Terminal Velocity NEET Questions

Physics - Properties of Solids and Liquids

Terminal Velocity MCQ Questions


1.
Terminal velocity is defined as:
A.
The maximum constant velocity attained by a body falling through a viscous medium when net force on it becomes zero
B.
The velocity at which buoyancy equals atmospheric pressure
C.
The velocity of the fluid surrounding the falling body
D.
The initial velocity with which a body enters a viscous fluid
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ANSWER :
A. The maximum constant velocity attained by a body falling through a viscous medium when net force on it becomes zero
2.
When a sphere falling through a viscous fluid reaches terminal velocity, which of the following correctly describes the force balance?
A.
Weight = Viscous drag only
B.
Buoyant force = Viscous drag only
C.
Weight = Buoyant force only
D.
Weight = Buoyant force + Viscous drag (Stokes force)
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ANSWER :
D. Weight = Buoyant force + Viscous drag (Stokes force)
3.
As a sphere falls through a viscous fluid before reaching terminal velocity, its acceleration:
A.
Remains constant throughout the fall
B.
Is zero from the beginning
C.
Starts at zero, increases, then becomes zero
D.
Starts at maximum and progressively decreases to zero
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ANSWER :
D. Starts at maximum and progressively decreases to zero
4.
The net downward force on a sphere of radius a, density ρ, falling through a fluid of density σ and viscosity η at velocity v (before terminal velocity) is:
A.
(4/3)πa³ρg
B.
(4/3)πa³(ρ−σ)g − 6πηav
C.
(4/3)πa³(ρ+σ)g + 6πηav
D.
6πηav − (4/3)πa³(ρ−σ)g
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ANSWER :
B. (4/3)πa³(ρ−σ)g − 6πηav
5.
At terminal velocity, the acceleration of the falling body is exactly:
A.
g/2
B.
Zero
C.
g(1 − σ/ρ)
D.
g (acceleration due to gravity)
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ANSWER :
B. Zero
6.
NCERT describes the process of a raindrop reaching terminal velocity. The raindrop:
A.
Accelerates initially due to gravity; as velocity increases, retarding force increases; finally reaches constant terminal velocity
B.
Accelerates initially, then decelerates to zero velocity, then falls at v_t
C.
Falls at constant velocity from the moment it forms
D.
Falls at free-fall acceleration throughout
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ANSWER :
A. Accelerates initially due to gravity; as velocity increases, retarding force increases; finally reaches constant terminal velocity