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

Question

Quizplus · Accepted Answer

The cube has the smallest time required for a 90% change in temperature due to its higher surface area to volume ratio compared to the sphere and cylinder, facilitating faster heat transfer.

Three Solid Objects of the Same Material and of Equal