{"id":21101,"date":"2022-06-04T13:30:15","date_gmt":"2022-06-04T08:00:15","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=21101"},"modified":"2023-01-25T11:05:33","modified_gmt":"2023-01-25T05:35:33","slug":"selina-concise-physics-class-8-icse-solutions-physical-quantities-and-measurement","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-concise-physics-class-8-icse-solutions-physical-quantities-and-measurement\/","title":{"rendered":"Selina Concise Physics Class 8 ICSE Solutions &#8211; Physical Quantities and Measurement"},"content":{"rendered":"<h2><strong><span style=\"color: #00ccff;\">Selina Concise Physics Class 8 ICSE Solutions &#8211; Physical Quantities and Measurement<\/span><\/strong><\/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 2 Physical Quantities and Measurement. You can download the Selina Concise Physics ICSE Solutions for Class 8 with Free PDF download option. Selina Publishers <a href=\"https:\/\/www.cbsetuts.com\/selina-concise-physics-class-8-icse-solutions\/\">Concise Physics for Class 8<\/a> 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 Concise physics Class 8 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 2 &#8211; Physical Quantities and Measurement<\/strong><\/p>\n<ul>\n<li>MASS Is the quantity of matter contained in a body.<br \/>\nVOLUME is the space occupied by body.<\/li>\n<li>Equal mass of IRON and cotton, iron will have less volume than cotton.<\/li>\n<li>Equal volume of Iron and cotton, the mass of iron is more than mass of cotton, because iron denser than cotton.<\/li>\n<li>DENSITY \u201cIs ratio of mass of substance to volume of substance\u201d<br \/>\nD = M\/V = KG\/M<sup>3<\/sup> The SI. unit of density is kg M<sup>-3<\/sup><\/li>\n<li>Density of a substance does not change with change in shape or size.<\/li>\n<li>When a substance is heated it expands and volume increases. Hence density decreases.<br \/>\nWater has maximum density at 4\u00b0C i.e. density of water increases from 0\u00b0C to 4\u00b0C and decreases above 4\u00b0C.<\/li>\n<li>Volume of substance is measured by formula V = L \u00d7 B \u00d7 H or 4\/3 or by measuring cylinder.<\/li>\n<li>Mass is measured by beam balance or spring balance.<\/li>\n<li>RELATIVE DENSITY of substance is the density compare with water i.e. How many times the substance is DENSER than water. Since density of water is 1 \u00a0Gcm<sup>-3<\/sup>, so density of a substance in Gcm<sup>-3<\/sup> = relative density of substance.<br \/>\nS.I. unit of R.D. &gt; has no units \u2014 since it is the ratio of same<br \/>\nquantities.<\/li>\n<li>If a substance has density more than liquid it SINKS in the liquid and if the density of substance is LESS than liquid it floats on liquid.<\/li>\n<li>BUOYANT FORCE \u201cThe force exerted by liquid acting vertically<br \/>\nupward on a body and is equal to the weight of liquid displaced by its immersed part.\u201d<\/li>\n<li>Weight of body Acting vertically downward. This force has the tendency to sink the body.<\/li>\n<li>\u00a0LAW OF FLOATATION \u201cWhen a body floats in a liquid, the weight of the liquid displaced by its immersed part is equal to the total weight of the body.\u201d While floating<br \/>\nwt. of floating body W=wt. of liquid displaced by its immersed part FB i.e. Apparent wt. of floating body is zero.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66106\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-1.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 1\" width=\"213\" height=\"158\" \/><\/li>\n<\/ul>\n<p>Density of body is greater than density of liquid. The body sinks.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66108\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-2.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 2\" width=\"193\" height=\"185\" \/><\/p>\n<p>Density of body is equal to the density of liquid. The body float where ever it is left in liquid.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66109\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-3.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 3\" width=\"188\" height=\"171\" \/><\/p>\n<p>Density of body is less than density of liquid. The body rises to the surface and floats.<\/p>\n<p style=\"text-align: center;\"><span style=\"color: #0000ff;\"><strong>Test yourself<\/strong><\/span><\/p>\n<p><span style=\"color: #0000ff;\">A. Objective Questions<\/span><\/p>\n<p><strong>1. Write true or false for each statement<\/strong><\/p>\n<p><strong>(a)<\/strong> Equal volumes of the two different substances have equal masses.<br \/>\n<strong>Answer<\/strong> False.<br \/>\nEqual volumes of the two different substances have different masses.<\/p>\n<p><strong>(b)<\/strong> The density of a piece of brass will change by changing its size or shape.<br \/>\n<strong>Answer<\/strong> False.<\/p>\n<p><strong>(c)<\/strong> The density of a liquid decreases with increase in its temperature.<br \/>\n<strong>Answer<\/strong> True.