Streamline, and Turbulent Flow, Stoke's Law NEET Questions

Physics - Properties of Solids and Liquids

Streamline, and Turbulent Flow, Stoke's Law MCQ Questions


7.
NCERT describes the path of a particle as shown in Fig 9.7(a). The curve PQ 'is like a permanent map of fluid flow.' This means:
A.
The map shows particle positions at one instant only
B.
In steady flow, the same streamline pattern persists at every instant — it is time-independent
C.
The streamline pattern changes every second
D.
The map shows pressure distribution
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ANSWER :
B. In steady flow, the same streamline pattern persists at every instant — it is time-independent
8.
In a steady flow, no two streamlines can cross each other. If two streamlines cross at point X, then at that point:
A.
Pressure is zero
B.
The velocity would have two directions simultaneously — an impossibility in steady flow
C.
The density must be very high
D.
The fluid must be compressible
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ANSWER :
B. The velocity would have two directions simultaneously — an impossibility in steady flow
9.
The tangent to a streamline at any point gives:
A.
The direction of fluid velocity at that point
B.
The direction of buoyant force
C.
The magnitude of velocity at that point
D.
The direction of pressure gradient at that point
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ANSWER :
A. The direction of fluid velocity at that point
10.
In the NCERT figure (Fig 9.7b), streamlines are drawn for flow in a tube of varying cross-section. Closely spaced streamlines indicate:
A.
Higher pressure at that region
B.
Lower fluid velocity at that region
C.
The fluid is at rest
D.
Higher fluid velocity at that region (smaller effective area, more flow per unit area)
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ANSWER :
D. Higher fluid velocity at that region (smaller effective area, more flow per unit area)
11.
In Fig 9.7(b) of NCERT, three regions P, R, Q are indicated in a streamline flow tube. It is clear that A_R > A_Q. Therefore, comparing velocities at R and Q:
A.
v_R × v_Q = constant
B.
v_R = v_Q
C.
v_R > v_Q
D.
v_R < v_Q (fluid accelerates from R to Q as the tube narrows)
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ANSWER :
D. v_R < v_Q (fluid accelerates from R to Q as the tube narrows)
12.
The volume flux (volume flow rate) Av for steady incompressible flow in a pipe:
A.
Varies from cross-section to cross-section
B.
Remains constant throughout the entire length of the pipe
C.
Equals the pressure at each cross-section
D.
Is zero at narrow sections
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ANSWER :
B. Remains constant throughout the entire length of the pipe