Virtual Labs

Determination of percentage composition of sugar solution from viscosity measurement

What is an Ostwald viscometer

a: a U-shaped glass tube with markings on two bulbs Explanation

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b: A vertical glass tube with gradations and a dense sphere that can fall in the the tube. Explanation

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c: A vertical glass tube with gradations and a pressure controlled pump Explanation

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d: A pressure contolled pump connected to a horizontal glass tube. Explanation

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Viscosity coefficient is defined

a: the force required to lift a unit volume of liquid in a capillary tube. Explanation

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b: the ratio of shear stress to shear strain in a liquid. Explanation

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c: the tangential force per unit area needed to maintain a unit velocity gradient between layers of a liquid. Explanation

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d: the resistance of a liquid to flow due to its density Explanation

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The Ostwald viscometer is used t to determine the concentration of an unknown sugar solution by comparing the ____________ of the unknown sugar solution with that of a known sugar solution

a: weight Explanation

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b: volume Explanation

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c: flow time and density Explanation

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d: pH Explanation

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How is the flow pressure calculated for a liquid of known density ?

a: Using the height difference of liquid columns in the two arms of the U-tube Explanation

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b: Using a pressure sensor connected to the arms of the U-tube Explanation

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c: Using the temperature and volume of the liquid Explanation

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d: By measuring the time taken for the liquid to flow Explanation

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For a U-tube viscometer, wWhat is the relation between the viscosity and the density of a liquid?

a: Viscosity is inversely proportional to the density Explanation

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b: Viscosity and density are independent of each other Explanation

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c: Viscosity is directly proportional to the density Explanation

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d: Viscosity is proportional to the square root of the density Explanation

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