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10.2 , transmission of heat — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics10.2 , transmission of heat1 Mark
MCQ
In variable state, the rate of flow of heat is controlled by
  • A
    Density of material
  • B
    Specific heat
  • C
    Thermal conductivity
  • ✓
    All the above factors
✓

Answer

Correct option: D.
All the above factors
d
(d)In variable state $\frac{Q}{t} \propto K$ and $\frac{Q}{t} \propto \frac{1}{{\rho \,c}}$==> $\frac{Q}{t} \propto \frac{K}{{\rho \,c}}$
 ( $K$ = thermal conductivity, $\rho$ = density, $c$ = specific heat)

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