Why are concentric circles formed on the surface of a watch glass after water is evaporated from it?

Water evaporates in a circular fashion.

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Water contains dissolved salts that are left behind in concentric circles after evaporation.

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Water does not completely evaporate when left on a watch glass.

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Water evaporates and condenses on the watch glass to form concentric circles.

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Solution

The correct option is B
Water contains dissolved salts that are left behind in concentric circles after evaporation.

On looking at the watch glass against light, concentric rings of dissolved salts are formed on the surface after evaporation of water.

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Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojho’s answer?