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Question

The co-efficient of real expansion γr of a liquid is 5 times the co-efficient of linear expansion of the material of the container in which the liquid is present. The ratio of the co-efficient of apparent expansion and real expansion of the liquid is:


A
5:2
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B
1:5
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C
2:5
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D
5:1
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Solution

The correct option is D 2:5
γr=γa+γg=γa+3αg .....(1)
1=γaγr+3αgγr .....(2)
γr=5αg ....(3) [given]
Substituting γr from eqn (3) into eqn (2) we get
γaγr=13αg5αg=135=25

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