{"id":4124,"date":"2016-05-06T11:49:00","date_gmt":"2016-05-06T11:49:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/"},"modified":"2018-06-07T14:28:52","modified_gmt":"2018-06-07T08:58:52","slug":"ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/","title":{"rendered":"NCERT Solutions for Class 9 Science Matter in our Surroundings part 1"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#NCERT_Class_9_Science_Chapter_wise_Solutions\" >NCERT Class 9 Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#NCERT_Solutions_for_Class_9_Science_Matter_in_our_Surroundings_part_1\" >NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#1_Which_of_the_following_are_matter\" >1. Which of the following are matter?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#2_Give_reasons_for_the_following_observation\" >2. Give reasons for the following observation:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#3_A_diver_is_able_to_cut_through_water_in_a_swimming_pool_Which_property_of_matter_does_this_observation_show\" >3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#4_What_are_the_characteristics_of_the_particles_of_matter\" >4. What are the characteristics of the particles of matter?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#1_The_mass_per_unit_volume_of_a_substance_is_called_density\" >1. The mass per unit volume of a substance is called density.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#2_a_Tabulate_the_differences_in_the_characteristics_of_states_of_matter\" >2. (a) Tabulate the differences in the characteristics of states of matter.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#3_Give_reasons\" >3. Give reasons<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#4_Liquids_generally_have_lower_density_as_compared_to_solids_But_you_must_have_observed_that_ice_floats_on_water_Find_out_why\" >4. Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#1_Convert_the_following_temperature_to_Celsius_scale\" >1. Convert the following temperature to Celsius scale:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#2_What_is_the_physical_state_of_water_at\" >2. What is the physical state of water at:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#3_For_any_substance_why_does_the_temperature_remain_constant_during_the_change_of_state\" >3. For any substance, why does the temperature remain constant during the change of state?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#4_Suggest_a_method_to_liquefy_atmospheric_gases\" >4. Suggest a method to liquefy atmospheric gases.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#1_Why_does_a_desert_cooler_cool_better_on_a_hot_dry_day\" >1. Why does a desert cooler cool better on a hot dry day?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#2_How_does_the_water_kept_in_an_earthen_pot_matka_become_cool_during_summer\" >2. How does the water kept in an earthen pot (matka) become cool during summer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#3_Why_does_our_palm_feel_cold_when_we_put_some_acetone_or_petrol_or_perfume_on_it\" >3. Why does our palm feel cold when we put some acetone or petrol or perfume on it?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#4_Why_are_we_able_to_sip_hot_tea_or_milk_faster_from_a_saucer_rather_than_a_cup\" >4. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#5_What_type_of_clothes_should_we_wear_in_summer\" >5. What type of clothes should we wear in summer?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#NCERT_Solutions_for_Class_9_Science\" >NCERT Solutions for Class 9 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/#CBSE_app_for_Class_9\" >CBSE app for Class 9<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 9 Science Matter in our Surroundings part 1 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Science\u00a0Matter in our Surroundings <a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/09_Science_Book.jpg\" alt=\"NCERT Solutions for Class 9 Science Matter in our Surroundings part 1\" width=\"178\" height=\"239\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_9_Science_Chapter_wise_Solutions\"><\/span><span class=\"underline-text\">NCERT Class 9 Science Chapter wise Solutions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>01 \u2013 \u00a0Matter in Our Surroundings<\/li>\n<li>02 \u2013 Is Mattter Around us Pure<\/li>\n<li>03 \u2013 Atoms and Molecules<\/li>\n<li>04 \u2013 Structure of the Atom<\/li>\n<li>05 \u2013 The Fundamental Unit of Life<\/li>\n<li>06 \u2013 Tissues<\/li>\n<li>07 \u2013 Diversity in Living Organisms<\/li>\n<li>08 \u2013 Motion<\/li>\n<li>09 \u2013 Force and Laws of Motion<\/li>\n<li>10 \u2013 Gravitation<\/li>\n<li>11 \u2013 Word and Energy<\/li>\n<li>12 \u2013 Sound<\/li>\n<li>13 \u2013 Why Do We Fall Ill<\/li>\n<li>14 \u2013 Natural Resources<\/li>\n<li>15 \u2013 Improvement in Food Resources<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science_Matter_in_our_Surroundings_part_1\"><\/span>NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6><span class=\"ez-toc-section\" id=\"1_Which_of_the_following_are_matter\"><\/span><strong>1. Which of the following are matter?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.<\/strong><\/p>\n<p><strong>Ans. <\/strong>Chair, air, smell, almonds, cold drink and smell of perfume are matter.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"2_Give_reasons_for_the_following_observation\"><\/span><strong>2. Give reasons for the following observation:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.<\/strong><\/p>\n<p><strong>Ans. <\/strong>Since hot sizzling food has temperature higher than cold food and at higher temperature diffusion rate (movement) of particles is very fast due to this the smell of hot sizzling reaches us from several metres away.