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