To study the role of contacts between adjacent granules in magnetic granular alloys on their magnetic and magneto-transport properties we model granular alloys by mixture of macroscopic beads. It has been found that magnetic moments of clusters of nickel coated polystyrene beads are not additive and depend on both the number of contacting beads and cluster configuration. The effect is mainly due to eddy currents induced in clusters during magnetization measurements in vibrating sample magnetometer. The oscillations of real and imaginary parts of impedance in mixture of magnetic beads appear at low frequencies by applying dc magnetic field. It is shown that this behavior originates from magneto-mechanical resonance for the chains of magnetic beads under combine influence of ac and dc magnetic fields.