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The refrigerator is an essential household appliance working on thermodynamic principles. Option A (To freeze all food items) is incorrect — a regular refrigerator does NOT freeze food items. Freezing occurs only in the freezer compartment (typically at -18°C or below). The main refrigerator compartment maintains temperatures above 0°C (usually 2-8°C) to preserve food without freezing. Option B (To maintain a uniform low temperature) is CORRECT — the image states: रेफ्रिजरेटर में थर्मोस्टेट का कार्य होता है — एक समान तापमान को बनाए रखना. The refrigerator's primary function is to maintain a uniformly low temperature inside to slow down bacterial growth and food spoilage. It uses a refrigerant (CFC in domestic models, ammonia in large cold storage) that absorbs heat from inside and releases it outside through a thermodynamic cycle involving evaporation and condensation. Option C (To kill bacteria using high heat) is incorrect — refrigerators use LOW temperature to slow bacterial activity, not high heat to kill bacteria. Pasteurization and autoclaving use high heat to kill bacteria, not refrigeration. Option D (To purify air inside) is incorrect — refrigerators do not purify air. They simply reduce temperature to preserve food. Some modern refrigerators have air purifiers but this is not the primary function.
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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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