Diamagnetic substances do not have any unpaired electron. And they are magnetised in direction opposite to that of magnetic field. Hence, when they are brought to north or south pole of a bar magnet, they are repelled by poles.

Correct Option: D

Diamagnetic substances do not have any unpaired electron. And they are magnetised in direction opposite to that of magnetic field. Hence, when they are brought to north or south pole of a bar magnet, they are repelled by poles.

Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic material.

Correct Option: A

Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic material.

Beyond Curie temperature, ferromagnetic substances behaves like a paramagnetic substance.

Correct Option: D

Beyond Curie temperature, ferromagnetic substances behaves like a paramagnetic substance.

The magnetic dipole moment of diamag-netic material is zero as each of its pair of electrons have opposite spins, i.e., µ_d = 0.
Paramagnetic substances have dipole moment > 0, i.e. µ_p ≠ 0, because of excess of electrons in its molecules spinning in the same direction. ​Ferro-magnetic substances are very strong magnets and they also have permanent magnetic moment, i.e.  µ_f ≠ 0.

Correct Option: A

The magnetic dipole moment of diamag-netic material is zero as each of its pair of electrons have opposite spins, i.e., µ_d = 0.
Paramagnetic substances have dipole moment > 0, i.e. µ_p ≠ 0, because of excess of electrons in its molecules spinning in the same direction. ​Ferro-magnetic substances are very strong magnets and they also have permanent magnetic moment, i.e.  µ_f ≠ 0.

Correct Option: B