{"id":4567,"date":"2016-05-17T09:49:00","date_gmt":"2016-05-17T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-physics-mechanicals-properties-of-fluids\/"},"modified":"2018-10-22T17:44:24","modified_gmt":"2018-10-22T12:14:24","slug":"ncert-solutions-class-11-physics-mechanicals-properties-of-fluids","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-physics-mechanicals-properties-of-fluids\/","title":{"rendered":"NCERT Solutions For Class 11 Physics Mechanical Properties of Fluids"},"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-class-11-physics-mechanicals-properties-of-fluids\/#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-class-11-physics-mechanicals-properties-of-fluids\/#CHAPTER_10_MECHANICAL_PROPERTIES_OF_FLUIDS\" >CHAPTER 10 MECHANICAL PROPERTIES OF FLUIDS<\/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-class-11-physics-mechanicals-properties-of-fluids\/#NCERT_Solutions_For_Class_11_physics_Mechanical_Properties_of_Fluids\" >NCERT Solutions For Class 11 physics Mechanical Properties of Fluids<\/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-class-11-physics-mechanicals-properties-of-fluids\/#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-class-11-physics-mechanicals-properties-of-fluids\/#CBSE_app_for_Class_11\" >CBSE app for Class 11<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions For Class 11 physics Mechanical Properties of Fluids 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\u00a0Mechanical Properties of Fluids<\/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 Mechanical Properties of Fluids\" width=\"149\" height=\"197\" \/><\/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_10_MECHANICAL_PROPERTIES_OF_FLUIDS\"><\/span>CHAPTER 10 MECHANICAL PROPERTIES OF FLUIDS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>10.1 Introduction<\/li>\n<li>10.2 Pressure<\/li>\n<li>10.3 Streamline flow<\/li>\n<li>10.4 Bernoulli\u2019s principle<\/li>\n<li>10.5 Viscosity<\/li>\n<li>10.6 Reynolds number<\/li>\n<li>10.7 Surface tension<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_For_Class_11_physics_Mechanical_Properties_of_Fluids\"><\/span>NCERT Solutions For Class 11 physics Mechanical Properties of Fluids<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">1. Explain why<\/p>\n<p style=\"text-align: justify;\">(a) The blood pressure in humans is greater at the feet than at the brain<\/p>\n<p style=\"text-align: justify;\">(b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km<\/p>\n<p style=\"text-align: justify;\">(c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area.<\/p>\n<p style=\"text-align: justify;\">2. Explain why<\/p>\n<p style=\"text-align: justify;\">(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.<\/p>\n<p style=\"text-align: justify;\">(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)<\/p>\n<p style=\"text-align: justify;\">(c) Surface tension of a liquid is independent of the area of the surface<\/p>\n<p style=\"text-align: justify;\">(d) Water with detergent dissolved in it should have small angles of contact.<\/p>\n<p style=\"text-align: justify;\">(e) A drop of liquid under no external forces is always spherical in shape<\/p>\n<p style=\"text-align: justify;\">3. Fill in the blanks using the word(s) from the list appended with each statement:<\/p>\n<p style=\"text-align: justify;\">(a) Surface tension of liquids generally . . . with temperatures (increases \/ decreases)<\/p>\n<p style=\"text-align: justify;\">(b) Viscosity of gases. with temperature, whereas viscosity of liquids . . . with temperature (increases \/ decreases)<\/p>\n<p style=\"text-align: justify;\">(c) For solids with elastic modulus of rigidity, the shearing force is proportional to &#8230;, while for fluids it is proportional to &#8230; (shear strain \/ rate of shear strain)<\/p>\n<p style=\"text-align: justify;\">(d) For a fluid in a steady flow, the increase in flow speed at a constriction follows (conservation of mass \/ Bernoulli&#8217;s principle)<\/p>\n<p style=\"text-align: justify;\">(e) For the model of a plane in a wind tunnel, turbulence occurs at a &#8230; speed for turbulence for an actual plane (greater \/ smaller)<\/p>\n<p style=\"text-align: justify;\">4. Explain why<\/p>\n<p style=\"text-align: justify;\">(a) To keep a piece of paper horizontal, you should blow over, not under, it<\/p>\n<p style=\"text-align: justify;\">(b) When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers<\/p>\n<p style=\"text-align: justify;\">(c) The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection<\/p>\n<p style=\"text-align: justify;\">(d) A fluid flowing out of a small hole in a vessel results in a backward thrust on the vessel<\/p>\n<p style=\"text-align: justify;\">(e) A spinning cricket ball in air does not follow a parabolic trajectory<\/p>\n<p style=\"text-align: justify;\">5. A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor?<\/p>\n<p style=\"text-align: justify;\">6. Toricelli&#8217;s barometer used mercury. Pascal duplicated it using French wine of density<img decoding=\"async\" style=\"height: 24px; width: 78px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image017.png\" \/>. Determine the height of the wine column for normal atmospheric pressure.<\/p>\n<p style=\"text-align: justify;\">7. A vertical off-shore structure is built to withstand a maximum stress of 109 Pa. Is the structure suitable for putting up on top of an oil well in the ocean? Take the depth of the ocean to be roughly 3 km, and ignore ocean currents.<\/p>\n<p style=\"text-align: justify;\">8. A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425<img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image033.png\" \/>. What maximum pressure would the smaller piston have to bear?<\/p>\n<p style=\"text-align: justify;\">9. A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit?<\/p>\n<p style=\"text-align: justify;\">10. In problem 10.9, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms? (Specific gravity of mercury = 13.6)<\/p>\n<p style=\"text-align: justify;\">11. Can Bernoulli&#8217;s equation be used to describe the flow of water through a rapid in a river? Explain.