
Is steel is a good conductor of heat?
Important Questions on Thermal Properties of Matter


A metallic prong consists of rods made of the same material, cross-section, and same lengths as shown.
The three forked ends are kept at and the handle end is at The temperature of the junction is



“The constituent particles of a material change position during conduction of heat through it.”



Consider a ball of mass attached to one end of a spring and immersed in water. Assume the complete system is in thermal equilibrium. The spring is now stretched to and the mass is released so that it vibrates up and down. Estimate the change in temperature of water before the vibrations stop.
(Specific heat of the material of the ball and Specific heat of water )

As per the given figure, two plates and of thermal conductivity and are joined together to form a compound plate. The thickness of plates are and respectively and the area of cross-section is for each plate. The equivalent thermal conductivity of the compound plate is , then the value of will be _____ .

If and are the thermal conductivities and are the lengths and and are the cross sectional areas of steel and copper rods respectively such that . Then, for the arrangement as shown in the figure. The value of temperature of the steel - copper junction in the steady state will be

Three rods of identical cross-section and length are made of three different materials of thermal conductivity and , respectively. They are joined together at their ends to make a long rod (see figure). One end of the long rod is maintained at and the other at (see figure). If the joints of the rod are at and in steady and there is no loss of energy from the surface of the rod, the correct relationship between and is :


Consider a pair of insulating blocks with thermal resistances , and as shown in the figure. The temperature at the boundary between the two blocks is

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are and . The thermal conductivity of the composite rod will be



Heat flow | Electrostatics |

Statement Convection involves flow of matter within a fluid due to unequal temperatures of its parts.
Statement A hot bar placed under a running tap water loses heat due to effect of convection within water.
Statement. Heat transfer always involves temperature difference between two systems.

A thin piece of thermal conductor of constant thermal conductivity insulated on the lateral sides connects two reservoirs which are maintained at temperatures, and, as shown. Assuming that the system is in steady-state, which of the following plots best represents the dependence of the rate of change of entropy on the ratio of temperatures,

What is thermal conductivity? What is its SI unit?


