When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary.

Monjur Alahi

When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary.
(a) The surface tension of the liquid must be zero.
(b) The contact angle must be 90°.
(c) The surface tension may be zero.
(d) The contact angle may be 90°.


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Salim Ahmed Kawsar

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(c) The surface tension may be zero.

(d) The contact angle may be 90°.

Explanation: 

The rise in a capillary tube is given as, h = 2S.cosθ/rρg The capillary tube has a certain inner radius r. So r, ρ and g are not zero. For h to be zero either surface tension S may be zero or the contact angle θ = 90° so that cosθ = 0. But we can not conclude that S must be zero or θ must be 90°. Hence the option (c) and (d) are true.

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