Woollen clothes are used in winter season because woolen clothes

What is thermal steady state?

Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?

The radius of a conductor increases uniformly from the left end to the right end as shown in the figure. The material of the conductor is isotropic,and its curved surface is thermally isolated from the surroundings. Its ends are maintained at temperatures $T_1$ and $T_2$ $(T_1 > T_2)$. If,in a steady state,the heat flow rate is equal to $H$,then which of the following graphs is correct?

$Assertion :$ Woolen clothes keep the body warm in winter.
$Reason :$ Air is a bad conductor of heat.

The temperature of the hot and cold ends of a $20 \ cm$ long rod in a thermal steady state are at $100^\circ C$ and $20^\circ C$ respectively. The temperature at the centre of the rod is ...... $^\circ C$.