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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
Thermal energy travels in
one way
two ways
three ways
four ways
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Heat Transfer
Radio waves that carry signals of radio and television, travel at
speed of light
speed of comet
speed of Earth
speed of Venus
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Heat Transfer
For transferring of heat, conduction and convection need a
vacuum
space
sphere
medium
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Heat Transfer
If a substance is hot, its particles will
move fast than the cooler object
move slow than the cooler object
move as the cooler object
may move fast or slow than the cooler object
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Heat Transfer
Nowadays, instead of glass, manufacturers are using
double sided metal
single sided metal
shiny metal
dull metal
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Heat Transfer
Soil and plants emit
low ultraviolet rays
high ultraviolet rays
low infrared waves
high infrared waves
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Heat Transfer
The excess warming of earth due to greenhouse stimulator is called
earth warming
CFC warming
greenhouse warming
global warming
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Heat Transfer
A lot of heat turns the color of a metal
yellow
orange
red
blue
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Heat Transfer
‘Thermos’ is also known as
temperature flask
heat flask
thermal flask
vacuum flask
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Heat Transfer
Warm air rises because it is
more dense than cool air
equally dense as cool air
less dense than cool air
completely dense
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