Surface Energy and Surface Tension (Angle of Contact, Excess of Pressure Across a Curved Surface, Application of Surface Tension - Drops, Bubbles, and Capillary Rise...) NEET Questions

Physics - Properties of Solids and Liquids

Surface Energy and Surface Tension (Angle of Contact, Excess of Pressure Across a Curved Surface, Application of Surface Tension - Drops, Bubbles, and Capillary Rise...) MCQ Questions


1.
Surface tension is defined as:
A.
The energy per unit area of a solid
B.
The force per unit volume of a liquid
C.
The force per unit length acting along the surface of a liquid
D.
The pressure per unit surface area
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ANSWER :
C. The force per unit length acting along the surface of a liquid
2.
Which of the following factors affects surface tension?
A.
Mass
B.
Volume
C.
Temperature
D.
Shape of the container
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ANSWER :
C. Temperature
3.
The angle of contact between water and glass is:
A.
Exactly 90°
B.
Obtuse (> 90°)
C.
Acute (< 90°)
D.
Undefined
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ANSWER :
C. Acute (< 90°)
4.
Which phenomenon is explained by surface tension?
A.
Melting of ice
B.
Boiling of water
C.
Formation of droplets
D.
Expansion of gases
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ANSWER :
C. Formation of droplets
5.
Capillary rise is due to:
A.
Viscosity of the liquid
B.
Gravitational force only
C.
Cohesion and adhesion forces
D.
External pressure
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ANSWER :
C. Cohesion and adhesion forces
6.
Which of the following is an example of capillary action?
A.
The rise of oil in a wick
B.
Heating of water
C.
Melting of ice
D.
Boiling of alcohol
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ANSWER :
A. The rise of oil in a wick