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"3_A_diver_is_able_to_cut_through_water_in_a_swimming_pool_Which_property_of_matter_does_this_observation_show\"><\/span><strong>3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>If diver has ability to cut through water in a swimming pool then it shows that the particles of matter have a kind of force working between them. Because of this force the particles of matter remain together till some external force is applied.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"4_What_are_the_characteristics_of_the_particles_of_matter\"><\/span><strong>4. What are the characteristics of the particles of matter?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>The characteristics of particles of matter are as follows:<\/p>\n<p><strong>i) <\/strong>particles of matter have gap between them.<\/p>\n<p><strong>ii)<\/strong> particles of matter are in continuous motion<\/p>\n<p><strong>iii)<\/strong> particles of matter have an attraction force between them to keep them together.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"1_The_mass_per_unit_volume_of_a_substance_is_called_density\"><\/span><strong>1. The mass per unit volume of a substance is called density.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>(density = mass\/volume).<\/strong><\/p>\n<p><strong>Arrange the following in order of increasing density \u2013 air, exhaust from chimneys, honey, water, chalk, cotton and iron.<\/strong><\/p>\n<p><strong>Ans. <\/strong>Arranging substances in their increasing order of densities:<\/p>\n<p>Air&lt; exhaust from chimneys&lt; cotton&lt; water&lt; honey&lt; chalk&lt; iron.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"2_a_Tabulate_the_differences_in_the_characteristics_of_states_of_matter\"><\/span><strong>2. (a) Tabulate the differences in the characteristics of states of matter.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>(b) Comment upon the following:<\/strong><\/p>\n<p><strong>rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.<\/strong><\/p>\n<p><strong>Ans. (a)<\/strong><\/p>\n<p><img decoding=\"async\" id=\"Picture 4\" style=\"height: 271px; width: 655px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image001.png\" \/><\/p>\n<p><strong>(b)<\/strong> <strong>Rigidity<\/strong>\u2192 It is the property of matter to maintain its shape even if external forces work and the solids show this property.<\/p>\n<p><strong>Compressibility<\/strong> \u2192 It is the property of matter to allow compression under high pressure and the gases show this property.<\/p>\n<p><strong>Fluidity<\/strong> \u2192 It is the property of a substance to easily flow and allow change in its shape under external forces and this property is exhibited by both liquids and gases.<\/p>\n<p><strong>Filling a gas container<\/strong> \u2192 Gases can be compressed easily hence they can be filled within a vessel at high pressure. This property of gases allows their convenient filling into a small container or cylinder and that also in a large volume. It also allows their easy transport from one place to the other e.g. CNG.<\/p>\n<p><strong>Shape<\/strong>\u2192 According to the type of matter shape differs depending upon location of particles like Solids have definite shape while Liquids acquire the shape of their container and gases as such don\u2019t have any shape.<\/p>\n<p><strong>Kinetic energy<\/strong> \u2192 It is the kind of energy present in an object when it is under motion as the particles of that object\/matter are continuously moving therefore matter has kinetic energy. However greater is the movement more will be the kinetic energy and vice a versa i.e. solid &lt; liquid &lt; gas<\/p>\n<p><strong>Density<\/strong> \u2192 Mass per unit volume of a substance\/matter is known as its density i.e. density = mass\/volume<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"3_Give_reasons\"><\/span><strong>3. Give reasons<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>(a) A gas fills completely the vessel in which it is kept.<\/strong><\/p>\n<p><strong>(b) A gas exerts pressure on the walls of the container.<\/strong><\/p>\n<p><strong>(c) A wooden table should be called a solid.<\/strong><\/p>\n<p><strong>(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.<\/strong><\/p>\n<p><strong>Ans.(a)<\/strong> Since the attraction force between particles of a gas is negligible i.e. extremely less hence particles freely move\/flow in all possible directions as a result gas fills completely the vessel in which it is kept.<\/p>\n<p><strong>(b)<\/strong> Freely moving particles of gas hit the walls of its container continuously and randomly therefore such random and erratic motion of gas particles exerts pressure on the walls of the container.<\/p>\n<p><strong>(c)<\/strong> A wooden table particles are quite rigid, have a fixed location and also possess a definite shape and volume. Due to all these properties we should call a wooden table a solid substance.<\/p>\n<p><strong>(d) <\/strong>Air is a mixture of gases and since particles of gas are far apart so same is true for air therefore we can easily move our hand in air. But a solid block of wood is hard and rigid that resists any change in location of its particles hence we need a karate expert in case of a solid block of wood.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"4_Liquids_generally_have_lower_density_as_compared_to_solids_But_you_must_have_observed_that_ice_floats_on_water_Find_out_why\"><\/span><strong>4. Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>Ice represents solid state of water. If we observe its 3D structure, a large empty space is found inside ice as a result it becomes less in weight as compared to water. Due to its specific structure though solid, ice floats on water.