Classification of fluid flow in hydraulics:
Steady flow: Flow parameters (velocity, depth) do not change with time at any given cross-section ($\partial V/\partial t = 0, \partial y/\partial t = 0$) -> (III).
Uniform flow: Flow parameters (velocity, depth) do not change along the length/space at any given instant ($\partial V/\partial s = 0$) -> (IV).
Non-uniform flow: Velocity changes from point to point along the length of flow ($\partial V/\partial s \ne 0$) -> (I).
Unsteady flow: Velocity and depth change with time at a given cross-section ($\partial V/\partial t \ne 0$) -> (II).

Range is the simplest measure of statistical dispersion, calculated as the difference between the largest (maximum) and smallest (minimum) observations in a sample:

It uses only these two extreme values and does not take into account any other intermediate data points.

Statement (I) is false: Shaft horse power (SHP) is the power delivered to the pump shaft by the motor or engine. Water horse power (WHP) is the actual hydraulic power transferred to the water. Because pump efficiency $\eta_p = \frac{\text{WHP}}{\text{SHP}} \lt 1.0$ (due to hydraulic, mechanical, and leakage losses in the pump), SHP is ALWAYS GREATER than WHP ($\text{SHP} \gt \text{WHP}$).
Statement (II) is true: For a directly coupled pump (without belt, gear, or pulley transmissions), transmission efficiency is 100%, and the brake horsepower (BHP) of the prime mover is equal to the shaft horsepower (SHP) of the pump ($\text{SHP} = \text{BHP}$).