Three solid objects of the same material and of equal mass-a...

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Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

A. Cube

B. Cylinder

C. Sphere

D. Equal for all the three

Answer: Option A

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