KVPY SA Exam 05-Nov-2017 Question Paper

Question : 66 of 80

Marks: +1, -0

Physics

Two different liquids of same mass are kept in two identical vessels, which are placed in a freezer that extracts heat from them at the same rate causing each liquid to transform into a solid. The schematic figure below shows the temperature T vs time t plot for the two materials. We denote the specific heat in the liquid status to be C

_{L1}

and C

_{L2}

for materials 1 and 2 respectively, and latent heats of fusion U

_1

and U

_2

respectively.

Choose the correct option.

$C_{L1} > C_{L2} \and U_1< U_2$
$C_{L1} > C_{L2 }\and U_1 > U_2$
$C_{L1}< C_{L2} and U_1> U_2$
$C_{L1} < C_{L2} and U_1 < U_2$

Validate

Solution:

Let Refrigerater extract Q joul/per second

Q.t ⇒ ms (T_\f -T)

Higher the specific heat, Higher the slope

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