Question

on a hot sunny day why do we sprinkle water onthe roof or open ground

Answer 1

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On a hot sunny day, we sprinkle water. The water, to evaporate, absorbs its latent heat of vapourization from the surroundings, I.e., 1 gram of the water (which you pour) absorbs 2268J heat from the surroundings to evaporate, which makes the surrounding a bit cooler.

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Answer 2

On a hot sunny day we sprinkle water to make our house cool as the water droplets evaporate they use the latent heat of vaporisation and make our house cool