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    Question

    The use of Stokes’ law for measurement of the size of

    soil particle depends on certain simplifying assumptions. These are: A. Particles must be spherical, smooth and rigid B. Fall must be unhindered C. Particles must be uniform density D. Size of particles must be small compared to the size of molecules of liquid Choose the correct answer from the options given below:
    A A, B and D only Correct Answer Incorrect Answer
    B A, B and C only Correct Answer Incorrect Answer
    C A, C and D only Correct Answer Incorrect Answer
    D B, C and D only Correct Answer Incorrect Answer

    Solution

    Stokes' law is used for the measurement of particle size in soil, and it relies on certain simplifying assumptions. These assumptions are: A. Particles must be spherical, smooth, and rigid: This assumption is necessary for the calculation of the drag force acting on the particles. B. Fall must be unhindered: Stokes' law assumes that the particles are freely falling through a liquid medium without any obstructions or interference from other particles. D. Size of particles must be small compared to the size of molecules of the liquid: This assumption ensures that the motion of the particles is primarily influenced by viscous drag forces rather than other forces, such as inertial forces.

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