Question

Steady flow occurs when:
$A.$ Condition do not change with at any point
$B.$ Conditions are the same at adjacent points at any instant
$C.$ Conditions change steadily with the time
$D.$ None of these

Answer 1

The movement of liquids and gases is generally referred to as flow, a concept that describes how fluids behave and how they interact with their surrounding environment, for example, water moving through a pipe.

Complete step by step answer:
In steady flow, the fluid is in motion but the streamlines are fixed. In steady flow the streamline crowd together and the fluid velocity is relatively high.
Condition of steady flow: When all the time derivatives of a flow field vanish, the flow is considered steady flow. Steady flow refers to the condition where the fluid properties at a point in the system do not change at any time.

So, the correct option is $A$ , that is, conditions do not change at any point.

Additional information:
There are many types of flow of fluid namely,
-Steady flow: In steady flow velocity, acceleration of fluid does not change with respect to time.
-Unsteady flow: In this flow velocity, acceleration changes with respect to time.
-Uniform flow: In the type of flow parameter such as velocity, acceleration of a fluid does not change with respect to space.
-Non uniform Flow: velocity and acceleration of a fluid change with respect to space.
-Laminar flow: The flow in which fluids flow smoothly such that fluid layers are parallel to each other or no streamlines intersect each other, this type of flow is known as laminar flow.
-Streamline flow: The flow in which velocity is constant or varies with regular manner, such type of flow is known as streamline flow.

Note:
It is to be noted that steady-state flow refers to the condition where the fluid properties at any single point in the system do not change over time. These fluid properties include temperature, pressure, and velocity.