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Question

The steps involved in the formation of dew are given below. Arrange them in a proper sequence.
(A) On further lowered in temperature, water vapour condenses.
(B) During day time water from water bodies gets evaporated.
(C) Temperature falls during night time, and hence the air becomes saturated with water vapour.


A

CBA

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B

CAB

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C

BCA

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D

ACB

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Solution

The correct option is C

BCA


Explanation for correct option:

  • Dew is the formation of small water droplets on the surface of objects such as cars and plant leaves on cold winter mornings. It happens more frequently when the weather has been foggy, i.e. the air has been saturated with water vapour the night before.
  • Dew is the small droplets of water that form on the surfaces of cold objects such as cars and leaves on winter mornings. Dew forms when water vapour in the surrounding air comes into contact with a cold surface and transfers heat to it.
  • This heat loss causes water vapour to condensate into water droplets on the surfaces of the objects. As a result, the formation of dew is an example of condensation. So, the step involved in the formation of dew is BCA.

Conclusion: Hence, the correct option is C.


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