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Class 11
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Physics
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Thermal Properties of Matter
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Conduction
Conduction
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Advanced Knowledge of Conduction
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Application of Trapped Air as Insulator
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Conduction
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Conduction using Kinetic Model
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Important Questions
A wall has two layers
A
and
B
, each made of different materials. Both the layers have the same thickness. The thermal conductivity of the material of
A
is twice that of
B
. Under thermal equilibrium, the temperature difference across the wall is
3
6
∘
C
. The temperature difference across the layer
A
is
Medium
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>
Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities
K
and
2
K
respectively. The equivalent thermal conductivity of the slab is
Medium
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>
The dimensional formula for coefficient of thermal conductivity is:
Medium
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>
Two rods
A
and
B
of different materials are welded together as shown in figure. Their thermal conductivities are
K
1
and
K
2
. The thermal conductivity of the composite rod will be :
Medium
NEET
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>
The coefficient of thermal conductivity of copper is
9
times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel?
Medium
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>
Why do we wear cotton clothes in Summer ?
Easy
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>
Two rods of same length and material transfer a given amount of heat in
1
2
seconds , when they are joined in parallel. But when they are joined in series , then they will transfer same heat in same condition in
Medium
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>
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity
K
and
2
K
and thickness
x
and
4
x
, respectively are
T
2
and
T
1
(
T
2
>
T
1
)
. The rate of heat transfer through the slab, in a steady state is
(
X
A
(
T
2
−
T
1
)
K
)
f
,
with
f
equals to
Hard
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>
A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities
K
1
and
K
2
. The equivalent thermal conductivity of the slab is :
Medium
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>
Heat is flowing through two cylindrical rods of same material. The diameters of the rods are in the ratio
1
:
2
and their lengths are in the ratio
2
:
1
. If the temperature difference between their ends is same, then the ratio of amounts of heat
conducted through them per unit time will be :
Medium
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>