{"id":4557,"date":"2016-05-16T11:49:00","date_gmt":"2016-05-16T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-physics-units-and-measurements\/"},"modified":"2018-10-22T16:59:57","modified_gmt":"2018-10-22T11:29:57","slug":"ncert-solutions-for-class-11-physics-units-and-measurements","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-11-physics-units-and-measurements\/","title":{"rendered":"NCERT Solutions For Class 11 Physics Units and Measurements"},"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-11-physics-units-and-measurements\/#NCERT_Class_11_Physics_Chapter_wise_Solutions\" >NCERT Class 11\u00a0Physics 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-11-physics-units-and-measurements\/#CHAPTER_2_UNITS_AND_MEASUREMENTS\" >CHAPTER 2 UNITS AND MEASUREMENTS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-11-physics-units-and-measurements\/#NCERT_Solutions_For_Class_11_Physics_Units_and_Measurements\" >NCERT Solutions For Class 11 Physics Units and Measurements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-11-physics-units-and-measurements\/#NCERT_Solutions_for_Class_11_Physics\" >NCERT Solutions for Class 11 Physics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-11-physics-units-and-measurements\/#CBSE_app_for_Class_11\" >CBSE app for Class 11<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions For Class 11 Physics Units and Measurements Class 11 Physics Class 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 11 Physics chapter wise NCERT solution for Physics part 1 and Physics part 2 for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>Download\u00a0<a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-11-physics\/1340\/ncert-solutions\/5\/\">NCERT solutions for\u00a0Units and Measurements\u00a0<\/a>\u00a0as PDF.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/11%20physics%20Book%201.jpg\" alt=\"NCERT Solutions For Class 11 Physics Units and Measurements\" width=\"137\" height=\"181\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_11_Physics_Chapter_wise_Solutions\"><\/span>NCERT Class 11\u00a0Physics Chapter wise Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>1 \u2013 Physical World<\/li>\n<li>2 \u2013 Units and Measurements<\/li>\n<li>3 \u2013 Motion in a Straight line<\/li>\n<li>4 \u2013 Motion in a Plane<\/li>\n<li>5 \u2013 Laws of Motion<\/li>\n<li>6 \u2013 Work, Energy and Power<\/li>\n<li>7 \u2013 System of Particles and Rotational motion<\/li>\n<li>8 \u2013 Gravitation<\/li>\n<li>9 \u2013 Mechanical Properties of Solids<\/li>\n<li>10 \u2013 Mechanical properties of fluids<\/li>\n<li>11 \u2013 Thermal Properties of matter<\/li>\n<li>12 \u2013 Thermodynamics<\/li>\n<li>13 \u2013 Kinetic Theory<\/li>\n<li>14 \u2013 Oscillations<\/li>\n<li>15 \u2013 Waves<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CHAPTER_2_UNITS_AND_MEASUREMENTS\"><\/span>CHAPTER 2 UNITS AND MEASUREMENTS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>2.1 Introduction<\/li>\n<li>2.2 The international system of units<\/li>\n<li>2.3 Measurement of length<\/li>\n<li>2.4 Measurement of mass<\/li>\n<li>2.5 Measurement of time<\/li>\n<li>2.6 Accuracy, precision of instruments and errors in measurement<\/li>\n<li>2.7 Significant figures<\/li>\n<li>2.8 Dimensions of physical quantities<\/li>\n<li>2.9\u00a0Dimensional formulae and dimensional equations<\/li>\n<li>2.10\u00a0Dimensional analysis and its applications<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_For_Class_11_Physics_Units_and_Measurements\"><\/span>NCERT Solutions For Class 11 Physics Units and Measurements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">1. Fill in the blanks<\/p>\n<p style=\"text-align: justify;\">(a) The volume of a cube of side 1 cm is equal to&#8230;..<img decoding=\"async\" style=\"height: 22px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image001.png\" \/><\/p>\n<p style=\"text-align: justify;\">(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to<img decoding=\"async\" style=\"height: 31px; width: 48px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image002.png\" \/><\/p>\n<p style=\"text-align: justify;\">(c) A vehicle moving with a speed of <img decoding=\"async\" style=\"height: 23px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image003.png\" \/>covers&#8230;.m in 1 s<\/p>\n<p style=\"text-align: justify;\">(d) The relative density of lead is 11.3. Its density is&#8230;.