It is known that wax contracts on solidification. If molten wax is taken in a large vessel and i...

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It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly, then
[CBSE PMT 1994]
(a) It will start solidifying from the top to downward
(b) It will start solidifying from the bottom to upward
(c) It will start solidifying from the middle, upward and downward at equal rates
(d) The whole mass will solidify simultaneously
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