EASY
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IMPORTANT
Earn 100

For proper ventilation of the building, windows must be open near the bottom and top of the walls to let pass
(a)more air.
(b)cool air near the bottom and hot air near the roof.
(c)cool air near the roof and hot air near the bottom.
(d)out hot air near the roof.
(e)less air.

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Important Questions on Calorimetry and Heat Transfer
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IMPORTANT
The layers of atmosphere are heated through

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IMPORTANT
In which of the following process, convection does not take place primarily?

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Distribution of energy in the spectrum of a black body can be correctly represented by

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IMPORTANT
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IMPORTANT
The maximum energy in thermal radiation from a source occurs at wavelength .
The effective temperature of the source is approximately (Wien's displacement constant,

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IMPORTANT
The intensity of radiation emitted by the sun has its maximum value at a wavelength of and that emitted by the North star has the maximum value at . If these stars behave like black bodies, then the ratio of the surface temperature of the sun and North star is

EASY
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IMPORTANT
The area of the hole of the heat furnace is . It radiates of heat per hour. If the emissivity of the furnace is , then its temperature is