<img decoding=\"async\" style=\"height: 25px; width: 49px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image004.png\" \/> or. &#8230;<img decoding=\"async\" style=\"height: 25px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image005.png\" \/>.<\/p>\n<p style=\"text-align: justify;\">2. Fill in the blanks by suitable conversion of units:<\/p>\n<p style=\"text-align: justify;\">(a) <img decoding=\"async\" style=\"height: 25px; width: 168px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image028.png\" \/><\/p>\n<p style=\"text-align: justify;\">(b) 1 m =&#8230;.. ly<\/p>\n<p style=\"text-align: justify;\">(c) <img decoding=\"async\" style=\"height: 23px; width: 143px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image029.png\" \/><\/p>\n<p style=\"text-align: justify;\">(d) <img decoding=\"async\" style=\"height: 31px; width: 312px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image030.png\" \/><\/p>\n<p style=\"text-align: justify;\">3. A calorie is a unit of heat or energy and it equals about 4.2 J where <img decoding=\"async\" style=\"height: 25px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image050.png\" \/>. Suppose we employ a system of units in which the unit of mass equals \u03b1 kg, the unit of length equals <img decoding=\"async\" style=\"height: 22px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image051.png\" \/> m, the unit of time is y s. Show that a calorie has a magnitude <img decoding=\"async\" style=\"height: 25px; width: 97px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image052.png\" \/>in terms of the new units.<\/p>\n<p style=\"text-align: justify;\">4. Explain this statement clearly:<\/p>\n<p style=\"text-align: justify;\">\u201cTo call a dimensional quantity &#8216;large&#8217; or &#8216;small&#8217; is meaningless without specifying a standard for comparison\u201d. In view of this, reframe the following statements wherever necessary:<\/p>\n<p style=\"text-align: justify;\">(a) atoms are very small objects<\/p>\n<p style=\"text-align: justify;\">(b) a jet plane moves with great speed<\/p>\n<p style=\"text-align: justify;\">(c) the mass of Jupiter is very large<\/p>\n<p style=\"text-align: justify;\">(d) the air inside this room contains a large number of molecules<\/p>\n<p style=\"text-align: justify;\">(e) a proton is much more massive than an electron<\/p>\n<p style=\"text-align: justify;\">(f) the speed of sound is much smaller than the speed of light.<\/p>\n<p style=\"text-align: justify;\">5. A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?<\/p>\n<p style=\"text-align: justify;\">6. Which of the following is the most precise device for measuring length:<\/p>\n<p style=\"text-align: justify;\">(a) a vernier callipers with 20 divisions on the sliding scale<\/p>\n<p style=\"text-align: justify;\">(b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale<\/p>\n<p style=\"text-align: justify;\">(c) an optical instrument that can measure length to within a wavelength of light?<\/p>\n<p style=\"text-align: justify;\">7. A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate on the thickness of hair?<\/p>\n<p style=\"text-align: justify;\">8. Answer the following:<\/p>\n<p style=\"text-align: justify;\">(a) You are given a thread and a metre scale. How will you estimate the diameter of the thread?<\/p>\n<p style=\"text-align: justify;\">(b) A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Do you think it is possible to increase the accuracy of the screw gauge arbitrarily by increasing the number of divisions on the circular scale?<\/p>\n<p style=\"text-align: justify;\">(c) The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only?<\/p>\n<p style=\"text-align: justify;\">9. The photograph of a house occupies an area of 1.75<img decoding=\"async\" style=\"height: 23px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image067.png\" \/>on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55<img decoding=\"async\" style=\"height: 22px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image068.png\" \/>. What is the linear magnification of the projector-screen arrangement?