question_answer 30)

                  A sphere, a cube and a thin circular plate all of same material and same mass arc initially heated to same high temperature.                 (a) Plate will cool fastest and cube the slowest                 (b) Sphere will cool fastest and cube the slowest                 (c) Plate will cool fastest and sphere the slowest                 (d) Cube will cool fastest and plate the slowest.                

Answer:

                  (c) Rate of loss of heat from a body is directly proportional to the surface area of the body circular.