A particle is rel

Yes, the kinetic energy depends on the angle(theta) of the incline. when the particle is placed on the top of the incline at height h.
It possesses potential energy,

After travelling along the surface of the incline at the bottom All the potential energy it had has now been converted into kinetic energy. Therefore, Kinetic energy at the bottom,

Hence, As the incline angle changes the kinetic energy also changes accordingly.