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A cylindrical blind riser with diameter d and height h , is placed on the top of the mold cavity of a closed type san d mold as shown in the figure. If the riser is of constant volume, then the rate of solidification in the riser is the least when the ratio h:d is

  1. $1:2$
  2. $2:1$
  3. $1:4$
  4. $4:1$
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