ANS:A - stream line flow

The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other is called a streamline flow. In streamline flow, the fluid moves smoothly and predictably, with layers of fluid moving parallel to each other. This type of flow is characterized by the absence of turbulence and chaotic motion. Each particle follows a well-defined path called a streamline, and adjacent streamlines do not intersect. The other options mentioned are different types of flows:

• Uniform flow: Uniform flow refers to a type of flow where the velocity of the fluid remains constant at every point across the cross-section of the flow.
• Steady flow: Steady flow is a type of flow where the velocity and other flow parameters (such as pressure, density, and temperature) at any point in the fluid do not change with time. The flow may be uniform or non-uniform, but it remains constant with time.
• Turbulent flow: Turbulent flow is characterized by irregular and chaotic motion of fluid particles. In turbulent flow, eddies and vortices form, causing mixing and random fluctuations in velocity, pressure, and other flow properties. Turbulent flow often occurs at high velocities or in conditions where there are obstacles or irregularities in the flow path.