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Class 11
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Physics
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Thermal Properties of Matter
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BITSAT Questions
Thermal Properties Of Matter
Physics
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A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?
A
Radiation
B
Convection
C
Conduction
D
Temperature remains unchanged
Easy
BITSAT
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0
.
5
moles of an ideal gas at constant temperature
2
7
∘
C
kept inside a cylinder of length
L
and cross-section area
A
closed by a massless piston.
The cylinder is attached with a conducting rod of length
L
, cross-section area
(
9
1
)
m
2
and thermal conductivity
k
, whose other end is maintained at
0
∘
C
. If piston is moved such that rate of heat flow through the conducing rod is constant then velocity of piston when it is at height
2
L
from the bottom of cylinder is:
[Neglect any kind of heat loss from system]
A
(
R
k
)
m
/
s
e
c
B
(
1
0
R
k
)
m
/
s
e
c
C
(
1
0
0
R
k
)
m
/
s
e
c
D
(
1
0
0
0
R
k
)
m
/
s
e
c
Hard
BITSAT
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>