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Q.

An ice box made of styrofoam (thermal conductivity= 0.01 Jm-1 s-1K-1) is used to keep liquids cool. It has a total wall area including lid of 0.8 m2 and wall thickness of 2.0 cm. A
bottle of water is placed in the box and filled with ice. If the outside temperature is 30°C the rate of flow of heat into the box is: (in Js-1)

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a

16

b

12

c

10

d

14

answer is C.

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Detailed Solution

 dQdt=kA(T1-T2)l =0.01×0.830∘−0∘2×10−2=12 J−s−1

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