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Class 11
Physics
Mechanics
Mechanical Properties of Fluids
The surface tension of a liquid
(a)
increases with area
(b)
decreases with area
(c)
increase with temperature
(d)
decrease with temperature
Correct answer:
(d)
Solution:
The surface tension of a liquid
decreases with temperature.
T
=
T
0
(
1
−
α
t
)
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mechanical properties of fluids
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View Similar topics ->
mechanical properties of fluids
laws of motion
energy and power
work
gravitation
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The pressure of air inside a soap bubble of diameter
0
.
7
c
m
is
8
m
m
of water above atmospheric pressure, the surface tension of
soap solution is :
Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :
Assertion :Surface tension of oil drop is same whether placed on glass or water surface.
Reason :Surface energy is dependent only on the properties of oil.
The pressure inside a small air bubble of radius
0
.
1
m
m
situated just below the surface of water will be equal to
[Take surface tension of water
7
0
∗
1
0
−
3
N
m
−
1
and atmospheric pressure
1
.
0
1
3
∗
1
0
5
N
m
−
2
]
The osmotic pressure at
1
7
∘
C
of an aqueous solution containing
1
.
7
5
g
of sucrose per
1
5
0
m
l
solution is:-
Two soap bubbles of radius
r
1
=
r
and
r
2
=
2
r
coalesce to form a double as shown, then angle
p
j
i
, is equal to
A water drop is divided into 8 equal droples. The pressure difference between innere outer sides of the log drop:
Assertion :A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube.
Reason :The excess pressure inside bubble (or drop) is inversely proportional to the radius.
The pressure of air inside a soap bubble of diameter
0
.
7
c
m
is
8
m
m
of water above atmospheric pressure, the surface tension of
soap solution is :
Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :
Assertion :Surface tension of oil drop is same whether placed on glass or water surface.
Reason :Surface energy is dependent only on the properties of oil.
The pressure inside a small air bubble of radius
0
.
1
m
m
situated just below the surface of water will be equal to
[Take surface tension of water
7
0
∗
1
0
−
3
N
m
−
1
and atmospheric pressure
1
.
0
1
3
∗
1
0
5
N
m
−
2
]
The osmotic pressure at
1
7
∘
C
of an aqueous solution containing
1
.
7
5
g
of sucrose per
1
5
0
m
l
solution is:-
Two soap bubbles of radius
r
1
=
r
and
r
2
=
2
r
coalesce to form a double as shown, then angle
p
j
i
, is equal to
A water drop is divided into 8 equal droples. The pressure difference between innere outer sides of the log drop:
Assertion :A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube.
Reason :The excess pressure inside bubble (or drop) is inversely proportional to the radius.
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