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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
Options:
A .  cube
B .  cylinder
C .  sphere
D .  equal for all the three
Answer: Option A
Answer: (a).cube

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