<\/p>\n<p style=\"text-align: justify;\">10. State the number of significant figures in the following:<\/p>\n<p style=\"text-align: justify;\">(a) 0.007 <img decoding=\"async\" style=\"height: 22px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image068.png\" \/><\/p>\n<p style=\"text-align: justify;\">(b) <img decoding=\"async\" style=\"height: 25px; width: 94px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image071.png\" \/><\/p>\n<p style=\"text-align: justify;\">(c) 0.2370 g <img decoding=\"async\" style=\"height: 23px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image072.png\" \/><\/p>\n<p style=\"text-align: justify;\">(d) 6.320 J<\/p>\n<p style=\"text-align: justify;\">(e) 6.032 N <img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image073.png\" \/><\/p>\n<p style=\"text-align: justify;\">(f) 0.0006032 <img decoding=\"async\" style=\"height: 22px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image068.png\" \/><\/p>\n<p style=\"text-align: justify;\">11. The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures.<\/p>\n<p style=\"text-align: justify;\">12. The mass of a box measured by a grocer&#8217;s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is<\/p>\n<p style=\"text-align: justify;\">(a) the total mass of the box,<\/p>\n<p style=\"text-align: justify;\">(b) the difference in the masses of the pieces to correct significant figures?<\/p>\n<p style=\"text-align: justify;\">13. A physical quantity <em>P<\/em> is related to four observables <em>a, b, c<\/em> and <em>d<\/em> as follows: <img decoding=\"async\" style=\"height: 48px; width: 60px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image081.png\" \/><\/p>\n<p style=\"text-align: justify;\">The percentage errors of measurement in <em>a<\/em>, <em>b<\/em>, <em>c<\/em> and <em>d<\/em> are 1%, 3%, 4% and 2%, respectively. What is the percentage error in the quantity <em>P<\/em>? If the value of <em>P<\/em> calculated using the above relation turns out to be 3.763, to what value should you round off the result?<\/p>\n<p style=\"text-align: justify;\">14. A book with many printing errors contains four different formulas for the displacement <em>y<\/em> of a particle undergoing a certain periodic motion:<\/p>\n<p style=\"text-align: justify;\">(a) <img decoding=\"async\" style=\"height: 39px; width: 89px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image084.png\" \/><\/p>\n<p style=\"text-align: justify;\">(b) <em>y<\/em> = <em>a<\/em> sin <em>vt<\/em><\/p>\n<p style=\"text-align: justify;\">(c) <img decoding=\"async\" style=\"height: 38px; width: 76px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image085.png\" \/><\/p>\n<p style=\"text-align: justify;\">(d) <img decoding=\"async\" style=\"height: 38px; width: 160px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image086.png\" \/><\/p>\n<p style=\"text-align: justify;\">(<em>a<\/em> = maximum displacement of the particle, <em>v<\/em> = speed of the particle. <em>T<\/em> = time-period of motion). Rule out the wrong formulas on dimensional grounds.<\/p>\n<p style=\"text-align: justify;\">15. A famous relation in physics relates \u2018moving mass\u2019 <em>m<\/em> to the \u2018rest mass\u2019 <img decoding=\"async\" style=\"height: 22px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image101.png\" \/>of a particle in terms of its speed <em>v<\/em> and the speed of light, <em>c<\/em>. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes: <img decoding=\"async\" style=\"height: 56px; width: 80px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image102.png\" \/><\/p>\n<p style=\"text-align: justify;\">16. The unit of length convenient on the atomic scale is known as an angstrom and is denoted by<img decoding=\"async\" style=\"height: 31px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image113.png\" \/>. The size of a hydrogen atom is about<img decoding=\"async\" style=\"height: 31px; width: 38px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image114.png\" \/>what is the total atomic volume in <img decoding=\"async\" style=\"height: 22px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image001.png\" \/>of a mole of hydrogen atoms?<\/p>\n<p style=\"text-align: justify;\">17. One mole of an ideal gas at standard temperature and pressure occupies 22.4 L (molar volume). What is the ratio of molar volume to the atomic volume of a mole of hydrogen? (Take the size of hydrogen molecule to be about 1<img decoding=\"async\" style=\"height: 29px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image122.png\" \/>). Why is this ratio so large?<\/p>\n<p style=\"text-align: justify;\">18. Explain this common observation clearly: If you look out of the window of a fast moving train, the nearby trees, houses etc. seem to move rapidly in a direction opposite to the train&#8217;s motion, but the distant objects (hill tops, the Moon, the stars etc.) seem to be stationary. (In fact, since you are aware that you are moving, these distant objects seem to move with you).