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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 good conduction of heat by metals is due to
collision of particles
arrangement of particles
vibration of particles
size of particles
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Heat Transfer
Sunrays warm up the
land before the sea
sea before the land
land and sea at the same time
land but not sea
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Heat Transfer
All substance are made up of particles that are constantly
moving
vibrating
absorbing
releasing
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Heat Transfer
‘Air’ is
thermal conductor
thermal insulator
electrical conductor
an electrolyte
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Heat Transfer
An example of conductor of heat is
paper
cloth
air
aluminum
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Heat Transfer
In fire fighting another use of thermal imaging camera is
spotting source of fire
spotting people in the fire
identifying flammable objects
identifying wood and steel
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Heat Transfer
The rise of warm air and fall of cool air in order to fill the space forms a
radiation current
conduction current
convection current
air current
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Heat Transfer
The higher the temperature, the
more calm vibration in particles
less violent vibration in particles
more violent vibration in particles
none of these
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Heat Transfer
Electric companies use thermal imaging camera to identify
the resistivity of a wire
the resistivity of a resistor
overheating of wires and power lines
the heat released by electrical appliance
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Heat Transfer
Heat is a form of
energy
force
power
resistance
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