Surface Tension of Water by Capillary Rise and Effect of Detergents NEET Questions

Physics - Experimental Skills

Surface Tension of Water by Capillary Rise and Effect of Detergents MCQ Questions


7.
Surface tension of water at 20°C is approximately:
A.
0.0073 N/m
B.
7.3 N/m
C.
0.073 N/m (or 73 dyne/cm)
D.
73 N/m
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ANSWER :
C. 0.073 N/m (or 73 dyne/cm)
8.
Cohesive force is the force of attraction between:
A.
Molecules of different substances
B.
Molecules and gravity
C.
Molecules of the same substance
D.
Molecules and atmosphere
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ANSWER :
C. Molecules of the same substance
9.
Adhesive force is the force of attraction between:
A.
Molecules of two different substances in contact
B.
Molecules of a gas
C.
Molecules of the same substance
D.
Atoms within an atom
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ANSWER :
A. Molecules of two different substances in contact
10.
If adhesion of liquid to surface is greater than its cohesion, the liquid:
A.
Always has zero contact angle
B.
Becomes a gas
C.
Wets the surface (concave meniscus, capillary rise)
D.
Does not wet the surface
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ANSWER :
C. Wets the surface (concave meniscus, capillary rise)
11.
The angle of contact between a liquid and a solid surface is measured between:
A.
Two horizontal liquid layers
B.
The vertical and the solid
C.
Two solid surfaces
D.
The tangent to the liquid surface at the point of contact and the solid surface (inside the liquid)
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ANSWER :
D. The tangent to the liquid surface at the point of contact and the solid surface (inside the liquid)
12.
For water in a clean glass capillary, the angle of contact is approximately:
A.
45°
B.
90°
C.
180°
D.
0° (almost zero, water perfectly wets clean glass)
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ANSWER :
D. 0° (almost zero, water perfectly wets clean glass)