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Question 30979
JEE Physics · Hard

Fluid Mechanics: Viscosity MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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ViscosityHardQuestion 30979

Question

Reynolds number for a sphere of diameter D falling through fluid at speed v:
  1. A
    ρvD/η
    Correct
  2. B
    ρvD²/η
  3. C
    ηv/(ρD)
  4. D
    ρD/(ηv)

Correct answer

ρvD/η

Explanation

Re = ρvL/η where L is the characteristic length (diameter for a sphere).

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