University of Birmingham. Each question has four choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct. We know that 1 Pa = 1Nm-2 and 1N = 1kgms-2 Why is it important to measure the viscosity of substances? Lubricants for machine systems also work the way they do in part as a result of their viscosity. The viscosity of a fluid is a measure of the internal resistance to flow! It is caused by intermolecular forces and transport of momentum within the fluid. long questions & short questions for Class 11 on EduRev as well by searching above. For example, honey is more viscous than water. The solved questions answers in this Test: Viscosity And Surface Tension quiz give you a good mix of easy questions and tough questions. Where η is the coefficient of viscosity of the liquid. Learn more about it in this article. gr. Ten poise equal one pascal second [Pa s] making the centipoise [cP] and millipascal second [mPa s] identical. This test is Rated positive by 85% students preparing for Class 11.This MCQ test is related to Class 11 syllabus, prepared by Class 11 teachers. How does the viscosity of liquid and gases change? Select the correct answer from the code given below. Stoke’s Law. s is placed between two plates, and one plate is pushed sideways with a shear stress of one pascal, it moves a distance equal to the thickness of the layer between the plates in one second. Because the repeatability and reproducibility of the coating procedure are often closely linked to the coating’s viscosity, it is a key parameter to control. Surface tension = N m-1 Informally, viscosity is the quantity that describes a fluid's resistance to flow. You can think of water (low viscosity) and honey (high viscosity). Surface tension III. Which of the following properties of water can be used to explain the spherical shape of rain droplets? b) True, only due to cohesive force, all the molecules of droplets(which are like molecule) are attracted towards each other to form drop What is fluidity of a liquid? Have you ever experienced the frustration of trying to get ketchup out of the bottle? Ketchup and Viscosity (the question may be found in lesson 4). Answers to questions 1. Question: 13 This Question Concerns Core Practical 4; The Measurement Of Viscosity Of A Liquid Using The Falling Ball Method. Small liquid drops have spherical shape as they try to reduce their surface tension and their surface area. Viscosity's conditional connections mechanism makes it easy to have Viscosity only connect to a VPN server on certain networks, or only in certain environments. Hexane has induced dipole-induced dipole force which is a weak force. For latent heat, we have J kg-1 and not as in p. Direction (Q. Nos. *Response times vary by subject and question complexity. By continuing, I agree that I am at least 13 years old and have read and agree to the. Therefore, the first rock is denser, (density = 3.0) and the second rock is less dense even though it weighs more, because its density is only 2.0. Updated as of February 13th. None of these. All rights reserved. Viscous Fluids lesson — Viscosity Worksheet Answers 1 Viscosity Worksheet Answers . Definitions Page (found here). How is the viscosity of liquid related to its mobility? On earth also it is applicable. At a molecular level, viscosity is a result the interaction between … Surface energy = J m-2 Assigned: Dec 9th. The viscosity of water at 20 °C is 1.0020 millipascal seconds (which is conveniently close to one by coincidence alone). = 0.3010 + 1/100   (at 100K)   -------------(i) You're trying desperately to shake it, but to no avail. Stoke’s law was established by an English scientist Sir George G Stokes (1819-1903). The equilibrium vapor pressure is an indication of a liquid's evaporation rate. When the drop exceeds a certain size it is no longer stable and detaches itself. 3. Liquids try to reduce their surface tension and also the no of molecules at the surface.So statement I is incorrect. Statement I : Capillary action is due to surface tension. In this practical we will show you how to determine the coefficient of viscosity of water by Poiseulle’s Method. Learn about viscosity & surface tension, units of measurement with BYJU'S. 13 and 18) This sectionis based on statement I and Statement II. Viscosity of liquids decreases as the temperature rises because at high temperature, molecules have high kinetic energy and can overcome the intermolecular forces to slip past one another between the layers. So, work done = 73×10-3 x 0.10 In heavy machinery, highly viscous oils (example: grease) are used. The resistance to flow is known as the"poise"or"CGM system"and is measured in dynes. This contains 20 Multiple Choice Questions for Class 11 Test: Viscosity And Surface Tension (mcq) to study with solutions a complete question bank. The viscosity of a material determines how much effort is required to move the material at a certain rate or simply put the resistance to flow. In other words, viscosity describes a fluid’s resistance to flow. Surface tension decreases when the temperature increases because cohesive forces decrease with an increase in molecular thermal activity. Statement I : Liquids tend to have maximum number of molecules at their surface. 19 Calculation: Calculate the viscosity by the relationships: η1 η2 t1d1 t2d2 η1 is viscosity of liquid 1. η2 is viscosity of water 0.891 poise. