Critical Velocity NEET Questions

Physics - Properties of Solids and Liquids

Critical Velocity MCQ Questions


7.
When a water tap is turned on slowly, the flow is initially smooth. When flow speed increases beyond a certain limit, the flow:
A.
Becomes more laminar
B.
Stops entirely
C.
Remains smooth but faster
D.
Loses its smoothness and becomes turbulent
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ANSWER :
D. Loses its smoothness and becomes turbulent
8.
Critical velocity is defined as:
A.
The terminal velocity of a sphere in the fluid
B.
The limiting value of flow speed beyond which steady flow loses steadiness and becomes turbulent
C.
The maximum velocity achievable in any fluid
D.
The velocity of sound in the fluid
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ANSWER :
B. The limiting value of flow speed beyond which steady flow loses steadiness and becomes turbulent
9.
Below the critical velocity, the fluid flow is:
A.
Random
B.
Non-existent
C.
Turbulent
D.
Laminar or streamline (steady, orderly flow)
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ANSWER :
D. Laminar or streamline (steady, orderly flow)
10.
Above the critical velocity, the fluid flow is described as:
A.
Viscous
B.
More laminar
C.
Streamlined
D.
Turbulent — chaotic, unsteady flow with irregular eddies
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ANSWER :
D. Turbulent — chaotic, unsteady flow with irregular eddies
11.
When a fast-flowing stream encounters rocks, small foamy whirlpool-like regions called 'white water rapids' are formed. This is an example of:
A.
Turbulent flow above critical velocity
B.
Bernoulli's flow
C.
Laminar flow
D.
Streamline flow
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ANSWER :
A. Turbulent flow above critical velocity
12.
In studying the motion of fluids, the transition from streamline to turbulent flow was first systematically studied by:
A.
Stokes
B.
Osborne Reynolds — he defined the dimensionless Reynolds number to predict this transition
C.
Torricelli
D.
Bernoulli
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ANSWER :
B. Osborne Reynolds — he defined the dimensionless Reynolds number to predict this transition