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Heat Transfer
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General Science for Class 7
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Heat Transfer
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Heat Transfer
The name of the scientist who invented thermos is
John Dalton
James Dewar
John Edison
James Blake
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Heat Transfer
When warm air rises over sea, its previous position is replaced by
more warm air from sea
cool air from sea
more cool air from land
warm air from land
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Heat Transfer
In hot places, well insulated house stays
warm
hot
cool
normal
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Heat Transfer
Mostly people wear black or dark colored clothes in winter, because dark colors
absorb more heat
absorb less heat
reflect more heat
transfer less heat
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Heat Transfer
The excessive loss of heat is also harmful for
environment
surroundings
trees and forests
glaciers
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Heat Transfer
White painted roof and walls prevent
excess heat loss
excess heat absorption
excess heat loss and absorption
excess heat transfer
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Heat Transfer
Like light and heat, radio waves can also travel through
water
solids
sand
vacuum
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Heat Transfer
At night, the convection current of land and sea
remains same
stops
is reversed
is converted to radiation current
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Heat Transfer
Poor conductor of heat is called
electrical insulator
electrical conductor
thermal conductor
thermal insulator
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Heat Transfer
In a thermograph, heat is identified by
different sizes of lines on a photograph
different shapes on a photograph
different colors on a photograph
different images on a photograph
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