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KEAM 2016 Physics and Chemistry Paper
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© examsnet.com
Question : 11
Total: 120
If a capillary tube of radius
r
is immersed in a liquid, then the liquid rises to a height
h
.
The corresponding mass of liquid column is
m
.
The mass of water that would rise in another capillary tube of twice the radius is
2
m
5
m
3
m
4
m
m
∕
2
Validate
Solution:
Given, radius of first capillary tube
=
r
Height of nised liquid in first capillary tube
=
h
Mass of liquid in first capillary tube
=
m
We know that.
or
m
∝
π
2
h
m
∝
r
2
h
m
=
constant
So.
h
∝
1
r
⇒
m
∝
r
Now,
m
2
m
1
=
r
2
r
1
⇒
m
2
m
1
=
r
2
r
1
=
2
m
2
=
2
m
1
or
m
2
=
2
m
{
∵
m
1
=
m
}
© examsnet.com
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