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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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A piece of metal weighs 46 g46 \mathrm{~g} in air. When immersed in a liquid of specific gravity 1.241.24 at 27∘C27^{\circ} \mathrm{C} it weighs 30 g30 \mathrm{~g}. When the temperature of liquid is raised to 42∘C42^{\circ} \mathrm{C} the metal piece weighs 30.5 g30.5 \mathrm{~g}. Specific gravity of liquid at 42∘C42{ }^{\circ} \mathrm{C} is 1.20.1.20. Calculate the coefficient of linear expansion of metal
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Correct option: A
2.23×10−5∘C−12.23 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1}
Option A (2.23×10−5∘C−12.23 \times 10^{-5} { }^{\circ} \mathrm{C}^{-1}) is correct because it is the coefficient of linear expansion calculated using the change in weight and specific gravity of the metal piece in the liquid.

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