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"1_Convert_the_following_temperature_to_Celsius_scale\"><\/span><strong>1. Convert the following temperature to Celsius scale:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>i) 300 K<\/strong><\/p>\n<p><strong>ii)573 K<\/strong><\/p>\n<p><strong>Ans. i) <img decoding=\"async\" style=\"height: 19px; width: 95px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image002.png\" \/><\/strong><\/p>\n<p><img decoding=\"async\" style=\"height: 19px; width: 166px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image003.png\" \/><img decoding=\"async\" style=\"height: 19px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image004.png\" \/><\/p>\n<p><strong>ii)<\/strong> <img decoding=\"async\" style=\"height: 19px; width: 188px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image005.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"2_What_is_the_physical_state_of_water_at\"><\/span><strong>2. What is the physical state of water at:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>a. <img decoding=\"async\" style=\"height: 19px; width: 47px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image006.png\" \/><\/strong><\/p>\n<p><strong>b. <img decoding=\"async\" style=\"height: 19px; width: 45px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image007.png\" \/><\/strong><\/p>\n<p><strong>Ans.<img decoding=\"async\" style=\"height: 19px; width: 45px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch01\/image008.png\" \/><\/strong>is the boiling point of water hence at both the temperatures water is in gaseous state i.e. water vapour.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"3_For_any_substance_why_does_the_temperature_remain_constant_during_the_change_of_state\"><\/span><strong>3. For any substance, why does the temperature remain constant during the change of state?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>During the change of state the heat or energy provided to particles of matter is utilized to take the particles of matter apart from each other as a result the temperature of substance or matter remains constant during change of state.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"4_Suggest_a_method_to_liquefy_atmospheric_gases\"><\/span><strong>4. Suggest a method to liquefy atmospheric gases.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>If we decrease temperature and increasing pressure we can liquefy the atmospheric gases.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"1_Why_does_a_desert_cooler_cool_better_on_a_hot_dry_day\"><\/span><strong>1. Why does a desert cooler cool better on a hot dry day?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>On a hot dry day rate of evaporation is faster. In a desert cooler when exhaust fan is on, hot air enters through the straw mates and at this site evaporation of water takes place and that also at faster rate. It takes away heat from air so the air becomes cool even cooler on a hot dry day.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"2_How_does_the_water_kept_in_an_earthen_pot_matka_become_cool_during_summer\"><\/span><strong>2. How does the water kept in an earthen pot (matka) become cool during summer?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>During summers the water present on the surface of the earthen pot evaporates which causes the cooling effect. Besides earthen pot bears pores on it hence evaporation occurs continuously so is cooling.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"3_Why_does_our_palm_feel_cold_when_we_put_some_acetone_or_petrol_or_perfume_on_it\"><\/span><strong>3. Why does our palm feel cold when we put some acetone or petrol or perfume on it? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>Some liquids get quickly vaporized and they are called volatile liquids. Acetone, petrol and perfume are also volatile liquids therefore they get heat from our palm and cause cooling.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"4_Why_are_we_able_to_sip_hot_tea_or_milk_faster_from_a_saucer_rather_than_a_cup\"><\/span><strong>4. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>Saucer has a bigger surface area as compared to cup. Since evaporation is a surface phenomenon, by using a saucer instead of cup we are increasing the surface are for evaporation to occur. Faster evaporation of particles of tea or milk allows cooling and taking a sip becomes easier.<\/p>\n<hr \/>\n<h6><span class=\"ez-toc-section\" id=\"5_What_type_of_clothes_should_we_wear_in_summer\"><\/span><strong>5. What type of clothes should we wear in summer?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p><strong>Ans. <\/strong>Cotton is a good absorb ant of water hence it absorbs sweat quite well and pores in the fabric expose that sweat to easy evaporation hence we should prefer wearing cotton clothes in summer.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science\"><\/span>NCERT Solutions for Class 9 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 9 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 9 Science includes text book solutions .NCERT Solutions for CBSE Class 9 Science have total 15 chapters. 9 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 9 solutions PDF and Science ncert class 9 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Class_9\"><\/span>CBSE app for Class 9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 9 Science, Computer Science, Home Science,Hindi ,English, Maths Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Matter in our Surroundings part 1 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT &#8230; <a title=\"NCERT Solutions for Class 9 Science Matter in our Surroundings part 1\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-matter-in-our-surroundings-part-1\/\" aria-label=\"More on NCERT Solutions for Class 9 Science Matter in our Surroundings part 1\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1377],"tags":[283,1344,216,349],"class_list":["post-4124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-09","tag-cbse-study-material","tag-class-9","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Matter in our Surroundings part 1<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 9 Science Matter in our Surroundings part 1 in PDF format for free download. 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