<\/p>\n<p style=\"text-align: justify;\">19. The principle of &#8216;parallax&#8217; in section 2.3.1 is used in the determination of distances of very distant stars. The baseline <em>AB<\/em> is the line joining the Earth&#8217;s two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth&#8217;s orbit<img decoding=\"async\" style=\"height: 23px; width: 76px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image129.png\" \/>. However, even the nearest stars are so distant that with such a long baseline, they show parallax only of the order of 1&#8243; (second) of arc or so. A <em>parsec<\/em> is a convenient unit of length on the astronomical scale. It is the distance of an object that will show a parallax of 1&#8243; (second) of arc from opposite ends of a baseline equal to the distance from the Earth to the Sun. How much is a parsec in terms of meters?<\/p>\n<p style=\"text-align: justify;\">20. The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named <em>Alpha Centauri<\/em>) show when viewed from two locations of the Earth six months apart in its orbit around the Sun?<\/p>\n<p style=\"text-align: justify;\">21. Precise measurements of physical quantities are a <em>need<\/em> of science. For example, to ascertain the speed of an aircraft, one must have an accurate method to find its positions at closely separated instants of time. This was the actual motivation behind the discovery of radar in World War II. Think of different examples in modern science where precise measurements of length, time, mass etc. are needed. Also, wherever you can, give a quantitative idea of the precision needed.<\/p>\n<p style=\"text-align: justify;\">22. Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):<\/p>\n<p style=\"text-align: justify;\">(a) the total mass of rain-bearing clouds over India during the Monsoon<\/p>\n<p style=\"text-align: justify;\">(b) the mass of an elephant<\/p>\n<p style=\"text-align: justify;\">(c) the wind speed during a storm<\/p>\n<p style=\"text-align: justify;\">(d) the number of strands of hair on your head<\/p>\n<p style=\"text-align: justify;\">(e) the number of air molecules in your classroom.<\/p>\n<p style=\"text-align: justify;\">23. The Sun is a hot plasma (ionized matter) with its inner core at a temperature exceeding 107 K, and its outer surface at a temperature of about 6000 K. At these high temperatures, no substance remains in a solid or liquid phase. In what range do you expect the mass density of the Sun to be, in the range of densities of solids and liquids or gases? Check if your guess is correct from the following data: mass of the Sun = <img decoding=\"async\" style=\"height: 23px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image165.png\" \/> kg, radius of the Sun =<img decoding=\"async\" style=\"height: 23px; width: 58px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image166.png\" \/>m.<\/p>\n<p style=\"text-align: justify;\">24. When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be <img decoding=\"async\" style=\"height: 18px; width: 47px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image173.png\" \/>of arc. Calculate the diameter of Jupiter.<\/p>\n<p style=\"text-align: justify;\">25. A man walking briskly in rain with speed <em>v<\/em> must slant his umbrella forward making an angle <img decoding=\"async\" style=\"height: 18px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image177.png\" \/>\u00b8 with the vertical. A student derives the following relation between <img decoding=\"async\" style=\"height: 18px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image177.png\" \/>\u00b8 and <em>v<\/em>: tan <img decoding=\"async\" style=\"height: 18px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image177.png\" \/>\u00b8 = <em>v<\/em> and checks that the relation has a correct limit: as <em>v<\/em> \u2192 <em>0,<\/em> <img decoding=\"async\" style=\"height: 18px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image177.png\" \/>\u00b8 \u2192 0, as expected. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Do you think this relation can be correct? If not, guess the correct relation.<\/p>\n<p style=\"text-align: justify;\">26. It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s?