Blackboard dries up after wiping it with water. This is because of phenomenon X. The droplets on the outer surface of the cold glass are due to phenomenon Y. Which one of the following is correct?

X and Y are same phenomenon.

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X and Y together results in water cycle.

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X and Y both determines level of water on earth.

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X and Y are chemical processes.

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Solution

The correct options are
B
X and Y together results in water cycle.

C
X and Y both determines level of water on earth.

Drying of water from blackboard is due to evaporation and deposition of water droplets on a cold water glass surface is due to condensation. So, in the given statement, X is evaporation and Y is condensation. Both of these are physical phenomena. Together they result in the water cycle.

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Similar questions

Puddles of rainwater get dried under the sun because of phenomenon X. The formation of water droplets on the outer surface of a glass of cold water is due to phenomenon Y. Which cycle are these phenomena a part of?

Water spilled on the floor vanishes after some time even when left unattended. This is because of phenomenon X.The formation of droplets on the outer surface of a glass tumbler containing cold water is due to phenomenon Y. Which one of the following is correct?

State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.

(b) Steam rising from wet clothes while they are ironed.

(d) Blackboard dries up after wiping it.

(e) Steam rising from a hot girdle when water is sprinkled on it.

State for each of the following whether it is due to evaporation or condensation :
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.

When cold water is kept in a glass, small droplets are formed on the surface of the glass after a while. How does this happen? What is this phenomenon called? Can the reverse of this phenomenon happen? If so, what is that process called? Explain with an example. [5 MARKS]

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