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  4. Assertion: When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow Reason: Product of radius of meniscus and height of liquid in the capillary tube always remain constant

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Q. Assertion : When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow
Reason: Product of radius of meniscus and height of liquid in the capillary tube always remain constant

AIIMSAIIMS 2014Mechanical Properties of Fluids

Solution:

Both assertion and reason are true and reason is the correct explanation of assertion
From equation $hR=\frac{2S}{\rho g} =$ a finite constant
Hence when the tube is of insufficient length, radius of curvature of the liquid meniscus increases, so as to maintain the product $hR$ a finite constant, i.e., as $h$ decreases, $R$ increases and the liquid meniscus becomes more and more flat, but the liquid does not overflow