Question

If rotate the electric motor in reverse direction it becomes generator is it true

Answer 1

If it is turbine motor so it becomes generator or if it is simple motor so it can,t be the generator

Answer 2

Yes, Practically any type of motor can also serve as a generator. A DC motor operated in reverse supplies current from the positive terminal. If an induction machine is connected to the line and run above synchronous speed, it will become a generator.