<\/p>\n<p><strong>(d)<\/strong> Relative density of water is 1.0.<br \/>\n<strong>Answer<\/strong> True.<\/p>\n<p><strong>(e)<\/strong> Relative density of a substance is expressed in g cm-3.<br \/>\n<strong>Answer<\/strong> False.<br \/>\nRelative density of a substance has no units.<\/p>\n<p><strong>(f)<\/strong> When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the liquid displaced by it.<br \/>\n<strong>Answer<\/strong> False.<br \/>\nThe buoyant force is equal to the weight of the liquid displaced by the immersed part of body.<\/p>\n<p><strong>(g)<\/strong> A body experiences the same buoyant force while floating in watr or alcohol.<br \/>\n<strong>Answer<\/strong> True.<\/p>\n<p><strong>(h)<\/strong> A body experiences the same buoyant force when it floats or sinks in water.<br \/>\n<strong>Answer<\/strong> False.<\/p>\n<p><strong>(i)<\/strong> A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part. .<br \/>\n<strong>Answer<\/strong> True.<\/p>\n<p><strong>(j)<\/strong> A body while floating, sinks deeper in a liquid of low density than in a liquid of high density.<br \/>\n<strong>Answer<\/strong> True.<\/p>\n<p><strong>2. Fill in the blanks<\/strong><\/p>\n<p><strong>(a)<\/strong> 1 kg is the mass of <strong>1000<\/strong> ml of water at 4\u00b0C.<br \/>\n<strong>(b)<\/strong> Mass = density x <strong>volume.<\/strong><br \/>\n<strong>(c)<\/strong> The S.I. unit of density is <strong>Kg m<sup>-3<\/sup><\/strong><br \/>\n<strong>(d)<\/strong> Density of water is <strong>1000<\/strong> Kg m<sup>-3<\/sup>.<br \/>\n<strong>(e)<\/strong> 1 g\u00a0cm<sup>-3<\/sup> = <strong>1000<\/strong> Kg m<sup>-3<\/sup>.<br \/>\n<strong>(f)<\/strong> The density of a body which sinks in water is <strong>more<\/strong> than 1000 Kg m<sup>-3<\/sup>.<br \/>\n<strong>(g)<\/strong> Abody sinks in a liquid A, butt floats in a liquid B. The density of liquid A is <strong>less<\/strong> than the density of liquid B.<br \/>\n<strong>(h)<\/strong> A body X sinks in water, but a body Y floats on water. The density of the body X is <strong>more<\/strong> than the density of body Y.<br \/>\n<strong>(i)<\/strong> The buoyant force experienced by a body when floating in salt\u00acwater is <strong>equal<\/strong> to or same that of when floating in pure water.<br \/>\n<strong>(j)<\/strong> The weight of a body floating in a liquid is <strong>zero.<\/strong><\/p>\n<p><strong>3. Match the following<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66110\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-4.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 4\" width=\"539\" height=\"411\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-4.png 539w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-4-300x229.png 300w\" sizes=\"(max-width: 539px) 100vw, 539px\" \/><\/p>\n<p><strong>4. Select the correct alternative\u00a0<\/strong><\/p>\n<p><strong>(a)<\/strong> The correct relation is<\/p>\n<ol>\n<li>Density = Mass x Volume<\/li>\n<li><strong>Mass = Density x Volume<\/strong><\/li>\n<li>\u00a0Volume = Density x Mass<\/li>\n<li>Density = Mass + Volume<\/li>\n<\/ol>\n<p><strong>(b)<\/strong> The relative density of alcohol is 0.8. Its density is<\/p>\n<ol>\n<li>\u00a00.8<\/li>\n<li><strong>800 kg nr3<\/strong><\/li>\n<li>\u00a0800 g cm-3<\/li>\n<li>0.8 kg m-3<\/li>\n<\/ol>\n<p><strong>(c)<\/strong> A block of wood of density 0.8 g cm-3 has a volume of 60 cm3. The mass of block is<\/p>\n<ol>\n<li>\u00a060.8 g<\/li>\n<li>\u00a075 g<\/li>\n<li><strong>48 g<\/strong><\/li>\n<li>0.013 g<\/li>\n<\/ol>\n<p><strong>(d)<\/strong> The density of aluminium is 2.7 g cm-3 and that of brass 8.4 g cm&#8217;3. The correct statement is<\/p>\n<ol>\n<li>\u00a0Equal masses of aluminium and brass have equal volumes<\/li>\n<li><strong>The mass of a certain volume of brass is more than the mass of equal volume of aluminium.<\/strong><\/li>\n<li>\u00a0The volume of a certain mass of brass is more than the volume of equal mass of aluminium.<\/li>\n<li>\u00a0Equal volumes of aluminium and brass have equal masses.<\/li>\n<\/ol>\n<p><strong>(e)<\/strong> A density bottle has a marking 25 mL on it. It means that:<\/p>\n<ol>\n<li>\u00a0the mass of density bottle is 25 g<\/li>\n<li><strong>the density bottle will store 25 ml of any liquid in it<\/strong><\/li>\n<li>\u00a0the density bottle will store 25 ml of water, but more volume of liquid denser than water.<\/li>\n<li>\u00a0the density bottle will store 25 ml of water, but more volume of a liquid lighter than water.<\/li>\n<\/ol>\n<p><strong>(f)<\/strong> The correct statement is<\/p>\n<ol>\n<li>\u00a0The buoyant force on a body is equal to the volume of the liquid displaced by it &#8216;<\/li>\n<li>The buoyant force on a body is equal to the volume of the body<\/li>\n<li><strong>The buoyant force on a body is equal to the weight of the liquid displaced by it<\/strong><\/li>\n<li>\u00a0The buoyant force on a body is always equal to the weight of the body.