"The velocity of entrance and exit through a nozzle remains the same ", is this ever possible?

Only if the flow is compressible

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Only if the flow is laminar

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Only if the flow is rotational

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Never possible

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Solution

The correct option is A Only if the flow is compressible
According to the continuity equation, $ρ A V = constant$ , where $ρ = density$ , A = cross sectional area of flow , V = velocity of flow.
If $V = constant, ρ A = constant$ .
Thus a change is A will mean a change in $ρ$ . Hence the flow is possible only if the fluid is compressible.

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