Question

distinguish bw para dia and ferro magnetic material

Answer 1

All substances are magnetic (have certain magnetic properties). For most substances, the magnetic permeability μ is close to one.Substances for which the magnetic permeability slightly less than unity (μ<1), called diamagnetically slightly greater than unity (μ>1) with paramagnetic materials. Substances, the magnetic permeability of which can greatly exceed one (µ >> 1) are called ferromagnets.
Examples of diamagnetics are lead, zinc, bismuth (μ = 0,9998); paramagnetic — sodium, oxygen, aluminum (μ = 1,00023); ferromagnetic materials — cobalt, nickel, iron (μ reaches a value of 8⋅103).

Answer 2

PARA MAGNETIC : they are feebly attracted by a magnet,                                                                examples:aluminum ,platinum,manganese,chromium,calcium,oxygen,nitrogen(at STP)                      DIA MAGNETIC:they are feebly repelled by a magnet,                                         examples:Bismuth,copper, silicon,lead,water,glass ....            FERRO MAGNET:they are strongly attracted by a magnet,                                 examples:iron, cobalt,nickel&alloys like alnico