<\/li>\n<\/ol>\n<p><strong>(g)<\/strong> A piece of wood floats on water. The buoyant force on wood will be<\/p>\n<ol>\n<li>\u00a0zero<\/li>\n<li>\u00a0more than the weight of the wood piece<\/li>\n<li><strong>equal to the weight of the wood piece<\/strong><\/li>\n<li>less than the weight of the wood piece.<\/li>\n<\/ol>\n<p><strong>(h)<\/strong> The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will<\/p>\n<ol>\n<li><strong>sink<\/strong><\/li>\n<li>\u00a0float with its some part outside the liquid<\/li>\n<li>\u00a0float just below the surface of liquid<\/li>\n<li>float with whole of its volume above the surface of liquid.<\/li>\n<\/ol>\n<p><span style=\"color: #3366ff;\"><strong>B. Short\/Long Ans Questions\u00a0<\/strong><\/span><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 1.<\/strong><\/span><br \/>\nDefine the term density of a substance.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of a substance is defined as \u201cMass per Unit volume&#8221;.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66111\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-5.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 5\" width=\"366\" height=\"112\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-5.png 366w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-5-300x92.png 300w\" sizes=\"(max-width: 366px) 100vw, 366px\" \/><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 2.<\/strong><\/span><br \/>\nName the S.I. unit of density. How is it related to g Cm<sup>-3<\/sup> ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nS.I. unit of density is kg\u00a0M<sup>-3<\/sup> In C.GS. system unit of mass is g and unit of volume is Cm<sup>3<\/sup>, so CGS unit of density is g Cm<sup>-3<\/sup> (gram per cubic centimetre)<br \/>\nRelationship between S.I. and C.GS. units<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66112\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-6.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 6\" width=\"272\" height=\"254\" \/><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 3.<\/strong><\/span><br \/>\nThe density of brass is 8.4 g cm-3. What do you mean by this statement ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThis statement meAns one cubic centimetre volume of brass has mass of 8.4 g.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 4.<\/strong><\/span><br \/>\nArrange the following substances in order of their increasing density:<br \/>\nIron, Cork, Brass, Water, Mercury.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nCork, Water, Iron, Brass, Mercury.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 5.<\/strong><\/span><br \/>\nHow does the density of a liquid (or gas) vary with temperature?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMost of the liquids increase in volume with increase in temperature, but water shows anomalous behaviour. Water has maximum volume at 4\u00b0C and maximum density at 4\u00b0C.<br \/>\nActually, when volume increases density decreases and when volume decreases the density increases.<br \/>\nBut water when cooled from a high temperature, contracts upto 4\u00b0C because volume decreases and expands when cooled further below 4\u00b0C and hence density of water increases when it is cooled upto 4\u00b0C while decreases when cooled further below 4\u00b0C. In other words, the density of water is maximum at 4\u00b0C equal to 1 g Cm<sup>-3<\/sup> or lOOO kg m<sup>-3<\/sup>.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 6.<\/strong><\/span><br \/>\nA given quantity of a liquid is heated. Which of the following quantity will vary and how ?<br \/>\n(a) mass, (b) volume and (c) density<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nWhen a given quantity of liquid is heated<br \/>\n(a) Mass : does not change.<br \/>\n(b) Volume: changes and increases with rise in temperature.<br \/>\n(c) Density : Changes and decreases.<br \/>\nDensity = Mass \/ volume<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 7.<\/strong><\/span><br \/>\nDescribe an experiment to determine the density of the material of a coin.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity = Mass \/ volume<br \/>\nTo find the density of the material of a coin, we need to find its (i) mass\u2014by common beam balance and (ii) Its volume by measuring cylinder.<br \/>\nMeasure the mass of coin.<br \/>\nEXPERIMENT &#8211; Let the mass of coin shown by beam balance = M (gram) = 50 g (ray)<br \/>\nMeasure the vol. of coin.<br \/>\nInitial volume of water = V<sub>1<\/sub> = 40 ml (say)<br \/>\nFinal volume of water<br \/>\nWhen coin is added in the cylinder=V<sub>2<\/sub> = 50 ml (say)<br \/>\nThen vol. of coin = V<sub>2<\/sub> &#8211; V<sub>1<\/sub> = 50 &#8211; 40 = 10 ml<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66113\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-7.