Statement-1: A capillary is dipped in a liquid and liquid rises to a height h in it. As the temperature of the liquid is raised, the height h increases (if the density of the liquid and the angle of contact remain the same).

Question

This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement-1: A capillary is dipped in a liquid and liquid rises to a height h in it. As the temperature of the liquid is raised, the height h increases (if the density of the liquid and the angle of contact remain the same).

Statement-2: Surface tension of a liquid decreases with the rise in its temperature.

Smart Achievers · Accepted Answer

(2)

Surface tension of a liquid decreases with the rise in temperature. At the boiling point of liquid, surface tension is zero. Capillary rise $h = \frac{2 T \cos θ}{r d g}$

As surface tension T decreases with rise in temperature

hence capillary rise also decreases

Solution

1 Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation for Statement-1.

2 Statement-1 is false, Statement-2 is true.

3 Statement-1 is true, Statement-2 is false.

4 Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation for Statement-1.

Ans.
(2)

Surface tension of a liquid decreases with the rise in temperature. At the boiling point of liquid, surface tension is zero. Capillary rise $h = \frac{2 T \cos θ}{r d g}$

As surface tension T decreases with rise in temperature

hence capillary rise also decreases

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