This question has Statement-I and Statement-2. Of the four ch.oic… - Vidyadip

MCQ

This question has Statement-I and Statement-2. Of the four ch.oices 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 Statemer $- 1$
✓
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

Correct option: B.

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

b
Surface tension of a liquid decreases with the rise in temperture. At the boiling point of liquid, surface tension is zero.

$Capillary\,rise\,h = \frac{{2T\cos \theta }}{{rdg}}$

As surface tension $T$ decreases with rise in temperature hence capillary rise also decreases.

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