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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
We can see sunlight because
light can pass through air
light can pass through opaque solids
light can pass through vacuum
light travels in straight line
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Heat Transfer
The inner two walls of the flask are made of
steel
metalloid
glass
metal
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Heat Transfer
‘Thermos’ keeps
liquids hot
liquids cold
liquids hot or cold, depending on their temperature
liquids at normal temperature
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Heat Transfer
By placing our hand above a hot object, we can feel heat because
it is releasing heat
our hand is releasing heat
our hand is cooling down
our hand is heating up
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Heat Transfer
Quilts and jackets keep us warm by
trapping air
preventing release of heat from our body
heating itself up
maintaining body temperature
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Heat Transfer
If a radiator is installed in a room, it warms air by the process of
conduction
convection
radiation
warming
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Heat Transfer
The light cannot travel from sun to earth by
convection only
conduction only
conduction and convection both
radiation only
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Heat Transfer
If air is heated, it
rises
falls
compresses
gets dense
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Heat Transfer
The objects those are warmer than their surroundings
gain heat
lose heat
transfer heat
share heat
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Heat Transfer
From earth, sun is about
100 million km away
125 million km away
150 million km away
175 million km away
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