Science
MediumQ. No. at-what-temperature-are-food-items-kept-fresh-in-a-refrigerator
At what temperature are food items kept fresh in a refrigerator?
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A0°C
B4°C
C10°C
D-18°C
Correct Answer: 4°CYour Answer: B
Last Updated:
The temperature maintained in a refrigerator for food preservation is scientifically significant. Option A (0°C) is incorrect — 0°C is the freezing point of water. Storing food at exactly 0°C risks freezing the food. Also, at 0°C, water has its maximum density anomaly. While 0°C slows bacterial growth significantly, the image specifically gives 4°C as the safe refrigerator temperature. Option B (4°C) is CORRECT — the image states: रेफ्रिजरेटर में खाद्य पदार्थों को ताजा रखने हेतु तापमान होना चाहिए — 4°C. The standard safe refrigerator temperature is 4°C (40°F). At this temperature, bacterial growth is significantly slowed (most bacteria grow optimally between 4°C and 60°C — the danger zone). Additionally, 4°C is significant because it is the temperature of maximum density of water (water is densest at 4°C). This is why lakes and ponds freeze from the top down — the water at the bottom remains at 4°C even when the surface freezes. Option C (10°C) is incorrect — 10°C is too warm for safe food storage. At this temperature, bacterial growth occurs rapidly. This is the temperature of a wine cooler or root cellar, not a standard refrigerator. Option D (-18°C) is incorrect — -18°C is the standard temperature for a FREEZER compartment, not the main refrigerator section. At -18°C, food freezes solid.
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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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