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


13.
Who derived Stokes' law of viscous drag?
A.
Reynolds
B.
Isaac Newton
C.
Sir George Gabriel Stokes
D.
Daniel Bernoulli
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ANSWER :
C. Sir George Gabriel Stokes
14.
In Stokes' formula F = 6πηrv, the factor 6π comes from:
A.
Pythagorean theorem
B.
Spherical coordinates
C.
Empirical fitting only
D.
Detailed analysis of laminar flow around a sphere using Navier-Stokes equations
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ANSWER :
D. Detailed analysis of laminar flow around a sphere using Navier-Stokes equations
15.
If a steel sphere of radius r and density ρ_s falls through a fluid of density ρ_f and viscosity η, the gravitational force on the sphere is:
A.
(4/3)πr³ρ_s × g
B.
πr²ρ_s × g
C.
(2/9)r²ρ_s × g
D.
(4/3)πr³ρ_f × g
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ANSWER :
A. (4/3)πr³ρ_s × g
16.
The buoyant force on a sphere of radius r immersed in a fluid of density ρ_f is:
A.
6πηrv
B.
(4/3)πr³ρ_f × g
C.
(4/3)πr³ρ_s × g
D.
πr²ρ_f × g
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ANSWER :
B. (4/3)πr³ρ_f × g
17.
Terminal velocity is:
A.
Initial velocity of the body
B.
Velocity at the bottom
C.
Velocity of the fluid
D.
The constant maximum velocity attained by a body falling through a fluid when net force on it becomes zero
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ANSWER :
D. The constant maximum velocity attained by a body falling through a fluid when net force on it becomes zero
18.
At terminal velocity, the net force on the falling sphere is:
A.
Equal to weight
B.
Equal to drag force only
C.
Zero
D.
Maximum
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ANSWER :
C. Zero