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Class 11
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Surface Tension
Surface Tension
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1)
Why are rain drops spherical in shape?
Surface tension.
Capillarity.
Downward movement.
Acceleration due to gravity.
2)
The force of cohesion is maximum in ________.
Gases
Ideal gas
Liquids
Solids
3)
Which of the following liquids show capillary depression?
None of these.
Mercury
Glycerine
Water
4)
Where do we find adhesive force?
All of the above.
Between similar molecules.
Between polar molecules.
Between different molecules.
5)
Choose the correct statement.
The S.I. unit of surface tension is N/m.
Water sticks to the glass of windows due to adhesion.
All of the above.
Cohesive force of mercury is larger than that of water.
6)
Liquids which have more adhesive force than cohesive force show ________.
Convex meniscus
No fixed shape
Plane meniscus
Concave meniscus
7)
What is the angle of contact for water and glass?
8⁰
180⁰
90⁰
0⁰
8)
What happens in the capillary rise of a liquid, when the radius of the capillary tube increases?
Decreases.
Remains unchanged.
Increases.
Become zero.
9)
When there are no external forces, what is the shape of a liquid drop determined by?
Surface tension.
None of these.
Viscosity.
Gravitational force.
10)
If the angle of contact between a solid and a liquid is 90⁰, then:
Cohesive force >> adhesive force
Cohesive force > adhesive force
Cohesive force = adhesive force