<\/p>\n<p style=\"text-align: justify;\">12. Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli&#8217;s equation? Explain.<\/p>\n<p style=\"text-align: justify;\">13. Glycerine flows steadily through a horizontal tube of length 1.5 m and radius 1.0 cm. If the amount of glycerine collected per second at one end is<img decoding=\"async\" style=\"height: 24px; width: 101px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image053.png\" \/>, what is the pressure difference between the two ends of the tube? (Density of glycerine = <img decoding=\"async\" style=\"height: 24px; width: 104px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image054.png\" \/> and viscosity of glycerine = 0.83 Pa s)<\/p>\n<p style=\"text-align: justify;\">14. In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m <img decoding=\"async\" style=\"height: 22px; width: 22px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image068.png\" \/>and 63 m <img decoding=\"async\" style=\"height: 22px; width: 22px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image068.png\" \/>respectively. What is the lift on the wing if its area is 2.5<img decoding=\"async\" style=\"height: 22px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image069.png\" \/>? Take the density of air to be 1.3 kg<img decoding=\"async\" style=\"height: 20px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image070.png\" \/>.<\/p>\n<p style=\"text-align: justify;\">15. Figures 10.23 (a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect? Why?<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 25\" style=\"height: 109px; width: 268px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image081.jpg\" alt=\"14159794259399.jpg\" \/><\/p>\n<p style=\"text-align: justify;\">16. The cylindrical tube of a spray pump has a cross-section of 8.0 <img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image086.png\" \/>one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m<img decoding=\"async\" style=\"height: 20px; width: 42px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image087.png\" \/>, what is the speed of ejection of the liquid through the holes?<\/p>\n<p style=\"text-align: justify;\">17. A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of <img decoding=\"async\" style=\"height: 22px; width: 61px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image097.png\" \/> N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film?<\/p>\n<p style=\"text-align: justify;\">18. Figure 10.24 (a) shows a thin liquid film supporting a small weight = <img decoding=\"async\" style=\"height: 22px; width: 63px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image101.png\" \/> N. What is the weight supported by a film of the same liquid at the same temperature in Fig. (b) and (c)? Explain your answer physically.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 34\" style=\"height: 127px; width: 285px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image102.jpg\" alt=\"14159794532537.jpg\" \/><\/p>\n<p style=\"text-align: justify;\">\n<p style=\"text-align: justify;\">19. What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20\u00b0C) is<img decoding=\"async\" style=\"height: 22px; width: 116px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image106.png\" \/>. The atmospheric pressure is <img decoding=\"async\" style=\"height: 22px; width: 64px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image107.png\" \/> Pa. Also give the excess pressure inside the drop.<\/p>\n<p style=\"text-align: justify;\">20. What is the excess pressure inside a bubble of soap solution of radius 5.00 mm, given that the surface tension of soap solution at the temperature (20 \u00b0C) is<img decoding=\"async\" style=\"height: 22px; width: 116px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image115.png\" \/>? If an air bubble of the same dimension were formed at depth of 40.0 cm inside a container containing the soap solution (of relative density 1.20), what would be the pressure inside the bubble? (1 atmospheric pressure is<img decoding=\"async\" style=\"height: 22px; width: 88px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image116.png\" \/>).<\/p>\n<p style=\"text-align: justify;\">21. A tank with a square base of area 1.0 <img decoding=\"async\" style=\"height: 20px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image127.png\" \/>is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area 20<img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image086.png\" \/>. The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. compute the force necessary to keep the door close.<\/p>\n<p style=\"text-align: justify;\">22. A manometer reads the pressure of a gas in an enclosure as shown in Fig. 10.25 (a) When a pump removes some of the gas, the manometer reads as in Fig. 10.25 (b) The liquid used in the manometers is mercury and the atmospheric pressure is 76 cm of mercury.<\/p>\n<p style=\"text-align: justify;\">(a) Give the absolute and gauge pressure of the gas in the enclosure for cases (a) and (b), in units of cm of mercury.<\/p>\n<p style=\"text-align: justify;\">(b) How would the levels change in case (b) if 13.6 cm of water (immiscible with mercury) are poured into the right limb of the manometer? (Ignore the small change in the volume of the gas).<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 51\" style=\"height: 161px; width: 233px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image141.jpg\" alt=\"1415979599813.jpg\" \/><\/p>\n<p style=\"text-align: justify;\">23. Two vessels have the same base area but different shapes. The first vessel takes twice the volume of water that the second vessel requires to fill upto a particular common height. Is the force exerted by the water on the base of the vessel the same in the two cases? If so, why do the vessels filled with water to that same height give different readings on a weighing scale?<\/p>\n<p style=\"text-align: justify;\">24. During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein? [Use the density of whole blood from Table 10.1].