ANS:C - 5 to 7 times its height

The statement "5 to 7 times its height" is not accurate for the length of a hydraulic jump. The length of a hydraulic jump is typically not as large as 5 to 7 times its height. In practical scenarios and empirical observations, the length of a hydraulic jump is generally observed to be approximately 2 to 3 times its height. This relationship may vary depending on factors such as the initial flow conditions, channel geometry, and roughness. The length of the hydraulic jump is influenced by the energy dissipation processes that occur during the transition from supercritical flow to subcritical flow. It involves the conversion of kinetic energy into turbulent kinetic energy and the associated energy losses. Therefore, the correct understanding is that the length of a hydraulic jump is roughly 2 to 3 times its height, rather than 5 to 7 times its height.