If it takes $7 \, h$ to form a $1 \, cm$ thick layer of ice on a pond at $0^o C$,how many hours will it take for the thickness of the ice layer to increase from $1 \, cm$ to $2 \, cm$?

Heat flows through a long metallic rod from one end to the other under steady-state conditions. The variation of temperature $\theta$ with distance $x$ from the hot end is shown in which of the following graphs?

Snow is more heat insulating than ice,because

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

$A$ piece of glass is heated to a high temperature and then allowed to cool. If it cracks,a probable reason for this is the following property of glass:

When the two ends of a metal rod are maintained at different temperatures and after some time every point of the rod attains a constant temperature,then: