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Transfer of Heat
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Transfer of Heat
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Transfer of Heat
The amount of heat absorbed by a body depends upon the
colour of its surface only
nature of its surface only
mass of its surface
colour and nature of its surface
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Transfer of Heat
The rising currents of hot air are called
air currents
thermals
radiation
layers
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Transfer of Heat
The rate of heat flow is
amount of heat in unit time
amount of heat in zero time
amount of coolness in unit time
amount of coolness in zero time
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Transfer of Heat
A transparent polyethene sheet works as heat trapper because it
traps radiations of sun inside only
passes radiations of short wavelength only
traps long wavelength radiations
traps radiation of sun inside and passes radiations of short wavelength
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Transfer of Heat
A metal box having four faces of different nature is called
Leslie triangle
Leslie hexagon
Leslie pentagon
Leslie cube
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Transfer of Heat
The mode of transfer of heat by vibrating atoms and free electrons in solids from hot to cold parts of a body is known as heat’s
radiation
convection
conduction
fusion
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Transfer of Heat
If the temperature difference between hold and cold faces of the solids is greater, the rate of flow of heat will be
zero
constant
smaller
greater
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Transfer of Heat
Transfer of heat by actual movement of molecules from a hot place to a cold place is known as
radiation
conduction
convection
fusion
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Everyday Science
Poor conductors of heat are
liquids only
gases only
metals
liquids and gases
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Transfer of Heat
The rate of emission of radiation depends on
color and texture of surface
surface temperature
surface area
all of above
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