List of top Physics Questions on Heat Transfer

A black body at $227^{\circ} C$ radiates heat at the rate of $7\, cals / cm ^{2} s$. At a temperature of $727^{\circ} C$, the rate of heat radiated in the same units will be :

A metal rod of length $10 \,cm$ and area of cross-section $2.8 \times 10^{-4} m ^{2}$ is covered with a non-conducting substance. One end of it is maintained at $80^{\circ} C$, while the other end is put in ice at $0^{\circ} C .$ It is found that $20\, gm$ of ice melts in $5\, min$. The thermal conductivity of the metal in $Js ^{-1} m ^{-1} K ^{-1}$ is (Latent heat of ice is $80 \,cal\, g ^{-1} .$ )

Two taps supply water to a container, one at the temperature of $20^{\circ}C$ at the rate of $2 \,$kg/minute and another at $80^{\circ}C$ at the rate of $1$ kg/minute. If the container gets water from the two taps simultaneously for $10$ minutes, then the temperature of water in the container is

The electric current passing through a metallic wire produces heat because of

Solids expand on heating because