Viscosity NEET Questions

Physics - Properties of Solids and Liquids

Viscosity MCQ Questions


7.
Honey is more viscous than oil. This means that compared to oil, honey:
A.
Flows more easily under the same applied force
B.
Has a higher density only
C.
Reaches the same terminal velocity faster
D.
Offers greater resistance to flow — requires greater force to move a plate through honey at the same velocity
😑 View Answer Rough Work Error
ANSWER :
D. Offers greater resistance to flow — requires greater force to move a plate through honey at the same velocity
8.
In NCERT's viscosity discussion, a portion of liquid which at some instant has shape ABCD takes the shape AEFD after a short interval Δt. The shear strain produced is:
A.
v/L
B.
F/A
C.
ΔL/L
D.
Δx/L (where Δx is lateral displacement, L is height between plates)
😑 View Answer Rough Work Error
ANSWER :
D. Δx/L (where Δx is lateral displacement, L is height between plates)
9.
Unlike solids where stress depends on strain, in a flowing fluid the stress depends on the:
A.
Rate of shear strain (dv/dy or v/L)
B.
Strain itself
C.
Pressure gradient only
D.
Total displacement of layers
😑 View Answer Rough Work Error
ANSWER :
A. Rate of shear strain (dv/dy or v/L)
10.
The coefficient of viscosity η (eta) is defined as:
A.
Shearing stress / strain rate (shearing stress / (v/l))
B.
Shearing strain / shearing stress
C.
Density × velocity
D.
Force × area / velocity
😑 View Answer Rough Work Error
ANSWER :
A. Shearing stress / strain rate (shearing stress / (v/l))
11.
The mathematical formula for coefficient of viscosity η in terms of force F, area A, layer separation l, and velocity v is:
A.
η = Av/(Fl)
B.
η = FAv/l
C.
η = Fl/(Av)
D.
η = F/(Avl)
😑 View Answer Rough Work Error
ANSWER :
C. η = Fl/(Av)
12.
The SI unit of coefficient of viscosity is:
A.
N m⁻² (Pascal)
B.
N m⁻³
C.
N s m⁻² (or Pa·s) — called poiseuille (Pl)
D.
kg m⁻¹
😑 View Answer Rough Work Error
ANSWER :
C. N s m⁻² (or Pa·s) — called poiseuille (Pl)