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Question

When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 140. When the tube is dipped with an inclination of 40, the angle of contact is:

A
100
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B
140
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C
180
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D
60
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Solution

The correct option is B 140
Angle of contact is a characteristic property of the interaction of a liquid with the surface in contact. It is the property of the interface formed between two phases (eg: solid & liquid).

Value of angle of contact is governed by the properties of the materials at the contact.
Hence, it does not depend on the inclination of the capillary tube.
i.e here, contact angle will be 140 only.

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