41.
Unit of thermal diffusivity is

42.
Temperature of steam at around 540°C can be measured by

43.
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

44.
The use of heat exchangers is made in

45.
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

46.
Which of the following statement is wrong?

47.
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

48.
Planck’s law holds good for

49.
Thermal conductivity of a material may be defined as the

50.
A perfect black body is one which

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