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a
the velocity of a fluid particle remains constant
b
the velocity of all fluid particles crossing a given position is constant
c
the velocity of all fluid particles at a given instant is constant
d
the speed of a fluid particle remains constant
answer is B.
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Detailed Solution
As we know for a streamline flow of a liquid velocity of each particle at a particular cross-section is constant, because Av = constant(law of continuity) between two cross-section of a tube of flow.