41.
What is the property of a liquid due to which its free surface tries to have minimum surface area?
A
Viscosity
B
Buoyancy
C
Surface Tension
D
Rigidity
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What is the property of a liquid due to which its free surface tries to have minimum surface area?
Viscosity
Buoyancy
Surface Tension
Rigidity
What is the main cause of capillarity?
difference in weight of fluids
pressure difference
temperature difference
velocity gradient
The unit of surface tension in the CGS system is
N/m
Kg/cm
Dynes/cm
Dynes/m
The surface tension of water at 250C is
90.0 dynes/cm
45.63 dynes/cm
82.5 dynes/cm
72.14 dynes/cm
The surface tension of a liquid is T. the increase in its surface energy on increasing the surface area by A is
AT-1
AT
A2T
A2T2
The pressure just below the meniscus of water
Is greater than just above it
Is less than just above it
Is same as just above it
Is always equal to atmospheric pressure.
The apparatus used for the determination of surface tension of a liquid is
Oedometer
Stalagmometer
Consolidometer
None of the mentioned
The angle of contact for liquid on a solid surface is the angle between:
the tangent to the liquid surface at the point of contact and the solid surface
the tangent to the solid surface at the point of contact and the liquid surface
the liquid surface and the solid surface at the point of contact
none of the above.
Surface tension of liquid is independent of the
Temperature of the liquid
Area of the liquid surface
Nature of the liquid
Impurities present in the liquid
Stalagmometer is cleaned to remove grease with the help of
Chromic acid
Sulphuric acid
Distilled water
Tartaric acid
Shapes of drops of liquid are spherical because of
Viscosity
Conductivity
Absorption
Surface tension
Select the incorrect statement from the following option.
In case of mercury and glass, we observe a convex meniscus
Surface tension is responsible for the rise and fall of the capillary tubes
If two drops encounter each other, they tend to repel each other
All of the mentioned
Rain drops are spherical because of
Gravitational force
Surface tension
Air resistance
Low viscosity of water
Potential energy of a molecule on the surface of a liquid is as compare to another molecule inside of the liquid is
More
Less
Both a and b
None of these
On increasing the temperature, the surface tension of the liquid
Increases
Decreases
Remains constant
None of the mentioned
On increasing the temperature, the kinetic energy of the liquid molecules
Increases
Decreases
Remains constant
None of the mentioned
Meniscus of mercury in capillary is
Concave
Convex
Plane
Cylindrical
In flow field, point exist at surface of object where fluid is brought to rest by object is called
field point
surface point
stagnation point
object point
In case of water and glass, we get a concave meniscus because the adhesive force between water and glass are ...........than the cohesive forces between water molecules.
Weaker
Stronger
Same
None of the mentioned
If drops and bubbles do not collapse under the effect of gravity, it indicates that
pressure inside the drop is greater than outside
pressure inside the drop is lower than outside it
Surface tension is low
Viscosity is large