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(i) Water drops on two surfaces A and B ...

(i) Water drops on two surfaces A and B has been shown in figure. Which surface is hydrophobic and which surface is hydrophilic?

(ii) A liquid is filled in a spherical container of radius R till a height h. In this position the liquid surface at the edges is also horizontal. What is the contact angle between the liquid and the container wall?

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The correct Answer is:
(1) `A rightarrow hydrophilic`
`B rightarrow hydrophobic`
(2) `cos^(-1)((R-h)/R)`
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