In which one of the following cases will the liquid flow in a pipe be most streamlined?
Correct answer: B. Liquid of high viscosity and low density flowing through a pipe of small radius
- A. Liquid of high viscosity and high density flowing through a pipe of small radius
- B. Liquid of high viscosity and low density flowing through a pipe of small radius
- C. Liquid of low viscosity and low density flowing rough a pipe of large radius
- D. Liquid of low viscosity and high density flowing through a pipe of large radius
Explanation
The flow of liquid is most streamlined when it is laminar, which is more likely to occur with high viscosity and low density in a small radius pipe. High viscosity helps to dampen flow disturbances, and low density reduces inertial forces, helping to maintain a steady, layered flow. Option B correctly identifies these conditions. Options A and D involve high density, which increases inertial forces and can promote turbulence. Option C involves low viscosity and a large radius, both of which contribute to turbulent flow rather than laminar flow.
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