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 7\" width=\"480\" height=\"313\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-7.png 480w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-7-300x196.png 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 8.<\/strong><\/span><br \/>\nDescribe an experiment to determine the density of a liquid.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nTo determine the density of a liquid D = M \/ V<br \/>\nWe need to find (i) the vol. of liquid say milk, (ii) mass of liquid.<br \/>\nEXPERIMENT:<br \/>\n(i) To find the mass of milk:<br \/>\nwt. of empty 100 c.c beaker = M<sub>1\u00a0<\/sub>g = 70 g (say)<br \/>\nFill the beaker (half) with milk and weigh again=M<sub>2<\/sub> g = 116 g (say)<br \/>\n(ii) To find the vol. of milk:<br \/>\nTrAnsfer this milk into measuring cylinder and note the volume V = 40 c.c (say)<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66114\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-8.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 8\" width=\"410\" height=\"70\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-8.png 410w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-8-300x51.png 300w\" sizes=\"(max-width: 410px) 100vw, 410px\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66115\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-9.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 9\" width=\"366\" height=\"68\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-9.png 366w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-9-300x56.png 300w\" sizes=\"(max-width: 366px) 100vw, 366px\" \/><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 9.<\/strong><\/span><br \/>\nWhat is a density bottle ? How is it used to find the density of a liquid ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDENSITY bottle is a small glass bottle having a glass stopper at its neck. The bottle can store a fixed volume of a liquid. Generally the volume of bottle is 25 ml or 50 ml. Stopper has a narrow hole through it. When bottle is filled with liquid and stopper is inserted, THE EXCESS LIQUID RISES THROUGH THE HOLE and drains out. Thus the bottle will contain the same volume of liquid each time when it is filled. It is used to determine the density of a liquid.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66116\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-10.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 10\" width=\"348\" height=\"359\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-10.png 348w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-10-291x300.png 291w\" sizes=\"(max-width: 348px) 100vw, 348px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 10.<\/strong><\/span><br \/>\nDefine the term relative density of a substance.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n<strong>RELATIVE DENSITY<\/strong>: \u201cis the ratio of density of a substance to the density of water at 4\u00b0 C.\u201d<br \/>\nOr<br \/>\n<strong>RELATIVE DENSITY<\/strong> \u201cis theratio of mass of the substance to the mass of an equal volume of water at 4\u00b0 C.\u201d<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 11.<\/strong><\/span><br \/>\nWhat is the unit of relative density ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nUNIT OF RELATIVE DENSITY: No units since it is a pure ratio.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 12.<\/strong><\/span><br \/>\nDistinguish between density and relative density.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66117\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-11.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 11\" width=\"677\" height=\"359\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-11.png 677w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-11-300x159.png 300w\" sizes=\"(max-width: 677px) 100vw, 677px\" \/><br \/>\n<\/strong><\/span><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 13.<\/strong><\/span><br \/>\nExplain the meaning of the statement \u2018relative density of aluminium is 2.7\u2019 ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nThe statement \u2018Relative density of aluminium is 2.7\u2019 meAns .<br \/>\nA piece of aluminium of any volume has mass 2.7 times that of an equal volume of water.<br \/>\ni.e. Aluminium is 2.7 times heavier than water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 14.<\/strong><\/span><br \/>\nHow does the density of a body and that of a liquid determine whether the body will float or sink into that liquid ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nIf the density of a body is LESS than the density of LIQUID, the body will FLOAT on the surface of liquid.<br \/>\nIf the density of a body is MORE than the density of liquid, the body will SINK in a liquid.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 15.<\/strong><\/span><br \/>\nA cork piece floats on water surface while an iron nail sinks in it. Explain the reason.