: \u201cChange liquid to gas at ALLTEMPERATURES\u201d It is surface phenomenon. &#8220;<\/li>\n<li>VAPOURIZATION : \u201cChange of liquid into vapours at fixed temperature\u201d.<\/li>\n<li>\u00a0METING POINT: \u201cIs the temperature at which a solid starts melting and remains constant till the whole of solid melts.\u201d<br \/>\nM.P. is same as freezing point.<br \/>\nM.P. of ice is 0\u00b0C or freezing point, of water is 0\u00b0C.<\/li>\n<li>\u00a0BOILING POINT: \u201cIs the temperature of a liquid at which it start, boiling i.e. change into vapours or gaseous state.\u201d<br \/>\nB .P. of pure water is 100\u00b0C.<\/li>\n<li>ABSOLUTE ZERO: \u201cThe temperature at which molecular motion completely ceases.\u201d<\/li>\n<li>\u00a0FACTORS EFFECTING THE RATE OF EVAPORATION :<br \/>\n(i) Temperature: Increases with increase in temperature<br \/>\n(ii) S.A.: Increases with increase in S.A.<br \/>\n(iii) BLOWING AIR\u2014Renewal of air increases evaporation.<br \/>\n(iv) NATURE\u2014Some liquids like spirit, alcohol, petrol evaporate easily.<\/li>\n<li>\u00a0EVAPOURATION \u2192 produces coolness, BOILING produces Hotness.<\/li>\n<li>\u00a0LINEAR EXPANSION: When a solid rod (metal) is heated change in length takes place, which depends upon<br \/>\n(i) original length (L<sub>0<\/sub>)<br \/>\n(ii) Increase in temperature<br \/>\n(iii) Material of rod.<br \/>\nLet L0 be the original length at 0\u00b0C, when heated to T\u00b0C final length becomes L<br \/>\nIncrease in length (L<sub>t<\/sub> &#8211; L<sub>0<\/sub>) a L<sub>0<\/sub> (T &#8211; 0)<br \/>\nOr<br \/>\nCoefficient of linear expension a which depends upon material of rod.<br \/>\nL<sub>t<\/sub>&#8211; L<sub>0<\/sub> = L<sub>0<\/sub> \u03b1 T<br \/>\n\u03b1 = L<sub>t<\/sub> &#8211; L<sub>0\u00a0<\/sub>\/\u00a0L<sub>0\u00a0<\/sub>T =\u00a0increase in length \/\u00a0original length \u00d7 Rise in temperature<\/li>\n<li>\u00a0When a metal plate is heated, change in area takes place and the expansion is called SUPERFICIAL expansion.<\/li>\n<li>\u00a0When a solid of volume v<sub>0\u00a0<\/sub>is heated change in volume called cubical expansion takes place.<\/li>\n<li>\u03b1 :\u00a0\u03b2 :\u00a0\u03b3 = 1 : 2 : 3<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>Test your self<\/strong><\/span><\/p>\n<p><span style=\"color: #3366ff;\"><strong>A. Objective Questions<\/strong><\/span><\/p>\n<p><strong>1. Write true or false for each statement<\/strong><\/p>\n<p><strong>(a)<\/strong> Evaporation is rapid on a wet day.<br \/>\n<strong>Answer.<\/strong> False.<\/p>\n<p><strong>(b)<\/strong> Evaporation takes place only from the surface of liquid.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(c)<\/strong> All molecules of a liquid take part in the process of evaporation.<br \/>\n<strong>Answer.<\/strong> False.<\/p>\n<p><strong>(d)<\/strong> Temperature of a liquid rises during boiling or vaporization<br \/>\n<strong>Answer<\/strong>. False.<\/p>\n<p><strong>(e)<\/strong> All molecules of a liquid take part in boiling.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(f)<\/strong> Boiling is a rapid phenomenon.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(g)<\/strong> All solids expand by the same amount when heated to the same rise in temperature.<br \/>\n<strong>Answer<\/strong>. False.<\/p>\n<p><strong>(h)<\/strong> Telephone wires are kept tight between the two poles in winter.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(i)<\/strong> Equal volumes of different liquids expand by the different amount when they are heated to the same rise in temperature.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(j)<\/strong> Solids expand the least and gases expand the most on being heated.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(k)<\/strong> A mercury thermometer makes use of the property of expansion of liquids on heating.<br \/>\n<strong>Answer.<\/strong> True.<\/p>\n<p><strong>(l)<\/strong> Kerosene contracts on heating.<br \/>\n<strong>Answer.<\/strong> False.<\/p>\n<p><strong>2. Fill in the blanks\u00a0<\/strong><\/p>\n<p><strong>(a)<\/strong> Boiling occurs at <strong>a fixed temperature.<\/strong><br \/>\n<strong>(b)<\/strong> Evaporation takes place at <strong>all temperature.<\/strong><br \/>\n<strong>(c)<\/strong> The molecules of liquid <strong>absorb<\/strong> heat from surroundings in evaporation.<br \/>\n<strong>(d)<\/strong> Heat is <strong>absorbed<\/strong> during boiling.<br \/>\n<strong>(e)<\/strong> Cooling is produced in <strong>evaporation.<\/strong><br \/>\n<strong>(f)<\/strong> A longer rod expands <strong>more<\/strong> than a shorter rod on being heated to the same temperature.<br \/>\n<strong>(g)<\/strong> Liquids expand <strong>more<\/strong> than the solids.<br \/>\n<strong>(h)<\/strong> Gases expand <strong>more<\/strong> than the liquids.<br \/>\n<strong>(i)<\/strong> Alcohol expands <strong>more<\/strong> than water.<br \/>\n<strong>(j)<\/strong> Iron expands <strong>less<\/strong> than copper.<\/p>\n<p><strong>3. Match the following<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66146\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-1.