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 Statetnents.
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.

• A. Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation for Statement-1.
• B. Statement-1 is false, Statement-2 is true.
• C. Statement-1 is true, Statement-2 is false.
• D. Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation for Statement-1.

Answer 1

Answer: (B)

Surface tension of a liquid decreases with the rise in temperture. At the boiling point of liquid, surface tension is zero.
Capillary rise $h=\frac{2Tcos\theta }{rdg}$
As surface tension $T$ decreases with rise in temperature hence capillary rise also decreases.