Select the correct statements?
I) Increase in relative humidity decreases the density of air
II) Increase in relative humidity decreases the rate of evaporation of water
III) Increase in relative humidity decreases the velocity of sound
IV) Increase in relative humidity increases the velocity of sound

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I,II,IV

I,II,III

I,II

I,IV

answer is A.

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Detailed Solution

●        Humidity, or the amount of moisture in the air, is a key component of climate. When the word "humidity" is used alone, it usually refers to relative humidity, which is the ratio of the air's actual water-vapour content to its total capacity at the specified temperature.
●        Absolute humidity is the mass of water vapour per unit volume of natural air.
●        A hygrometer is used to measure humidity. As the air's moisture content rises and gets closer to saturation, the rate of evaporation falls.
●        The speed very slightly increases when the air's humidity level rises.The speed of sound in air is often measured in dry air without taking into account the effect of humidity because humidity can fluctuate so much and the amount of change in speed with an extreme shift in humidity is less than 0.5 percent.
●        Density is influenced by the air's water vapour content.
●        Compared to the two main gases that make up air, diatomic Oxygen and diatomic Nitrogen, water vapour is a relatively light gas.
●        When the amount of water vapour in the moist air increases, the density drops because the mass is dwindling and the amount of oxygen and nitrogen per unit volume declines.

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