For a Newtonian fluid

shear stress is proportional to shear strain

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rate of shear stress is proportional to shear strain

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shear stress is proportional to rate of shear strain

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rate of shear stress is proportional to rate of shear strain

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Solution

The correct option is C shear stress is proportional to rate of shear strain
For a Newtonian fluid,
$τ \propto \frac{d u}{d y}; τ = μ \frac{d u}{d y}$
where $τ = S h e a r s t r e s s$
$\frac{d u}{d y} = v e l o c i t y g r a d i e n t = R a t e o f s h e a r s t r a i n$

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