WB JEE 2016 | Heat and Thermodynamics Question 40 | Physics

WB JEE 2016

MCQ (Single Correct Answer)

-0.25

The temperature of the water of a pond is 0$$^\circ$$C while that of the surrounding atmosphere is $$-$$20$$^\circ$$C. If the density of ice is $$\rho$$, coefficient of thermal conductivity is k and latent heat of melting is L, then the thickness Z of ice layer formed increases as a function of time t is

$${Z^2} = {{60k} \over {\rho L}}t$$

$$Z = \sqrt {{{40k} \over {\rho L}}} t$$

$${Z^2} = {{40k} \over {\rho L}}\sqrt t $$

$${Z^2} = {{40k} \over {\rho L}}t$$

WB JEE 2016

MCQ (Single Correct Answer)

-0.5

The temperature of a blackbody radiation enclosed in a container of volume V is increased from 100$$^\circ$$C to 1000$$^\circ$$C. The heat required in the process is

4.79 $$ \times $$ 10^$$-$$4 cal

921 $$ \times $$ 10^$$-$$5 cal

2.17 $$ \times $$ 10^$$-$$4 cal

None

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