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Which of the following satisfy n=1 (where n is flow behavior index)?

a) Pseudoplastic fluid
b) Thixotropic fluid
c) Newtonian fluid
d) Diliant fluid

Answer: c
Explanation: The n=1 for Newtonian fluids. Newtonian fluid is a fluid in which the viscous stresses arising from its flow, at every point. The stress is linearly proportional to the local strain rate—the rate of change of its deformation over time.

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