Assertion (A) states that ice collection on a freezer adversely affects cooling. This is true because ice acts as an insulator, impeding the transfer of cold from the cooling coils to the interior of the freezer. Reason (R) states that ice is a poor conductor. This is also true; ice is a relatively poor thermal conductor compared to the materials typically used for freezer walls and cooling coils.
Consider the following statements: Assertion (A): If Ice collects on the freeze the cooling in the refrigerator is affected adversely. Reason (R) : Ice is a poor conductor. Select the correct answer using the codes given below: Codes:
Asked in UPPCS Prelims 2010 · Topic: Conductivity (Thermal Conductivity: Mechanisms and Wiedemann-Franz Law)
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Answer: A. Both (A) and (R) are true and (R) is the correct explanation of (A).
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