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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Question 10

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?

(a) Evaporation of water from the glass.

(b) Water that seeped out from the glass.

(d) Condensation of atmospheric water vapour.

Question 3

(i) What do you mean by evaporation?

(ii) Why do we see water droplets on the outer surface of a glass containing ice-cold water?

Q. A rock formed after evaporation of water is __________.

Q. What is the process where water evaporates from the surface, condenses to form clouds, and precipitates on the ground as rain called?

Q. When water containing dissolved salts evaporate there is formation of layer of

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

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.

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.