Thermal Propert...

The thermal conductivity of a material in CGS system is 0.4. In steady state the rate of flow of heat $$10 \,cal/s-cm^2$$, then the thermal gradient will be

A building at a temperature T(in k) is heated by an ideal heat pump which uses the amosphere at $$T_0(k)$$. What is the equilibrium temperature of the building ? 

Two metal rods, rod-1 and rod-2 of equal length are welded together end to end.Under steady state conditions, when the free end of the end of the rod-1 is kept at $$100^0C$$  and the free end of the rod -2 is kept at $$0^0C$$ , the temperature at the welded junction is approximately.

The radii of two spheres made of same metal are $$r$$ and $$2r$$. These are heated to the same temperature and placed in the same surrounding. The ratio of rates of decrease of their temperature will be:

'Thermos Flask' was invented by

Thermal radiation can be detected by.

Which one of the following statements is not true regarding thermal radiations?

A cube, a thin circular plate, and a sphere are made of the same metal and having the same mass and same volume. They are initially heated to the same temperature. When left in air at the room temperature, which of these bodies will cool fastest and slowest respectively?

The temperature (T) of one mole of an ideal gas varies with its volume (V) as $$T = -\alpha { V }^{ 3 }+\ \beta { V }^{ 2 }$$, where $$\alpha$$ and $$\beta$$ are positive constants. The maximum pressure of gas during this process is

Two identical glass bulbs are interconnected by a thin glass tube at $$0^{\circ}C$$. A gas is filled at N.T.P. in these bulb is placed in ice and another bulb is placed in hot bath, then the pressure of the gas becomes $$1.5\ times$$. The temperature of hot bath will be