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Magnetism and Matter · Question 21

AIPMT 2011 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

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. B is of a paramagnetic material
  2. C is of a diamagnetic material
  3. D is of a ferromagnetic material
  4. A is of a non-magnetic material

Answer

(1) B is of a paramagnetic material

Solution

As per NCERT, diamagnetic substances are feebly repelled, paramagnetic substances are feebly attracted and ferromagnetic substances are strongly attracted by a magnet.

A – diamagnetic, B – paramagnetic, C – ferromagnetic, D – non-magnetic

B is of a paramagnetic material.

Answer: (1)

AIPMT 2011 (Prelims)

Keep practising — Magnetism and Matter

2

The magnetic moment of a diamagnetic atom is

  1. much greater than one
  2. 1
  3. between zero and one
  4. equal to zero
AIPMT 2010 (Mains)
3

Electromagnets are made of soft iron because soft iron has

  1. low retentivity and high coercive force
  2. high retentivity and high coercive force
  3. low retentivity and low coercive force
  4. high retentivity and low coercive force
AIPMT 2010 (Prelims)
4

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 s in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be

  1. 1 s
  2. 2 s
  3. 3 s
  4. 4 s
AIPMT 2010 (Prelims)
5

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is

  1. repelled by the north pole and attracted by the south pole
  2. attracted by the north pole and repelled by the south pole
  3. attracted by both the poles
  4. repelled by both the poles
AIPMT 2009
6

A bar magnet having a magnetic moment of 2 104 J T-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 10-4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60 from the field is

  1. 12 J
  2. 6 J
  3. 2 J
  4. 0.6 J
AIPMT 2009
7

Curie temperature above which

  1. paramagnetic material becomes ferromagnetic material
  2. ferromagnetic material becomes diamagnetic material
  3. ferromagnetic material becomes paramagnetic material
  4. paramagnetic material becomes diamagnetic material
AIPMT 2008
8

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

  1. anti ferromagnetism
  2. no magnetic property
  3. diamagnetism
  4. paramagnetism
AIPMT 2007
9

Curie temperature is the temperature above which

  1. paramagnetic material becomes ferromagnetic material
  2. ferromagnetic material becomes diamagnetic material
  3. ferromagnetic material becomes paramagnetic material
  4. paramagnetic material becomes diamagnetic material
AIPMT 2006
10

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by d, p and f respectively, then

  1. d = 0 and p 0
  2. d 0 and p = 0
  3. p = 0 and f 0
  4. d 0 and f 0
AIPMT 2005
11

A 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
AIPMT 2003

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