Physics - Heat & Thermo Question with Solution | TestHub
Column I shows some heat conductors of various shapes. Column II shows certain parameters related with heat transfer. Match the column I with column II. Note that comparison is to be made in direction of heat flow and in steady state. In all the figures the surfaces shown in dotted are isothermal surfaces.
Column I | Column II |
|---|---|
(A) Tapering rod, well insulated. Hot reservoir to cold reservoir. | (P) Modulus of temperature gradient increases as we move from higher to lower temperature. |
(B) Hollow cylindrical conductor around hot liquid; flat faces thermally insulating, outside at low temperature. | (Q) Rate of heat transfer across the dotted surfaces is constant. |
(C) Hollow spherical conductor around hot liquid, outside at low temperature. | (R) Modulus of temperature gradient decreases as we move from higher to lower temperature. |
| (S) Rate of heat transfer across the dotted surfaces is variable. |
Options:
Answer:
Solution:
In A : Area is decreasing In B and C : Area "A" is increasing. Hence the result.