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nCORK floats on water meAns density of cork is LESS than density of water.<br \/>\nIRON nail: Sinks in water meAns density of iron nail is MORE than density of water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 16.<\/strong><\/span><br \/>\nWhich of the following will sink or float on water ? (Densityof water = 1 g Cm<sup>-3<\/sup>)<br \/>\n(a) body A having density 500 kg\u00a0m<sup>-3<\/sup><br \/>\n(b) body B having density 2520 kg m<sup>-3<\/sup><br \/>\n(c) body C having density 1100 kg m<sup>-3<\/sup><br \/>\n(d) body D having density 0.85 g m<sup>-3<\/sup><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of water = 1 g\u00a0Cm<sup>-3<\/sup><br \/>\n(a) Density of body A = 500 kg m<sup>-3<\/sup> = 500 \u00d7 = 0.5 = 0.5 g\u00a0Cm<sup>-3<\/sup><br \/>\nDensity of body A \u00a1s less than density of water hence A will float on water<br \/>\n(b) Density of body B = 2520 kg m<sup>-3<\/sup> = 2520 \u00d7 1\/1000 = 2.52 g\u00a0Cm<sup>-3<\/sup><br \/>\nDensity of body B is more than density of water and hence B will SiNK in water<br \/>\n(c) Density of body C = 1100kg\u00a0m<sup>-3<\/sup> = 1100 \u00d7 1\/1000 = 1.1 g Cm<sup>-3<\/sup><br \/>\nis greater than water.<br \/>\nHence, body C will sink in water.<br \/>\n(d) Density of body D = 0.85 g Cm<sup>-3<\/sup> &lt; 1.0 g Cm<sup>-3<\/sup><br \/>\nDensity of body D is less than the density of water hence body D will FLOAT on water<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 17.<\/strong><\/span><br \/>\nWhat is the iaw of floatation ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nWhen a body floats in a liquid, the weight of the liquid displaced by its immersed part is equal to the total weight of the body. This is the law of floatation, i.e. while floating. Weight of the floating body = Weight of the liquid displaced by its immersed part.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 18.<\/strong><\/span><br \/>\nThe density of water is 1.0 g Cm<sup>-3<\/sup>. The density of iron is 7.8 \u00d7 10&#8243;3 g Cm<sup>-3<\/sup>. The density of mercury is 13.6 g Cm<sup>-3<\/sup>.<br \/>\nAns the following:<br \/>\n(a) Will a piece of iron float or sink in water ?<br \/>\n(b) Will a piece of iron float or sink in mercury ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of water 1.0 g Cm<sup>-3<\/sup><sup><br \/>\n<\/sup>(a) Density of piece of iron = 7.8 \u00d7 10<sup>-3<\/sup> g Cm<sup>-3<\/sup><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66118\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-12.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 12\" width=\"422\" height=\"62\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-12.png 422w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-12-300x44.png 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><br \/>\n\u2234 Density of piece of iron is LESS than density of water.<br \/>\nHence, piece of iron will FLOAT in water.<br \/>\n(b) Density of piece of iron = 7.8 \u00d7\u00a010<sup>-3<\/sup><br \/>\nDensity of mercury is 13.6 \u00d7 10<sup>-3<\/sup> g Cm<sup>-3<\/sup><br \/>\nSince 7.8 \u00d7\u00a010<sup>-3<\/sup>\u00a0&lt; 13.6\u00a0\u00d7 10<sup>-3<\/sup><br \/>\n\u2234 Density of piece of iron is LESS than density of mercury<br \/>\n\u2234 Piece of iron will FLOAT in mercury<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 19.<\/strong><\/span><br \/>\nThe diagram given below show a body floating in three different liquids. A, B and C at different levels.<br \/>\n(a) In which liquid does the body experience the greatest buoyant force ?<br \/>\n(b) Which liquid has the least density ?<br \/>\n(c) Which liquid has the highest density ?<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66119\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-13.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 13\" width=\"472\" height=\"206\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-13.png 472w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-13-300x131.png 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/><img loading=\"lazy\" class=\"alignnone size-full wp-image-66120\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-14.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 14\" width=\"248\" height=\"198\" \/><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n(a) Buoyant force is same in each case as the wt. of body is same in each case and Buoyant force is equal to the weight of liquid displaced by the immersed part of body which balances the wt. of body.<br \/>\n(b) The liquid A has the least density as body immerses the maximum.<br \/>\n(c) Liquid C has the highest density as the body immerses the least.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 20.<\/strong><\/span><br \/>\nFor a floating body, how is its weight related to the buoyant force ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nWhen a body floats in a liquid. The weight of the liquid displaced by its immersed part is equal to the total weight of the body.