Multiple choice

On cloudy nights very little dew is formed. The reason for this is that

  1. on cloudy nights the radiation occurs very slowly

  2. clouds absorb the falling dew

  3. clouds scatter moisture

  4. all the above
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A Correct answer
Explanation

Dew forms when the surface temperature drops below the dew point due to radiative cooling. On cloudy nights, clouds act as a blanket, reflecting thermal radiation back to the surface and preventing the rapid cooling necessary for dew formation.

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