Question

A glass capillary tube is lowered vertically into liquid in a vessel. Match the column. Column 1Column 2Meniscus observedLiquid level in capillary tubeA) Concave(i) AscendsB) Convex(ii) DescendsC) Flat(iii) Neither ascends nor descends

A
A(i);B(ii);C(iii)
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B
A(ii),B(i);C(iii)
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C
A(iii);B(ii);C(i)
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D
None of these.
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Solution

The correct option is A A→(i);B→(ii);C→(iii)We know, For concave meniscus, contact angle (θ) is is less than 90∘ Also, For θ<90∘, liquid level in capillary tube ascends Similarly, For convex meniscus, θ>90∘ ⇒ Liquid level in capillary tube descends. For flat meniscus, θ=90∘ ⇒ Liquid level neither ascends nor descends.

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