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 21.<\/strong><\/span><br \/>\nWhy does a piece of ice float on water ?<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nFLOATATION OF ICE ON WATER : Density of 0.9 g Cm<sup>-3<\/sup> is less than density of water 1 g Cm<sup>-3<\/sup>. Hence, ice floats on water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 22.<\/strong><\/span><br \/>\nExplain why an iron needle sinks in water, but a ship made of iron floats on water.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of iron is more than density of water, \u2234 weight of iron nail is more than wt. of water displaced by it and nail SINKS. While shape of iron ship is made in such a way that it displaces MORE WEIGHT OF WATER than its own weight. Secondly the ship is HOLLOW and THE EMPTY SPACE contains AIR which makes the AVERAGE DENSITY OF SHIP LESS THAN THAT OF WATER and hence ship floats on water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 23.<\/strong><\/span><br \/>\nIt is easier to swim in sea water than in river water. Explain the reason.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of sea water is greater than density of river water, [because of impurities]<br \/>\n(i) In each case the weight of water displaced will be equal to the weight of the man.<br \/>\n\u2234 Ratio of weight of sea water and river water displaced by man is 1: 1.<br \/>\n(ii) With smaller portion of man\u2019s body submerged in sea water, the wt. of sea water displaced is equal to the total weight of body. While to displace the same weight of river water, a larger portion of the body will have to be submerged \u00a1n water.<br \/>\n\u2234 It is easier for man to swim in sea water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 24.<\/strong><\/span><br \/>\nIcebergs floating on sea water are dangerous for ships. Explain the reason.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nICEBERGS are very dangerous for ships as ICEBERGS are huge masses of ice floating in sea [density of ice being 0.917 g Cm<sup>-3<\/sup>]<br \/>\nwith about 9\/10 portion below water and only 1\/10 portion of it above surface of water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 25.<\/strong><\/span><br \/>\nExplain why it is easier to lift a stone under water than in air.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nIn water, the stone experience a buoyant force which counter balances the weight of the stone acting downward and this makes the stone lighter and thus easier to lift the stone in water.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 26.<\/strong><\/span><br \/>\nWhat is a submarine ? How can it be made to\u2019dive in water and come to the surface of water.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nSUBMARINE: Submarine is a water-tight boat which can travel under water like a ship. It is providgd with water tanks. When submarine is to dive, water is filled in water tanks and it is made heavier and average density of submarine becomes greater than the density of sea water and it sinks. To make the submarine rise to the surface of water,\u00a0water tanks are emptied and average density.of submarine becomes less than the density of sea water and it rises to surface of water.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66121\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-15.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 15\" width=\"421\" height=\"240\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-15.png 421w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-15-300x171.png 300w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><\/p>\n<p>While submarine is underwater soldiers can see the enemy activities through periscope.<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 27.<\/strong><\/span><br \/>\nA balloon filled with hydrogen rises in air. Explain the reason.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>A balloon filled with hydrogen rises to a certain height as it displaces more wt. of air than wt. of balloon but as it rises higher density of air DECREASES there and upthrust becomes less and ultimately upthrust becomes equal to the weight of balloon and balloon stops rising further.<\/p>\n<p><span style=\"color: #3366ff;\"><strong>C. Numericals<\/strong><\/span><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 1.<\/strong><\/span><br \/>\nThe density of air is 1.28 g\/Iitre. Express it in:<br \/>\n(a) g cm<sup>3<\/sup> (b) kg m<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\n(a) The density of air is I .28g\/litre<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66122\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-16.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 16\" width=\"426\" height=\"120\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-16.png 426w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-16-300x85.png 300w\" sizes=\"(max-width: 426px) 100vw, 426px\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 2.