1. The problem asks whether the statement "If a system is in rotational equilibrium, the Torque acting on the system must be non-zero" is true or false. 2. Recall the definition of rotational equilibrium: A system is in rotational equilibrium if the net torque acting on it is zero. 3. Torque ($\tau$) is the rotational equivalent of force and causes objects to rotate. For equilibrium, the sum of all torques must be zero, meaning no net rotational acceleration. 4. Therefore, the statement "Torque must be non-zero" is incorrect because for rotational equilibrium, the net torque must be zero. 5. Final answer: False.