Physics · Fluid Dynamics

b) Minimum but not zero
This option suggests that the velocity of the liquid in contact with the containing vessel is the minimum but not zero. This is the correct answer. In streamlined flow, the velocity of the fluid in contact with the vessel is minimum compared to the velocity of the fluid away from the boundaries. The velocity increases as we move away from the boundary and towards the center of the flow. 

a) Zero
This option suggests that in streamlined flow, the velocity of the liquid in contact with the containing vessel is zero. However, this is not correct. In streamlined flow (also known as laminar flow), the fluid particles move smoothly in parallel layers or streamlines. The velocity of the fluid at the boundary or in contact with the vessel is not zero; it is the same as the velocity of the fluid at other points within the flow. 

b) Minimum but not zero
This option suggests that the velocity of the liquid in contact with the containing vessel is the minimum but not zero. This is the correct answer. In streamlined flow, the velocity of the fluid in contact with the vessel is minimum compared to the velocity of the fluid away from the boundaries. The velocity increases as we move away from the boundary and towards the center of the flow. 

c) Large
This option suggests that in streamlined flow, the velocity of the liquid in contact with the containing vessel is large. This is not correct. As explained in option (b), the velocity at the boundary is minimum and gradually increases as we move towards the center of the flow. 

d) Peripheral
This option suggests that in streamlined flow, the velocity of the liquid in contact with the containing vessel is peripheral. This is not a relevant description of the flow behavior. Streamlined flow is characterized by smooth, parallel layers of fluid moving in a specific direction. The term "peripheral" is not used to describe the velocity in streamlined flow.