<\/strong><\/span><br \/>\nThe dimensions of a hail are 10 m \u00d7 7 m \u00d7 5 m. If the density of air is 1.11 kg m<sup>-3<\/sup>, find the m\u00e3ss of air in the hail.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>The dimensions of hall 10m \u00d7 7m \u00d7 5m<br \/>\ni.e. V350 m<sup>3<\/sup><br \/>\nDensity of air(D)= 1.11 kg m<sup>-3<\/sup><br \/>\nM = V \u00d7 D 350 \u00d7 \u00a01.11 =388.5 kg<\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 3.<\/strong><\/span><br \/>\nThe density of aluminium is 2.7 g cm3. Express it in kg m<sup>-3<\/sup><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>Density of aluminium = 2.7 g\/Cm<sup>3<\/sup><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66123\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-17.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 17\" width=\"323\" height=\"71\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-17.png 323w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-17-300x66.png 300w\" sizes=\"(max-width: 323px) 100vw, 323px\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 4.<\/strong><\/span><br \/>\nThe density of alcohol is 600 kg m<sup>-3<\/sup>. Express it in g Cm<sup>-3<\/sup>.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>Density of alcohol is = 600 kg\/m<sup>-3<\/sup><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-66124\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-18.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 18\" width=\"307\" height=\"61\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-18.png 307w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-18-300x60.png 300w\" sizes=\"(max-width: 307px) 100vw, 307px\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 5.<\/strong><\/span><br \/>\nA piece of zinc of mass 438.6 g has a volume of 86 Cm<sup>3<\/sup>. Calculate the density of zinc.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span><\/p>\n<p>Mass of Zinc (M) = 438.6 g<br \/>\nVolume V = 86 Cm<sup>3<\/sup><br \/>\nDensity (D) = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66125\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-19.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 19\" width=\"304\" height=\"77\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-19.png 304w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-19-300x76.png 300w\" sizes=\"(max-width: 304px) 100vw, 304px\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 6.<\/strong><\/span><br \/>\nA piece of wood of mass 150 g has a volume of 200 Cm<sup>3<\/sup>. Find the density of wood \u00a1n<br \/>\n(a) C.GS. unit, (b) S.l. unit<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>(a) Mass of wood (M) = 150 g<br \/>\nVolume of wood (V) = 200 Cm<sup>3<\/sup><br \/>\nDensity (D) =?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66126\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-20.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 20\" width=\"305\" height=\"76\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-20.png 305w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-20-300x75.png 300w\" sizes=\"(max-width: 305px) 100vw, 305px\" \/><br \/>\n(b) In S.I. system = 0.75 \u00d7 1000 750 kg\/\u00a0m<sup>3<\/sup><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 7.<\/strong><\/span><br \/>\nCalculate the volume of wood of mass 6000 kg if the density of wood is 0.8 g Cm<sup>-3<\/sup><br \/>\n<span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>Volume of wood (V) = ?<br \/>\nMass of wood (M) = 6000 kg<br \/>\nDensity of wood D = 0.8 g\/ Cm<sup>3<\/sup><br \/>\nD=O.8g\/Cm<sup>3<\/sup>=o.8 \u00d7 IOOO = 800kg \/m<sup>3<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66127\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-21.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 21\" width=\"555\" height=\"69\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-21.png 555w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-21-300x37.png 300w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><br \/>\n<\/sup><\/p>\n<p><span style=\"color: #eb4924;\"><strong>Question 8.<\/strong><\/span><br \/>\nCalculate the density of solid from the following data :<br \/>\n(a) Mass of solid = 72 g<br \/>\n(b) Initial volume of water in measuring cylinder = 24 ml<br \/>\n(c) Final volume of water when solid is completely immersed in water = 42 ml<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMass of solid (M) = 72 g<br \/>\nIntial volume of water V<sub>1<\/sub> = 24 ml<br \/>\nFinal volume of water V<sub>2<\/sub> = 42 ml<br \/>\nVolume of solid (V) = V<sub>2<\/sub> &#8211; V<sub>1<\/sub> = 42 &#8211; 24 = 18 Cm<sup>3<br \/>\n<\/sup>Density of solid (D) = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66128\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-22.