SSC JE Mechanical Engineering 2018 Set 4 Paper

In the case of turbulent flow shear stresses are more compared to laminar flow.
${\mathit{\tau }}_{\mathrm{turbulent}}>{\mathit{\tau }}_{\mathrm{laminar}\mathrm{flow}}$
$\frac{\mathit{d}\mathit{u}}{\mathit{d}\mathit{y}}\mathit{\mu }=\mathit{\tau }$
Here $\frac{\mathit{d}\mathit{u}}{\mathit{d}\mathit{x}}$ = velocity gradient

Comparison of laminar and turbulet velocity profiles in duct; a) laminar, b) turbulent