1. What is surface tension?
A.
Force acting per unit length along the surface of a liquid
B.
Force acting per unit area inside a liquid
C.
Mass of liquid present per unit volume
D.
Pressure exerted by a liquid on the container
Correct Answer:
Force acting per unit length along the surface of a liquid
Explanation:
Surface tension is defined as the tangential force acting per unit length along the free surface of a liquid.
2. Surface tension is the force required to act along the surface of a liquid per unit ____.
A.
area
B.
length
C.
volume
D.
mass
Correct Answer:
length
Explanation:
By definition, surface tension is force per unit length of the liquid surface.
3. In which direction does the force associated with surface tension act?
A.
Perpendicular to the liquid surface
B.
Tangentially along the liquid surface
C.
Vertically downward through the liquid
D.
Radially toward the centre of the liquid
Correct Answer:
Tangentially along the liquid surface
Explanation:
Surface tension acts tangentially along the free surface of a liquid.
4. What is the SI unit of surface tension?
A.
N m
B.
N m⁻¹
C.
N m⁻²
D.
J m⁻¹
Correct Answer:
N m⁻¹
Explanation:
Surface tension is force per unit length, so its SI unit is newton per metre, written as N m⁻¹.
5. Surface tension is commonly represented by which symbol?
A.
T
B.
S
C.
γ
D.
P
Correct Answer:
γ
Explanation:
The symbol γ (gamma) is commonly used to represent surface tension.
6. Which expression gives the definition of surface tension?
A.
Surface tension = force × length
B.
Surface tension = force ÷ length
C.
Surface tension = length ÷ force
D.
Surface tension = force ÷ area
Correct Answer:
Surface tension = force ÷ length
Explanation:
Surface tension is defined mathematically as force per unit length, or γ = F/l.
7. Surface tension is a property of which part of a liquid?
A.
Only the liquid's interior
B.
The free surface of the liquid
C.
Only the bottom of the container
D.
The vapour above the liquid
Correct Answer:
The free surface of the liquid
Explanation:
Surface tension is associated with the free surface of a liquid and is defined using the force acting along that surface.
8. If a force F acts along a liquid surface of length l, the surface tension is
A.
Fl
B.
F/l
C.
l/F
D.
F + l
Correct Answer:
F/l
Explanation:
Since surface tension is force per unit length, its value is given by F divided by l.
9. Which statement correctly describes surface tension?
A.
It is force per unit length at the liquid surface.
B.
It is energy per unit volume of the liquid.
C.
It is pressure per unit mass of the liquid.
D.
It is volume per unit area of the liquid.
Correct Answer:
It is force per unit length at the liquid surface.
Explanation:
The definition of surface tension is the force acting per unit length along the free surface of a liquid.
10. A liquid surface behaves as if it is under tension because of a force acting along its surface. This force per unit length is called
A.
viscosity
B.
surface tension
C.
vapour pressure
D.
density
Correct Answer:
surface tension
Explanation:
The force per unit length acting along a liquid surface is called surface tension.
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