Q. No.Choose the correct statement regarding magnetism.
| 1. | Paramagnetic sample displays greater magnetization when cooled. |
| 2. | Diamagnetism is almost independent of temperature. |
| 3. | Ferromagnetic substances show hysteresis. |
| 4. | All of these. |
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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?
| 1. | C is of a diamagnetic material |
| 2. | D is of a ferromagnetic material |
| 3. | A is of a non-magnetic material |
| 4. | B is of a paramagnetic material |
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If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:
| 1. | repelled by both the poles |
| 2. | repelled by the north pole and attracted by the south pole |
| 3. | attracted by the north pole and repelled by the south pole |
| 4. | attracted by both the poles |
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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by \(\mu_d,~\mu_p,~\text{and}~\mu_f\) respectively, then:
1. \(\mu_p= 0 ~\text{and}~\mu_f \ne0\)
2. \(\mu_d\neq 0 ~\text{and}~\mu_p=0\)
3. \(\mu_d\ne 0 ~\text{and}~\mu_f \ne0\)
4. \(\mu_d= 0 ~\text{and}~\mu_p \ne0\)
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Diamagnetic material in a magnetic field moves:
| 1. | from stronger to the weaker parts of the field |
| 2. | from weaker to the stronger parts of the field |
| 3. | perpendicular to the field |
| 4. | in none of the above directions |
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The material which is used to make permanent magnet has:
| 1. | High retentivity, low coercivity |
| 2. | Low retentivity, low coercivity |
| 3. | Low retentivity, high coercivity |
| 4. | High retentivity, high coercivity |
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The possible value of magnetic susceptibility of a diamagnetic material can be:
1. \(-2.45\)
2. \(0.75\)
3. \(-0.5\)
4. \(1.67\)
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The magnetic susceptibility \(\chi\) of a diamagnetic material depends on absolute temperature \(T\) as:
1. \(\chi \propto T\)
2. \(\chi \propto \frac{1}{T}\)
3. \(\chi \propto T^0\)
4. \(\chi \propto \frac{1}{\sqrt{T}}\)
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The variation of the intensity of magnetisation \((I)\) with respect to the magnetising field \((H)\) in a diamagnetic substance is described by the graph:
| 1. | \(OD\) | 2. | \(OC\) |
| 3. | \(OB\) | 4. | \(OA\) |
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Select the incorrect statement regarding magnetic material.
| 1. | The magnetic dipole moment of each atom of para and ferromagnetic substance is zero and that of diamagnetic material is non-zero in the absence of external magnetizing force |
| 2. | When the diamagnetic substance is brought near the north or south pole of a bar magnet, it is repelled |
| 3. | Magnetic susceptibility of diamagnetic substances is temperature independent and that of para and ferromagnetic substances is temperature-dependent |
| 4. | All of these |
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