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Air bubble rising steadily through a solution: coefficient of viscosity of the solution

The same question, asked 3 times: 28 Jul 2022*, 8 Apr 2023*, 2 Apr 2026 S2. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    28 Jul 2022

    28
    The diameter of an air bubble which was initially 2 mm2\text{ }mm, rises steadily through a solution of density 1750 kg m−31750\text{ }kg{\text{ }m}^{- 3} at the rate of 0.35cms−10.35cms^{- 1}. The coefficient of viscosity of the solution is ____\_\_\_\_ poise (in nearest integer). (the density of air is negligible).

  2. Question 2

    8 Apr 2023

    26
    An air bubble of diameter 6 mm6\text{ }mm rises steadily through a solution of density 1750 kg/m31750\text{ }kg/m^{3} at the rate of 0.35 cm/s0.35\text{ }cm/s. The co-efficient of viscosity of the solution (neglect density of air) is____ Pas (given, g=10 ms−2g = 10{\text{ }ms}^{- 2} )

  3. Question 3

    2 Apr 2026 S2

    10
    If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg/m32000\text{ }kg/m^{3} at a rate of 0.5 cm/s0.5\text{ }cm/s, then the coefficient of viscosity of liquid is ____\_\_\_\_ Poise. (Take g=10 m/s2g = 10\text{ }m/s^{2} )

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