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JEE Main 2008 (AIEEE) · Angle of Contact & Capillarity

Angle of Contact & Capillarity question from JEE Main 2008 (AIEEE)

Q69JEE Main 2008 · AIEEEEasy

Angle of Contact & Capillarity

A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

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Answer: (c)

Soap lowers the surface tension of water, and $h \propto T$ .
Both liquids wet glass ( $\theta < 90^\circ$ ), so both menisci are concave and both columns rise.
Tube B (soap solution) shows a smaller rise than tube A.
So the answer is (c).

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