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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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An electrical heating coil was placed in a calorimeter containing 360gm360 \mathrm{gm} of water at 10∘C10^{\circ} \mathrm{C}. The coil expand energy at the rate of 90 watt. The water equivalent of the calorimeter and the coil is 40gm\mathbf{4 0} \mathrm{gm}. Calculate what will be the temperature of water after 10 minutes. [J = 4.2 Joules/cal.]
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Correct option: A
θ=42.14∘C\theta=42.14^{\circ} \mathrm{C}
Option A (θ=42.14∘C\theta=42.14^{\circ} \mathrm{C}) is correct because it accurately calculates the final temperature of the water after 10 minutes using the given power and heat capacity.

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