A perfect black body is one which – McqOptions

MCQOPTIONS

1.	A perfect black body is one which
A.	is black in colour
B.	absorbs heat radiations of all wave lengths falling on it
C.	reflects all the heat radiations
D.	transmits the heat radiations
Answer» C. reflects all the heat radiations

Discussion

No Comment Found

Related MCQs

The absolute humidity is the mass of water vapour present in 1 m3 of dry air.
When tc1 and tc2 are the temperatures of cold fluid at entry and exit respectively and th1 and th2 are the temperatures of hot fluid at entry and exit point, and cold fluid has lower heat capacity rate as compared to hot fluid, then effectiveness of the heat exchanger is given by
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.
The heating of air, without any change in its specific humidity, is known as sensible heating.
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
Thermal conductivity of solid metals __________ with rise in temperature.
Wet bulb temperature indicates the moisture content in air.