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  • 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
Choose the correct option from the given ones:   

1. (a) and (c) only
2. (a), (b) and (c) 
3. (b) only
4. (c) only
Q1:
 51% From NCERT 
Subtopic:  Magnetic Materials |
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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.

Q2:
 87% From NCERT AIPMT - 2011
Subtopic:  Magnetic Materials |
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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)

Q3:
 69% From NCERT 
Subtopic:  Magnetic Materials |
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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) 
Q4:
 86% From NCERT 
Subtopic:  Magnetic Materials |
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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) 
Q5:
 61% From NCERT 
Subtopic:  Magnetic Materials |
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