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 6 Heat Transfer 1\" width=\"527\" height=\"337\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-1.png 527w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-1-300x192.png 300w\" sizes=\"(max-width: 527px) 100vw, 527px\" \/><br \/>\n<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66148\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-2.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 6 Heat Transfer 2\" width=\"518\" height=\"193\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-2.png 518w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/01\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-6-Heat-Transfer-2-300x112.png 300w\" sizes=\"(max-width: 518px) 100vw, 518px\" \/><\/p>\n<p><strong>4. Select the correct alternative\u00a0<\/strong><\/p>\n<p><strong>(a)<\/strong> In evaporation<\/p>\n<ol>\n<li>all molecules of liquid begin to escape out<\/li>\n<li>\u00a0<strong>only the molecules at the surface escape out<\/strong><\/li>\n<li>\u00a0the temperature of liquid rises by absorbing heat from surroundings.<\/li>\n<li>\u00a0the molecules get attracted within the liquid.<\/li>\n<\/ol>\n<p><strong>(b)<\/strong> The rate of evaporation of a liquid increases when :<\/p>\n<ol>\n<li>\u00a0temperature of liquid falls<\/li>\n<li>\u00a0liquid is poured in a vessel of less surface area<\/li>\n<li>\u00a0<strong>air is blown above the surface of liquid<\/strong><\/li>\n<li>\u00a0humidity increases.<\/li>\n<\/ol>\n<p><strong>(c)<\/strong> During boiling or vaporization<\/p>\n<ol>\n<li>\u00a0<strong>all molecules take part<\/strong><\/li>\n<li>\u00a0temperature rises<\/li>\n<li>\u00a0no heat is absorbed<\/li>\n<li>\u00a0the average kinetic energy of molecules increases.<\/li>\n<\/ol>\n<p><strong>(d)<\/strong> The boiling point of a liquid is increased by<\/p>\n<ol>\n<li>\u00a0increasing the volume of liquid<\/li>\n<li>\u00a0<strong>increasing the pressure, on liquid<\/strong><\/li>\n<li>\u00a0adding ice to the liquid<\/li>\n<li>\u00a0decreasing pressure on liquid.<\/li>\n<\/ol>\n<p><strong>(e)<\/strong> Two rods A and B of the same metal, but of length 1 m and 2 m respectively, are heated from 0\u00b0C to 100\u00b0C. Then<\/p>\n<ol>\n<li>\u00a0both the rods A and B elongate the same<\/li>\n<li>\u00a0the rod A elongates more than the rod B<\/li>\n<li>\u00a0<strong>the rod B elongates more than the rod A<\/strong><\/li>\n<li>\u00a0the rod A elongates, but the rod B contracts.<\/li>\n<\/ol>\n<p><strong>(f)<\/strong> Two rods A and B of the same metal, same length, but one solid and the other hollow, are heated to the same rise in temperature.<br \/>\nThen<\/p>\n<ol>\n<li>\u00a0the solid rod A expands more than the hollow rod B<\/li>\n<li>\u00a0the hollow rod B expands more than the solid rod A<\/li>\n<li>\u00a0the hollow rod B contracts, but the solid rod A expands<\/li>\n<li>\u00a0<strong>both the rods A and B expand the same.<\/strong><\/li>\n<\/ol>\n<p><strong>(g)<\/strong> A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then.<\/p>\n<ol>\n<li>\u00a0alcohol contracts, but water expands<\/li>\n<li>\u00a0water contracts, but alcohol expands<\/li>\n<li>\u00a0water expands more than alcohol<\/li>\n<li>\u00a0<strong>alcohol expands more than water.<\/strong><\/li>\n<\/ol>\n<p><strong>(h)<\/strong> The increase in length of a metal rod depends on<\/p>\n<ol>\n<li>\u00a0the initial length of the rod only<\/li>\n<li>\u00a0the rise in temperature only<\/li>\n<li>\u00a0the material of rod only<\/li>\n<li><strong>\u00a0all the above three factors.<\/strong><\/li>\n<\/ol>\n<p><strong>(i)<\/strong> The correct statement is<\/p>\n<ol>\n<li>\u00a0Iron rims are cooled before they are placed on the cart wheels.<\/li>\n<li>\u00a0A glass stopper gets tighten on warming the neck of the bottle.<\/li>\n<li>\u00a0Telephone wires sag in winter, but become tight in summer.<\/li>\n<li><strong>\u00a0A little space is left between two rails on a railway track.<\/strong><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 6 Heat Transfer. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers Concise &#8230; <a title=\"Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer\" class=\"read-more\" href=\"https:\/\/cbselibrary.com\/selina-concise-physics-class-8-icse-solutions-heat-transfer\/\" aria-label=\"More on Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer\">Read more<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[7500,7499,7502,7504,7503,7497,7320,7496,7498,7506,7505,6283,7501],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.8 (Yoast SEO v18.4.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Selina Concise Physics Class 8 ICSE Solutions - Heat Transfer - CBSE Library<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cbselibrary.com\/selina-concise-physics-class-8-icse-solutions-heat-transfer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Selina Concise Physics Class 8 ICSE Solutions - Heat Transfer\" \/>\n<meta property=\"og:description\" content=\"Selina Concise Physics Class 8 ICSE Solutions &#8211; Heat Transfer ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 6 Heat Transfer. 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Heat Transfer ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 6 Heat Transfer. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers Concise ... 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