${[\tau]=[ L ]\left[ MLT ^{-2}\right] }$

$\Rightarrow ML ^2 T ^{-2}$

B. Stress $=\frac{F}{A} \Rightarrow \frac{M L T^{-2}}{ L ^2}$

$[\text { stress }]= ML ^{-1} T ^{-2}$

C.$\text { Pressure gradient }=\frac{\Delta P }{\Delta X }$

$\Rightarrow \frac{[ F / A ]}{[ L ]} \Rightarrow \frac{ ML T ^{-2}}{ L ^3}$

$\Rightarrow ML ^{-2} T ^{-2}$

D. Coefficient of viscosity $\Rightarrow F=6 \pi \eta rV$

$MLT ^{-2}=[\eta] L ^2 T ^{-1}$

${[\eta]= ML ^{-1} T ^{-1}}$