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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

1 Medium

1 of 1

Application +4 | -1

A rain drop of radius 0.3 mm has a terminal velocity in air = 1 m/s. The viscosity of air is

8 \times {10^{ - 5}}

poise. The viscous force on it is

View answer and explanation

Correct option: A

45.2 \times {10^{ - 4}}\,\,\mathrm{dyne}

Option A (

45.2 \times {10^{ - 4}}\,\mathrm{dyne}

) is correct because it is the viscous force calculated using Stokes' Law.

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The average mass that must be lifted by a hydraulic press is

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20 \mathrm{~cm}

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15 \mathrm{~m} / \mathrm{s}

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5 \mathrm{~m}

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=10^{-2}

poise. A liquid rises to a height of 2 cm in a capillary tube. The angle of contact between the solid and the liquid is zero. The tube is depressed more so that the top of capillary tube is only one cm above the liquid. Then the apparent angle of contact between the solid and liquid is An object weights

m_1

in a liquid of density

d_1

and that in liquid of density

d_2

m_2

. The density of th object is