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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Physics
Chapter
Mechanical Properties of Fluids

BITSAT 2012 · Physics · Mechanical Properties of Fluids

A large drop of oil (density 0.8 g / cm^ 3 and viscosity _ 0 )...

A large drop of oil (density 0.8g/cm30.8 \mathrm{ g} / \mathrm{cm}^{3} and viscosity η0\eta_{0} ) floats up through a column of another liquid (density 1.2g/cm31.2 \mathrm{ g} / \mathrm{cm}^{3} and viscosity ηL\eta_{\mathrm{L}} ). Assuming that the two liquids do not mix, the velocity with which the oil drop rises will depend on:

Options

  1. Aη0\eta_{0} only
  2. BηL\eta_{L} only
  3. Cboth on η0\eta_{0} and ηL\eta_{\mathrm{L}}
  4. Dneither η0\eta_{0} nor ηL\eta_{L}

Correct answer

B. ηL\eta_{L} only

Step-by-step solution

Forces of viscosity arise in a fluid when different sections of the fluid move with different velocities. Here, there is no such motion inside the oil drop and hence the viscosity of oil does not come into play.
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