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10.1, thermonetry,thermal expansion and calorimetry — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics10.1, thermonetry,thermal expansion and calorimetry1 Mark
MCQ
A cuboid $ABCDEFGH$ is anisotropic with $\alpha_x = 1 × 10^{-5} /^o C$, $\alpha_y = 2 × 10^{-5} /^o C$, $\alpha_z = 3 × 10^{-5} /^o C$. Coefficient of superficial expansion of faces can be
  • A
    $\beta_{ABCD} = 5 × 10^{-5} /^o C$
  • B
    $\beta_{BCGH} = 4 × 10^{-5} /^o C$
  • ✓
    $\beta_{CDEH} = 3 × 10^{-5} /^o C$
  • D
    $\beta_{EFGH} = 2 × 10^{-5} /^o C$
✓

Answer

Correct option: C.
$\beta_{CDEH} = 3 × 10^{-5} /^o C$
c
Coefficient of superficial expansion of face $\mathrm{CDEH}=\alpha_{x}+\alpha_{y}=3 \times 10^{-5} /^{\circ} \mathrm{C}$

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