High School

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When a capillary tube is dipped in water, irrespective of the length of the tube, water cannot come out of the tube due to:

a) Viscosity
b) Surface tension
c) Gravity
d) Capillary action

Answer :

Final answer:

Water cannot come out of a capillary tube due to capillary action, which is the ability of a liquid to rise in a narrow space against gravity, caused by adhesive forces. Hence, d is the correct option.

Explanation:

When a capillary tube is dipped in water, the water cannot come out of the tube due to capillary action. Capillary action is a phenomenon where liquid climbs up against gravity in a small-diameter tube. It occurs because the adhesive forces between the liquid (such as water) and the tube materials are stronger than the cohesive forces within the liquid itself. This results in the liquid creeping up inside the tube until the weight of the liquid is balanced by the adhesive forces. The smaller the tube's diameter, the higher the liquid climbs. Factors like the tube's diameter, the temperature of the liquid, and the liquid's density influence the height the liquid can reach. Importantly, the capillary effect does not depend on the angle at which the tube is tilted.

In this case, the phenomena driving this behavior are stronger than those offered by options b) surface tension and c) gravity and are not hindered by a) viscosity. Therefore, the only correct answer is d) capillary action.

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Rewritten by : Barada