Two large holes are cut in a metal sheet. If this is heated, distances $AB$ and $BC$, (as shown)
both will increase
both will decrease
$AB$ increases, $BC$ decreases
$AB$ decreases, $BC$ increases
It takes $10$ minutes to cool a liquid from $61^{\circ} C$ to $59^{\circ} C$. If room temperature is $30^{\circ} C$ then time taken in cooling from $51^{\circ} C$ to $49^{\circ} C$ is .......... $min$
The adjoining diagram shows the spectral energy density distribution $E_\lambda $ of a black body at two different temperatures. If the areas under the curves are in the ratio $16 : 1$, the value of temperature $T$ is ......... $K$
Two identical conducting rods are first connected independently to two vessels, one containing water at $100^o\ C$ and the other containing ice at $0^o\ C$. In the second case, the rods are joined end to end and connected to the same vessels. Let $q_1$ and $q_2\ g/s$ be the rate of melting of ice in the two cases respectively. The ratio $q_2/q_1$ is
The ratio of thermal conductivity of two rods of different materials is $5 : 4$. The two rods of same area and same thermal resistance will have lengths is the ratio
Two rods of same length and material transfer a given amount of heat in $12\,s,$ when they are joined end to end. But when they are joined lengthwise, then they will transfer same heat in same conditions in .......... $\sec$