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Thermal Properties of Matter — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThermal Properties of Matter1 Mark
MCQ
A sphere, a cube and a thin circular plate, all of same material and same mass are 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

  1. Plate will cool fastest and sphere the slowest.

Explanation:

loss of heat on cooling is directly proportional to the following factors:

  • Temperature difference between body and surrounding.
  • Surface area exposed to surrounding.
  • Material of object We know that surface area of sphere is minimum and of circular plate is maximum. So sphere cool slowest and circular plate fastest.

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