Viscosity NEET Questions

Physics - Properties of Solids and Liquids

Viscosity MCQ Questions


1.
Viscosity is best described as:
A.
The surface energy per unit area of a liquid
B.
The compressibility of a fluid under applied stress
C.
The internal friction of a fluid that resists relative motion between adjacent layers
D.
The tendency of a fluid to solidify under pressure
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ANSWER :
C. The internal friction of a fluid that resists relative motion between adjacent layers
2.
Viscosity of a fluid exists when there is:
A.
Only compressive stress in the fluid
B.
The fluid is at rest and in equilibrium
C.
Relative motion between adjacent layers of the liquid
D.
Only surface tension effects
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ANSWER :
C. Relative motion between adjacent layers of the liquid
3.
In the NCERT model of viscosity (oil between two glass plates), the bottom plate is fixed and the top plate is moved with velocity v. The layer of liquid in contact with the top plate has velocity:
A.
v
B.
2v
C.
v/2
D.
Zero
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ANSWER :
A. v
4.
In NCERT's viscosity model (oil between two parallel plates, separation l, top plate velocity v), the velocity profile across the fluid is:
A.
Uniform — same velocity throughout
B.
Parabolic — higher at the centre
C.
Exponential — velocity increases rapidly near top plate
D.
Linear — velocity increases uniformly from 0 at fixed plate to v at moving plate
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ANSWER :
D. Linear — velocity increases uniformly from 0 at fixed plate to v at moving plate
5.
In viscous flow between plates, each layer of liquid is pulled forward by the layer above it and pulled backward by the layer below it. This results in:
A.
A change in fluid density
B.
Zero net force on each layer
C.
A force between the layers that opposes relative motion — the viscous force
D.
An increase in fluid pressure
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ANSWER :
C. A force between the layers that opposes relative motion — the viscous force
6.
The type of flow in which liquid layers slide over one another like pages of a book is called:
A.
Both streamline and laminar flow
B.
Streamline flow
C.
Turbulent flow
D.
Laminar flow
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ANSWER :
A. Both streamline and laminar flow