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Drop ball test: Engineers drop a ball in a fluid and measure the time it takes the ball to travel through the fluid. The correct answer is option D Statement II : Increase in temperature and thus kinetic energy can overcome intermolecular forces of attraction. what is the difference between dynamic viscosity and kinematic viscosity? The water drop in vacuum is perfectly spherical, The shape of water drop is distorted due to action of gravity, Soaps and detergents drastically decrease the surface tension of water. What is SI unit of viscosity-coefficient? Real- life applications of liquid with low viscosity: (iv) The viscosity of paints, varnishes, and comparable household products is closely regulated so that the paints and varnishes can be applied smoothly and evenly with a brush roller. Science Binder. You can get the Quiz Answers after submitting all quiz questions. Due to increase in temperature, surface tension also increases and becomes maximum at critical temperature. Gases exhibit viscosity in the same way. How does the viscosity vary with temperature? 5 | P a g e Specific gravity of liquid (Sp. As only for log10 ƞ = 0.311, we will have eqn i correct, Q. Drop ball test: Engineers drop a ball in a fluid and measure the time it takes the ball to travel through the fluid. VISCOSITY - TEMPERATURE CHART FOR HYDROCARBON u0026amp; OTHER PRODUCTS ... u2022 Practical limit of operation DTE13 SKYDROL LD - 4 200,000 100,000 50,000 20,000 10,000 5,000 3,000 [Filename: Appendix_F.pdf] - Read File Online - Report Abuse Arrange the following in increasing order of surface tension. In gasses, viscosity increases with temperature, due to the However, this definition can be confusing when we are looking at fluids with different densities. Together with the apparent weight ratio m, the α mix can be calculated.. Sample exam questions - particle model of matter - AQA. 7) Which of the following factors are responsible for the viscous force acting on a spherical body? Asra. So, from these relations we can get, At higher velocities the flow becomes turbulent. What is the importance of dissolved oxygen? Statement I : The order of viscosities o f hexane, water and glycerol is hexane < water < glycerol. (iii) The viscosity of a few medications, such as the various liquids used to remove warts, has also been modified for easier application. The resistance to flow is known as the"poise"or"CGM system"and is measured in dynes. Viscosity questions and calculations. Estimation of FAS potentiometrically using standard K2Cr2O7solution. Area = 0.10 m2 14 2. Viscosity can be conceptualized as quantifying the internal frictional force that arises between adjacent layers of fluid that are in relative motion. Ans: In order to see the motion of the ball, the liquid must be transparent. 1. The SI unit of viscosity is the pascal second [Pa s]. Why the liquid must be transparent? Calculate the viscous force on a ball of radius 1 mm moving through a liquid of viscosity 0.2 Nsm^-2 at a speed of 0.07 m/s? Module. Viscosity is also depends on Molecular interaction, with increase in molecular attraction viscosity increases. 4 What alternate methods can measure viscosity of substances? Compared to Viscosity, Surface Tension is a simpler phenomenon. Median response time is 34 minutes and may be longer for new subjects. students definitely take this Test: Viscosity And Surface Tension exercise for a better result in the exam. The falling liquid is also a drop held together by surface tension. : 2 Title : Determination of Saybolt Viscosity Practical questions involving the use of Saybolt Viscometer: Question 1 What is the use of the thermometer in the Saybolt Viscometer? 4. Plot of log γ against log  is linear with a slope equal to n and an intercept equal to log γ0. and decide whether to allow or terminate the connection attempt. Stoke’s law was established by an English scientist Sir George G Stokes (1819-1903). Because the repeatability and reproducibility of the coating procedure are often closely linked to the coating’s viscosity, it is a key parameter to control. Why do you require laboratory temperature for viscosity determination? 11-13) This section contains a paragraph, wach describing theory, experiments, data etc. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Core practical 4Teacher sheet Use a falling-ball method to determine the viscosity of a liquid Practical activities have been safety checked but not trialled by CLEAPSS. The more viscous (or thick) a liquid is, the longer it will take for an object to move through the liquid. Ans: b. ( three OH groups). Viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. a) True, cohesive forces are intermolecular forces between like molecules and adhesive forces between unlike molecules. The higher the Thix Index value, the more shear thinning the material will be. Class 11 University. In this experiment, the viscosity of various liquids are compared. Its surface tension and not pressure 20 °C is 1.0020 millipascal seconds ( which is conveniently to... Can have a major effect on the attractive forces between unlike molecules Chemical bonding and molecular Structure - 2 Test! Molecular motion increases, intermolecular forces and weaker adhesive forces, so it distorted. A ball in a fluid increases only weakly with pressure ( White 2003. Goes everywhere Index value, the ratio of the top viscosity quizzes online, Test: of. 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