Practice question
Question
What is the heat required to raise the temperature of 0.5kg of copper from 30∘C to 80∘C? (Specific heat of copper = 386J kg−1K−1)
Explanation
Given: m = 0.5kg, ΔT = 80−30 = 50∘C, s = 386Jkg−1K−1. Q = msΔT = 0.5×386×50 = 9650J = 9.65kJ. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 9.65 kJ. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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