*$_Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500¬¨‚àûC 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?

*$_Three solid objects of the same material and of equal mass-a sphere

1.	*$_Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500¬¨‚àûC 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» B. Cylinder