In which one of the following cases will the liquid flow in a pipe be most streamlined

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Liquid of low viscosity and low density flowing through a pipe of large radius

Liquid of low viscosity and high density flowing through a pipe of large radius

Liquid of high viscosity and low density flowing through a pipe of small radius

Liquid of high viscosity and high density flowing through a pipe of small radius

answer is B.

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Detailed Solution

For streamline flow, Reynold's number $N_{R} \propto \frac{rρ}{η}$ should be less. For less value of N_R, radius and density should be small and viscosity should be high.

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