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Class 11 Physics Practice Test: Mechanical Properties of Fluids - Viscosity
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Viscosity is the resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow.

Class 11 Physics Practice Test: Mechanical Properties of Fluids - Viscosity
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10 Questions

1. 1 poise = _________ Ns/m2. Fill in the blanks.
2. On which these factors does air/fluid resistance force, acting on a spherical body, not depend?
3. The coefficient of viscosity is equal to the ratio of shear stress to shear strain. True or False?
4. Viscosity is said to be internal friction between fluid layers. What type of force is it?
5. What will be the terminal velocity of a rain drop of radius (r) 1mm and mass (M) 0.001g falling through air. The coefficient of viscosity of air (η) is 1.8 X 10-5Ns/m2? Neglect buoyant force.
6. In a closed pipe of radius R, fluid (having some viscosity) is flowing laminarly. Which point along a cross section will have maximum speed?
7. What is the unit of coefficient of viscosity?
8. A block of mass 2kg is going down an incline over a fluid having some viscosity. The block moves with a constant speed of 5m/s. Assuming that the temperature of fluid remains constant, find the coefficient of viscosity of the fluid. Angle of incline is 30° & block is a cube of side 1m. Also given that the thickness of fluid is 1cm.
9. Coefficient of viscosity doesn’t depend on temperature because it is a property of the fluid. True or False?
10. What is the effect of temperature increase on viscosity of liquids and gases?

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