Thermal Propert...

Surface of the lake is at 2^oC. Find the temperature of the bottom of the lake

The heat is flowing through a rod of length 50 cm and are of cross-section 5 cm². Its ends are respectively at 25^oC and 125^oC. The coefficient of thermal conductivity of the material of the rod is 0.0092 kcal/m × s × ^oC. The temperature gradient in the rod is

In the Ingen Hauz\'s experiment the wax melts up to lengths 10 and 25 cm on two identical rods of different materials. The ratio of thermal conductivities of the two materials is

Heat current is maximum in which of the following (rods are of identical dimension)?

Two rods of same length and cross-section are joined along the length. Thermal conductivities of first and second rod are K₁ and K₂. The temperature of the free ends of the first and second rods are maintained at θ₁ and θ ₂ respectively. The temperature of the common junction is

The freezer in a refrigerator is located at the top section so that

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that

For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

Mode of transmission of heat, in which heat is carried by the moving particles, is

When fluids are heated fro the bottom, convection currents are produced because