Critical Velocity NEET Questions

Physics - Properties of Solids and Liquids

Critical Velocity MCQ Questions


1.
The flow of a fluid is said to be steady if at any given point:
A.
The fluid is at rest everywhere
B.
The pressure is equal at all points
C.
The velocity of every fluid particle is the same at all points
D.
The velocity of each passing fluid particle remains constant in time at that point
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ANSWER :
D. The velocity of each passing fluid particle remains constant in time at that point
2.
In steady fluid flow, the velocity at different points in space:
A.
Must be equal to the speed of sound
B.
Must be zero at all points
C.
Can be different at different points, but constant in time at each fixed point
D.
Must be the same at all points
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ANSWER :
C. Can be different at different points, but constant in time at each fixed point
3.
A streamline is defined as:
A.
A line connecting points of equal speed
B.
A curve whose tangent at any point is in the direction of the fluid velocity at that point
C.
The path traced by a fluid particle over time
D.
A line along which pressure is constant
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ANSWER :
B. A curve whose tangent at any point is in the direction of the fluid velocity at that point
4.
In a steady flow, two streamlines can NEVER cross each other. This is because:
A.
If they crossed, a fluid particle at the intersection would have two different velocity directions — contradicting steady flow
B.
The fluid pressure prevents crossing
C.
Surface tension prevents crossing
D.
Viscosity keeps streamlines parallel
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ANSWER :
A. If they crossed, a fluid particle at the intersection would have two different velocity directions — contradicting steady flow
5.
In steady flow, the map of streamlines is:
A.
Dependent on the observer's position
B.
Stationary in time — the same pattern of streamlines exists at every instant
C.
Constantly changing with time
D.
Random at each instant
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ANSWER :
B. Stationary in time — the same pattern of streamlines exists at every instant
6.
In steady flow, every fluid particle passing through a given point:
A.
Follows a completely different path
B.
Behaves exactly as the previous particle that passed through that point
C.
Has a different velocity from the previous particle
D.
Accelerates continuously
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ANSWER :
B. Behaves exactly as the previous particle that passed through that point