Magnetic Properties of Matter - NEET Physics Chapterwise MCQs & PYQs
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NEET Magnetic Properties of Matter MCQs & PYQs
Practice NEET Magnetic Properties of Matter Questions
Question 51:
easy
22. There are four light weight rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:
(i) A is feebly repelled
(ii) B is feebly attracted
(iii) C is strongly attracted
(iv) D remains unaffected
Which one of the following is true? (2011 Pre)
Diamagnetic materials (A) are feebly repelled. Paramagnetic materials (B) are feebly attracted. Ferromagnetic materials (C) are strongly attracted. Non-magnetic materials (D) remain unaffected. Hence, B is paramagnetic.
23. The magnetic moment of a diamagnetic atom is: (2010 Mains)
In diamagnetic materials, electrons occur in pairs with opposite spins and their orbital motions cancel each other out. Thus, their individual magnetic moments cancel, resulting in a net magnetic moment equal to zero for the atom.
24. If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is: (2009)
Diamagnetic substances always move from stronger parts to weaker parts of a non-uniform magnetic field. Therefore, they are repelled by both the north and south poles of a bar magnet.
25. If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $\mu_{d}$, $\mu_{p}$ and $\mu_{f}$ respectively, then (2005)
Diamagnetic atoms have completely paired electrons, meaning no permanent magnetic dipole moment, so $\mu_{d} = 0$. Paramagnetic and ferromagnetic atoms have unpaired electrons and possess permanent dipole moments, so $\mu_{p} \neq 0$ and $\mu_{f} \neq 0$.
26. Diamagnetic material in a magnetic field moves: (2003)
Diamagnetic materials get magnetized in the opposite direction to the applied external magnetic field. Because of this repulsion, they experience a net force moving them from the stronger region to the weaker region of the field.
27. Among which the magnetic susceptibility does not depend on the temperature: (2001)
According to Curie's law, the susceptibility of paramagnetic and ferromagnetic materials varies inversely with temperature. However, the magnetic susceptibility of diamagnetic materials is practically independent of temperature.
28. For protecting a magnetic needle it should be placed: (1998)
Soft iron is a ferromagnetic material with high permeability. When an iron box is placed in an external magnetic field, most of the magnetic field lines pass through the walls of the box, shielding the inside space.
29. Electromagnets are made of soft iron because soft iron has: (2010 Pre)
Electromagnets require a material that gets magnetized easily and quickly loses its magnetism when the current is turned off. Soft iron is ideal because it has low retentivity and low coercive force.
30. Curie temperature is the temperature above which: (2008)
At the Curie temperature, the thermal agitation overcomes the exchange interaction between atomic dipoles that align them. Above this temperature, the ferromagnetic material loses its spontaneous magnetization and behaves as a paramagnetic material.
31. Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show: (2007)
Nickel is a ferromagnetic material. When heated above its Curie temperature, the magnetic domain structure breaks down due to thermal agitation, transforming it into a paramagnetic substance.