MCQ
Work done by a frictional force is
- ANegative
- BPositive
- CZero
- ✓All of the above
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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.

