JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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Application +4 | -1

An ice box made of Styrofoam (Thermal conductivity=0.01

J{m^{ - 1}}{s^{ - 1}}{K^{ - 1}}

) is used to keep liquids cool. It has a total wall area including lid of 0.8

{m^2}

and wall thickness of 0.2 cm. A bottle of water is placed in the box and filled with ice. If the outside temperature is

{30^0}

the rate flow of heat into the box is (in

J{s^{ - 1}}

)

View answer and explanation

Correct option: C

Option C (12) is correct because the rate of heat flow is calculated using the formula for thermal conductivity, resulting in 12 J/s.

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