- 1(current)
Q. No.When cooled below \(4.2\) K, mercury becomes a superconductor, which means it has no electrical resistance. When a current is passed through mercury under these conditions, which one of the following effects will be present?
(a) thermal
(b) chemical
(c) magnetic
| 1. | (a) and (c) only |
| 2. | (a), (b) and (c) |
| 3. | (b) only |
| 4. | (c) only |
Subtopic: Â Magnetic Materials |
From NCERT
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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. |
Subtopic: Â Magnetic Materials |
 87%
From NCERT
AIPMT - 2011
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NEET 2023 - Target Batch - Aryan Raj Singh
Given below are two statements:
| Statement I: | All paramagnetic substances become diamagnetic as their temperature is lowered. |
| Statement II: | All ferromagnetic substances become paramagnetic when their temperature is lowered. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Â Magnetic Materials |
 55%
From NCERT
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Soft iron is used to manufacture electromagnets because:
1. It has a high permeability.
2. Its retentivity and coercivity are small.
3. Its retentivity and coercivity are high.
4. Both (1) & (2)
Subtopic: Â Magnetic Materials |
 69%
From NCERT
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Links
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NEET 2023 - Target Batch - Aryan Raj Singh
To make the electromagnets, the material used should have:
| 1. | low hysteresis loss | 2. | high hysteresis loss |
| 3. | high permeability | 4. | both (1) and (3) |
Subtopic: Â Magnetic Materials |
 86%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
To make the permanent magnets, the material used should have:
1. low hysteresis loss
2. high hysteresis loss
3. high retentivity and coercivity
4. both (2) and (3)
1. low hysteresis loss
2. high hysteresis loss
3. high retentivity and coercivity
4. both (2) and (3)
Subtopic: Â Magnetic Materials |
 60%
From NCERT
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- 1(current)
Q. No.
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