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A liquid is contained in a graduated con...

A liquid is contained in a graduated container such that reading of level of liquid is observed to be `500ml` at `20^(0)C` When their temperature is increased `70^(0)C` ,reading obtained is `500ml` again. If `gamma` is the thermal coefficient of cubical expansion of the liquid and `alpha` is the thermal coefficient of linear expansion of container then
(A) `gamma>3 alpha`
(B) `gamma=3 alpha`
(C) `gamma<3 alpha`
(D) `gamma=2 alpha`

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