Multiple choice

What happens when moist air comes in contact with a cold surface?

  1. Water vapour present in the air condenses and drops of water appear on the cold surface.

  2. The water vapour in the air condenses and a small cloud forms.

  3. The particulate matter suspended in the air settles down as the air around the surface contracts.

  4. No visible effect is observed.
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A Correct answer
Explanation

The water vapour present in the air condenses and drops of water appear on the cold surface.

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