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KCET 2024 Physics Solved Paper
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© examsnet.com
Question : 6
Total: 60
A solid cube of mass at a temperature
θ
0
is heated at a constant rate. It becomes liquid at temperature
θ
1
and vapour at temperature
θ
2
. Let
s
1
and
s
2
be specific heats in its solid and liquid states respectively. If
L
f
and
L
v
are latent heats of fusion and vaporization respectively, then the minimum heat energy supplied to the cube until it vaporizes is
m
s
1
(
θ
1
−
θ
0
)
+
m
s
2
(
θ
2
−
θ
1
)
m
L
f
+
m
s
2
(
θ
2
−
θ
1
)
+
m
L
v
m
s
1
(
θ
1
−
θ
0
)
+
m
L
f
+
m
s
2
(
θ
2
−
θ
1
)
+
m
L
v
m
s
1
(
θ
1
−
θ
0
)
+
m
L
f
+
m
s
2
(
θ
2
−
θ
1
)
+
m
L
v
Validate
Solution:
Solid
Q
1
─
─
▶
Solid
at
MP
Q
2
─
─
▶
Liquid
Q
3
─
─
▶
Liquid
at
BP
Q
4
─
─
▶
Vapour
Q
1
So
Q
=
m
s
1
(
θ
−
θ
0
)
+
m
L
f
+
m
s
2
(
θ
2
−
θ
1
)
+
m
L
v
© examsnet.com
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