<\/p>\n<p style=\"text-align: justify;\">27. Estimate the average mass density of a sodium atom assuming its size to be about 2.5<img decoding=\"async\" style=\"height: 29px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image122.png\" \/>. (Use the known values of Avogadro&#8217;s number and the atomic mass of sodium). Compare it with the density of sodium in its crystalline phase: 970 kg<img decoding=\"async\" style=\"height: 22px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image184.png\" \/>. Are the two densities of the same order of magnitude? If so, why?<\/p>\n<p style=\"text-align: justify;\">28. The unit of length convenient on the nuclear scale is a fermi: 1 f =<img decoding=\"async\" style=\"height: 23px; width: 38px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image192.png\" \/> m. Nuclear sizes obey roughly the following empirical relation: <img decoding=\"async\" style=\"height: 40px; width: 58px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image193.png\" \/><\/p>\n<p style=\"text-align: justify;\">where <em>r<\/em> is the radius of the nucleus, <em>A<\/em> its mass number, and <img decoding=\"async\" style=\"height: 24px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image194.png\" \/>is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise. 2.27.<\/p>\n<p style=\"text-align: justify;\">29. A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon&#8217;s surface. How much is the radius of the lunar orbit around the Earth?<\/p>\n<p style=\"text-align: justify;\">30. A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450<img decoding=\"async\" style=\"height: 23px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch01\/image206.png\" \/>).<\/p>\n<p style=\"text-align: justify;\">31. The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us?<\/p>\n<p style=\"text-align: justify;\">32. It is a well-known fact that during a total solar eclipse the disk of the moon almost completely covers the disk of the Sun. From this fact and from the information you can gather from examples 2.3 and 2.4, determine the approximate diameter of the moon.<\/p>\n<p style=\"text-align: justify;\">33. A great physicist of this century (P.A.M. Dirac) loved playing with numerical values of Fundamental constants of nature. This led him to an interesting observation. Dirac found that from the basic constants of atomic physics (<em>c<\/em>, <em>e<\/em>, mass of electron, mass of proton) and the gravitational constant <em>G<\/em>, he could arrive at a number with the dimension of time. Further, it was a very large number, its magnitude being close to the present estimate on the age of the universe (~15 billion years). From the table of fundamental constants in this book, try to see if you too can construct this number (or any other interesting number you can think of). If its coincidence with the age of the universe were significant, what would this imply for the constancy of fundamental constants?<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_11_Physics\"><\/span>NCERT Solutions for Class 11 Physics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 11 Physics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 11 physics includes text book solutions from both part 1 and part 2. NCERT Solutions for CBSE Class 11 Physics have total 15 chapters. 11 Physics NCERT Solutions in PDF for free Download on our website. Ncert physics class 11 solutions PDF and physics ncert class 11 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_11\"><\/span>CBSE app for Class 11<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 11 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home 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 11 Physics Units and Measurements Class 11 Physics Class 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. &#8230; <a title=\"NCERT Solutions For Class 11 Physics Units and Measurements\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-11-physics-units-and-measurements\/\" aria-label=\"More on NCERT Solutions For Class 11 Physics Units and Measurements\">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":[281,1415],"tags":[283,1449,216,319],"class_list":["post-4557","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-physics","tag-cbse-study-material","tag-class-11","tag-ncert-solutions","tag-physics"],"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 11 Physics Units and Measurements<\/title>\n<meta name=\"description\" content=\"NCERT Solutions For Class 11 Physics Units and Measurements in PDF format for free download. 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