JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Understanding +4 | -1

Water rises to a height

\mathrm{h'}

in capillary tube. If the length of capillary tube above the surface of water is made less than

\mathrm{h'}

then:

View answer and explanation

Correct option: C

Water rises upto the top of capillary tube and stays there without overflowing

Option C (Water rises upto the top of capillary tube and stays there without overflowing) is correct because the water will rise to the top and adjust its radius of curvature to maintain equilibrium without overflowing.

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

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20 \mathrm{~cm}

with separation of

0.5 \mathrm{~cm}

. The work done to increase the separation by

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

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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