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Air coolers and air conditioners differ fundamentally in what they control. Option A is wrong — air cooler does NOT control humidity like an AC. In fact an air cooler INCREASES humidity because it evaporates water into the air. An AC DECREASES humidity by condensing moisture on evaporator coils. Option B is CORRECT — the image states: एयरकूलर आर्द्रता को नियंत्रित नहीं करता है. An air cooler controls air speed (fan speed) but does NOT control temperature directly the way an AC does. An air cooler cools air by evaporating water (evaporative cooling) which lowers temperature somewhat but cannot achieve precise temperature control. It increases air movement but true temperature regulation is absent. Air conditioner controls both temperature and air speed precisely. Option C is wrong — unlike an AC an air cooler cannot precisely control temperature. It cools by evaporation only and cannot lower temperature to a set precise value in humid conditions. Option D is wrong — air cooler definitely controls air speed (it has a fan). It does not control humidity — it actually increases humidity.
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
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