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Air conditioners are comprehensive climate control systems. Option A is wrong. Air conditioners have no mechanism to control the color of light in a room. Light color is controlled by lighting systems completely separate from HVAC (Heating Ventilation Air Conditioning) systems. Option B is CORRECT. The image states: एयरकंडीशनर आर्द्रता नियंत्रित करता है. An air conditioner controls humidity through the following mechanism: When warm humid air passes over the cold evaporator coils (which are below the dew point temperature) moisture from the air condenses on the coils and drips into a drain pan. This removes water vapor from the air reducing the humidity (relative humidity) of the room. This dehumidification is a key function of air conditioners. This is why AC rooms feel dry and a glass of water placed in AC room may stay cool longer. This is also why people with joint problems sometimes feel discomfort in heavily air conditioned rooms (dry air). Option C is wrong. Air conditioners do not control CO2 levels. CO2 management requires ventilation systems that exchange indoor and outdoor air or CO2 scrubbers. In fact a sealed AC room can have rising CO2 levels without proper ventilation. Option D is wrong. Air conditioners do not add or remove oxygen. They simply cool and dehumidify the existing air by recirculating it.
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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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