JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

1 Medium

1 of 1

Application +4 | -1

Water rises up in a glass capillary upto a height of

9.0 \mathrm{~cm}

, while mercury falls down by

3.4 \mathrm{~cm}

in the same capillary. Assume angles of contact for water-glass and mercury-glass as

0^{\circ}

and

135^{\circ}

respectively. Determine the ratio of surface tensions of mercury and water. Take

\cos 135^{\circ}=-0.71.

View answer and explanation

Correct option: A

7.2: 1

Option A (

7.2: 1

) is correct because it is the ratio of surface tensions calculated using the capillary rise formula, considering the different heights, densities, and contact angles.

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