Woollen clothes are used in winter season because woolen clothes

  • [AIIMS 1998]
  • A

    Are good sources for producing heat

  • B

    Absorb heat from surroundings

  • C

    Are bad conductors of heat

  • D

    Provide heat to body continuously

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  • [AIPMT 2010]

Four rods of silver, copper, brass and wood are of same shape. They are heated together after wrapping a paper on it, the paper will burn first on

One end of a thermally insulated rod is kept at a temperature $T_1$ and the other at $T_2$. The rod is composed of two sections of lengths $l_1$ and $l_2$ and thermal conductivities $K_1$ and $K_2$ respectively. The temperature at the interface of the two sections is

Two metallic blocks $M_{1}$ and $M_{2}$ of same area of cross-section are connected to each other (as shown in figure). If the thermal conductivity of $M _{2}$ is $K$ then the thermal conductivity of $M _{1}$ will be ]...............$K$ [Assume steady state heat conduction]

  • [JEE MAIN 2022]