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1.
Calculate the radius of a capillary tube if water rises to a height of 12.5 cm within it, assuming the angle of contact between water and glass to be 0o (g = 10 m s2, p = 1 x 103 kg m -3).
• A.
0.22 mm
• B.
0.18 mm
• C.
0.11 mm
• D.
0.44 mm
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2.
Which of the following statements is correct?
• A.
Surface tension is the energy per unit area of a free liquid surface.
• B.
The unit of surface tension is N m -2 and its dimensions are MLoT-1.
• C.
If a soap bubble is filled with more air, the pressure inside it increases.
• D.
The angle of contact between a solid and a liquid is a property of the shape of the solid.
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3.
When a glass plate is immersed in mercury, the surface near the plate
• A.
becomes concave
• B.
is depressed
• C.
is flat
• D.
is first concave and then depressed
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4.
The dimensions MLoT-2 correspond to
• A.
coefficient of viscosity
• B.
moment of inertia
• C.
surface tension
• D.
surface area
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5.
There is a depression in the surface of the liquid in a capillary when
• A.
the cohesive force is smaller than the adhesive force
• B.
the cohesive force is greater than the adhesive force
• C.
there is an equilibrium between the cohesive and the adhesive force
• D.
none of these is true