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STD 11 - 10.2. transmission of heat — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 10.2. transmission of heat4 Marks
MCQ
A solid cube and a solid sphere of identical material and equal masses are heated to the same temperature and left to cool in the same surroundings. Then,
  • A
    the cube will cool faster because of its sharp edges
  • ✓
    the cube will cool faster because it has a larger surface area
  • C
    the sphere will cool faster because it is smooth
  • D
    the sphere will cool faster because it has a larger surface area
✓

Answer

Correct option: B.
the cube will cool faster because it has a larger surface area
b
(b)

Area of cube is more than that of a sphere for same mass and density.

Cube also have sharp edges that radiates more effectively than a flat surface.

So, rate of cooling for cube is much rapid than sphere. Effect of sharp edges is prominent only at very high

temperatures. So, option $(b)$ is correct.

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