One Dimensional Flow:

One dimensional flow refers to the flow of a fluid in a single direction, usually along a straight line.

Steady and Uniform Flow:

Steady and uniform flow refers to a flow that is constant and does not change with time or location. In other words, the flow rate and velocity of the fluid remains the same at all points along the flow path.

Curved Flow:

Curved flow refers to the flow of a fluid in a curved path, typically due to the presence of obstacles or changes in the flow geometry.

One Directional Flow:

One directional flow refers to the flow of a fluid in a single direction, without any change in direction or reversal of flow.

Explanation:

The correct answer to the given question is option B, which states that in one dimensional flow, the flow takes place in a straight line. This is because one dimensional flow refers to the flow of a fluid in a single direction, typically along a straight line. In such a flow, the fluid does not change direction or reverse its flow, and the flow rate and velocity remain constant at all points along the flow path.

While it is possible for fluid flow to occur in a curved path, this would not be considered one dimensional flow. Similarly, while steady and uniform flow is an idealized condition that can occur in one dimensional flow, it is not necessarily a defining characteristic of this type of flow. Thus, the correct answer to the given question is that one dimensional flow takes place in a straight line.