<\/p>\n<p style=\"text-align: justify;\">25. In deriving Bernoulli&#8217;s equation, we equated the work done on the fluid in the tube to its change in the potential and kinetic energy.<\/p>\n<p style=\"text-align: justify;\">(a) What is the largest average velocity of blood flow in an artery of diameter <img decoding=\"async\" style=\"height: 22px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image147.png\" \/> m if the flow must remain laminar?<\/p>\n<p style=\"text-align: justify;\">(b) Do the dissipative forces become more important as the fluid velocity increases? Discuss qualitatively.<\/p>\n<p style=\"text-align: justify;\">26. (a) What is the largest average velocity of blood flow in an artery of radius <img decoding=\"async\" style=\"height: 22px; width: 51px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image147.png\" \/>m if the flow must remain laminar?<\/p>\n<p style=\"text-align: justify;\">(b) What is the corresponding flow rate? (Take viscosity of blood to be <img decoding=\"async\" style=\"height: 22px; width: 78px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image152.png\" \/>Pa s).<\/p>\n<p style=\"text-align: justify;\">27. A plane is in level flight at constant speed and each of its two wings has an area of 25<img decoding=\"async\" style=\"height: 20px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image127.png\" \/>. If the speed of the air is 180 km\/h over the lower wing and 234 km\/h over the upper wing surface, determine the plane&#8217;s mass. (Take air density to be 1 kg <img decoding=\"async\" style=\"height: 20px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image127.png\" \/>).<\/p>\n<p style=\"text-align: justify;\">28. In Millikan&#8217;s oil drop experiment, what is the terminal speed of an uncharged drop of radius <img decoding=\"async\" style=\"height: 22px; width: 83px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image169.png\" \/>and density<img decoding=\"async\" style=\"height: 24px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image170.png\" \/>? Take the viscosity of air at the temperature of the experiment to be<img decoding=\"async\" style=\"height: 22px; width: 98px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image171.png\" \/>. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.<\/p>\n<p style=\"text-align: justify;\">29. Mercury has an angle of contact equal to 140\u00b0 with soda lime glass. A narrow tube of radius 1.00 mm made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside? Surface tension of mercury at the temperature of the experiment is 0.465 N<img decoding=\"async\" style=\"height: 20px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image185.png\" \/>. Density of mercury =<img decoding=\"async\" style=\"height: 24px; width: 116px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image186.png\" \/>.<\/p>\n<p style=\"text-align: justify;\">30. Two narrow bores of diameters 3.0 mm and 6.0 mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube? Surface tension of water at the temperature of the experiment is<img decoding=\"async\" style=\"height: 22px; width: 109px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image192.png\" \/>. Take the angle of contact to be zero and density of water to be <img decoding=\"async\" style=\"height: 24px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image193.png\" \/> (<img decoding=\"async\" style=\"height: 24px; width: 99px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image194.png\" \/>).<\/p>\n<p style=\"text-align: justify;\">31. (a) It is known that density <em><img decoding=\"async\" style=\"height: 18px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image001.png\" \/><\/em> of air decreases with height <em>y<\/em> as <img decoding=\"async\" style=\"height: 28px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image206.png\" \/><\/p>\n<p style=\"text-align: justify;\">Where <img decoding=\"async\" style=\"height: 25px; width: 100px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image207.png\" \/> is the density at sea level, and <img decoding=\"async\" style=\"height: 24px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image208.png\" \/>is a constant. This density variation is called the law of atmospheres. Obtain this law assuming that the temperature of atmosphere remains a constant (isothermal conditions). Also assume that the value of gremains constant.<\/p>\n<p style=\"text-align: justify;\">(b) A large He balloon of volume 1425 <img decoding=\"async\" style=\"height: 20px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image209.png\" \/> is used to lift a payload of 400 kg. Assume that the balloon maintains constant radius as it rises. How high does it rise?<\/p>\n<p style=\"text-align: justify;\">[Take <img decoding=\"async\" style=\"height: 24px; width: 18px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image210.png\" \/>= 8000 m and <img decoding=\"async\" style=\"height: 24px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image211.png\" \/>= 0.18 kg <img decoding=\"async\" style=\"height: 20px; width: 28px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/physics\/ch09\/image212.png\" \/>].<\/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 Mechanical Properties of Fluids 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 &#8230; <a title=\"NCERT Solutions For Class 11 Physics Mechanical Properties of Fluids\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-physics-mechanicals-properties-of-fluids\/\" aria-label=\"More on NCERT Solutions For Class 11 Physics Mechanical Properties of Fluids\">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":[281,1454],"tags":[283,1449,216,319],"class_list":["post-4567","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-physics-class-11","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 Mechanical Properties of Fluids<\/title>\n<meta name=\"description\" content=\"NCERT Solutions For Class 11 physics Mechanical Properties of Fluids in PDF format for free download. 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