List of top Chemistry Questions on Fluid Mechanics

Which of the following statement/s is/are correct with regards to the tangential force which is needed to keep the speeds of different layers of liquid constant? 

(A) It is directly proportional to the velocity difference between the two adjacent layers. 
(B) It is inversely proportional to the area of contact between the two adjacent layers. 
(C) It is inversely proportional to the distance between the two adjacent layers. 
(D) None of the above. 
 

$XY$ is the membrane / partition between two chambers 1 and 2 containing sugar solutions of concentration $\mathrm{c}_{1}$ and $\mathrm{c}_{2}\left(\mathrm{c}_{1}>\mathrm{c}_{2}\right) \mathrm{mol} \mathrm{L}^{-1}$. For the reverse osmosis to take place identify the correct condition} (Here $\mathrm{p}_{1}$ and $\mathrm{p}_{2}$ are pressures applied on chamber 1 and 2 )

Three layers of liquid are flowing over a fixed solid surface as shown below. The correct order of velocity of liquid in these layers is:

Three layers of liquid are flowing over a fixed solid surface
An object experiences a greater buoyant force in seawater than in fresh water. The most likely reason for this is