A tube shaped like a parallelogram is filled with liquid is kept in a vertical plane. Tube is heated at mid point of ad. The heat flows only by convection. Then
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A cylindrical rod of aluminium is of length and radius . The two ends are maintained at temperatures of and the coefficient of thermal conductivity is . Then the thermal resistance of the rod in is
318
31.8
3.18
0.318
Thermal resistance
Where . & A(cylindrical rod)
So
Good absorbers of heat are
poor emitters
good emitters
non-emitters
highly polished
Three bodies A, B and C have equal area which are painted red, yellow and black respectively. If they are at same temperature, then
emissive power of is maximum.
emissive power of and are equal.
Sweet makers do not clean the bottom of cauldron because
emission power of black and bright surface is more.
absorption power of black and bright surface is more.
black and rough surface absorbs more heat.
transmission power of black and rough surface is more.
At temperature , the emissive power and absorption power of a body for certain wavelength are and respectively, then
no difinite relation between and
Which of the following is used as a coolent in automobile radiator as well as a heater in hot water bags?
Ice
Sand
Water
All of these
Water has highest specific heat capacity and hence it is used as a coolant in car radiators as well as heater in hot water bags:
of water and of ice at are in a calorimeter whose water equivalent is of steam at is added to it. Then water in the calorimeter is : (Latent heat of ice , Latent heat of steam )
As of steam at melts of ice at . of steam will melt of ice at Water in calorimeter
On observing light from three different stars and , it was found that intensity of violet colour is maximum in the spectrum of , the intensity of green colour is maximum in the spectrum of and the intensity of red colour is maximum in the spectrum of . If and are the respective absolute temperature of and , then it can be concluded from the above observations that
From Wein's displacement law, - max. intensity is at violet is minimum temp maximum
- max. intensity is at green is moderate temp moderate
max. intensity is at red is maximum temp minimum, i.e.,
A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be
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