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 22\" width=\"280\" height=\"63\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 9.<\/strong><\/span><br \/>\nThe mass of an empty density bottle is 21.8 g, when filled completely with water is 41.8 g and when filled completely with liquid it is 40.6 g. Find :<br \/>\n(a) the volume of density bottle<br \/>\n(b) the relative density of liquid<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nDensity of water is 1 g Cm<sup>3<\/sup><br \/>\n\u2234 Volume of density bottle = weight of water in grams completely filling the bottle<br \/>\n(a) Volume of density bottle:<br \/>\nMass of empty density bottle = M<sub>1<\/sub> =21.8 g<br \/>\nMass of bottle + water = M<sub>2<\/sub>\u00a0 41.8 g<br \/>\n\u2234 Mass of water completely fih1ig the density bottle = M<sub>2<\/sub> \u2014 M<sub>1<\/sub><br \/>\n=41.8 \u201421.8<br \/>\n20g<br \/>\nBut 1 g of water has volume = 1 cc<br \/>\n\u2234 Volume of bottle (density bottle) = volume of water =20 c.c. =20 ml<br \/>\n(b) The relative density of liquid:<br \/>\nMass of 20 c.c. of liquid = (mass of density bottle + mass of 20 c.c of liquid- mass of density bottle)<br \/>\n= 40.6\u201421.8<br \/>\n= 18.8 g<br \/>\nMass of 20 C.C of water = 20g<br \/>\nRelative density of liquid<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66129\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-23.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 23\" width=\"442\" height=\"134\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-23.png 442w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-23-300x91.png 300w\" sizes=\"(max-width: 442px) 100vw, 442px\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 10.<\/strong><\/span><br \/>\nFrom the following observations, calculate the density and relative density of a brine solution. Mass of empty density<br \/>\nbottle = 22 g<br \/>\nMass of bottle + water = 50 g<br \/>\nMass of bottle + brine solution = 54 g<\/p>\n<p><span style=\"color: #008000;\"><strong>Answer:<br \/>\n<\/strong><\/span>Mass of empty bottle, M<sub>1<\/sub> = 22 g<br \/>\nMass of bottle + water, M<sub>2<\/sub> =50 g<br \/>\nMass of bottle + brine solution, M<sub>3<\/sub> =54 g<br \/>\nMass of water = M<sub>2<\/sub> \u2014 M<sub>1<\/sub> =50\u201422=28 g<br \/>\nMass of brine solution = M<sub>3<\/sub> \u2014 M<sub>1<\/sub> 54\u201422 = 32 g<br \/>\nDensity of brine solution =\u00a0Mass of brine solution \/ Mass of water<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66130\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-24.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 24\" width=\"210\" height=\"80\" \/><br \/>\n<span style=\"color: #eb4924;\"><strong>Question 11.<\/strong><\/span><br \/>\nThe mass of an empty density bottlfe is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find :<br \/>\n(a) volume of density bottle,<br \/>\n(b) density of liquid, and<br \/>\n(c) relative density of liquid.<br \/>\n<span style=\"color: #008000;\"><strong>Answer:<\/strong><\/span><br \/>\nMass of empty density bottle (M<sub>1<\/sub>) =30 g<br \/>\nMass of bottle + Water (M<sub>2<\/sub>) 75 g<br \/>\nMass of liquid + Liquidx (M<sub>3<\/sub>)= 65 g<br \/>\nMass ofwater=M<sub>2<\/sub>\u2014M<sub>1<\/sub>=75\u201430=45 g<br \/>\n(a) Volume of density bottle = Mass of water 45 g<br \/>\n(b) Density of Iiquid x = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66131\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-25.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 25\" width=\"415\" height=\"181\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-25.png 415w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-25-300x131.png 300w\" sizes=\"(max-width: 415px) 100vw, 415px\" \/><br \/>\n(c) Mass of water in the density bottle =75 \u2014 30 = 45 g<br \/>\n\u2234 Volume of water in density bottle = 45 cc<br \/>\nand mass of equal volume of liquid in density bottle 65\u201430 = 35g<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-66132\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-26.png\" alt=\"Selina Concise Physics Class 8 ICSE Solutions Chapter 2 Physical Quantities and Measurement 26\" width=\"491\" height=\"92\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-26.png 491w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2019\/12\/Selina-Concise-Physics-Class-8-ICSE-Solutions-Chapter-2-Physical-Quantities-and-Measurement-26-300x56.png 300w\" sizes=\"(max-width: 491px) 100vw, 491px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selina Concise Physics Class 8 ICSE Solutions &#8211; Physical Quantities and Measurement ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 2 Physical Quantities and Measurement. 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Physical Quantities and Measurement ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 8 Physics Chapter 2 Physical Quantities and Measurement. 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