Coefficient of Viscosity of a Given Viscous Liquid by Measuring the Terminal Velocity of a Given Spherical Body NEET Questions

Physics - Experimental Skills

Coefficient of Viscosity of a Given Viscous Liquid by Measuring the Terminal Velocity of a Given Spherical Body MCQ Questions


7.
The velocity gradient has SI units of:
A.
N
B.
m/s
C.
s⁻¹ (per second)
D.
m·s
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ANSWER :
C. s⁻¹ (per second)
8.
Streamline (laminar) flow is a flow in which:
A.
Layers mix randomly
B.
There is no flow
C.
Each layer of fluid flows smoothly past the next, and the velocity at every point remains constant in time
D.
There is turbulence
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ANSWER :
C. Each layer of fluid flows smoothly past the next, and the velocity at every point remains constant in time
9.
Turbulent flow is a flow in which:
A.
Layers mix chaotically and velocity varies randomly with time
B.
Velocity is constant everywhere
C.
Flow is purely along streamlines
D.
There is no friction
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ANSWER :
A. Layers mix chaotically and velocity varies randomly with time
10.
Reynolds number is a dimensionless quantity that:
A.
Indicates pressure
B.
Indicates volume
C.
Indicates whether flow is laminar (Re < 2000) or turbulent (Re > 3000)
D.
Indicates the temperature
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ANSWER :
C. Indicates whether flow is laminar (Re < 2000) or turbulent (Re > 3000)
11.
Stokes' law gives the viscous drag force on a small spherical body moving through a viscous fluid as:
A.
F = ηrv
B.
F = πηr²v
C.
F = (4/3)πηr³v
D.
F = 6πηrv
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ANSWER :
D. F = 6πηrv
12.
Stokes' law is valid only when:
A.
Body moves with very high speed
B.
Body is irregularly shaped
C.
Flow is turbulent
D.
The motion is slow (laminar flow), the body is small and spherical, and the fluid is infinite in extent
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ANSWER :
D. The motion is slow (laminar flow), the body is small and spherical, and the fluid is infinite in extent