Magnetism And Matter Mock Test

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Quiz: Magnetism and Matter – Progressive Test
Total questions: 420
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 9
Current round: 1^st
Rounds passed: 0 / 9
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Rounds attempted: 0

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Quiz: Magnetism and Matter – Certificate Challenge
Total questions: 420
Questions to attempt: 100 random
Time allotted: 100 minutes
Certificate pass score: 70%
Random questions: Yes
Certificate: Yes
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Progressive Test — Guest First Round

Magnetism and Matter – Progressive Test

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1 / 50

1. A material has a high value of coercivity but only moderate retentivity. Its high coercivity mainly means that

a) its magnetisation is always opposite to

b) it has no hysteresis loop

c) needs a large reverse to demagnetise

d) it is automatically the best transformer core

2 / 50

2. The dimensional expression of magnetic intensity , given that its SI unit is , is

3 / 50

3. Study the table and select the row that best describes magnetic shielding.

Row	Shield material	Effect on enclosed region
P	High-permeability ferromagnetic material	Magnetic field inside is reduced
Q	Low-permeability non-magnetic material	All magnetic field lines must vanish
R	High-permeability material	Magnetic field inside must become infinite
S	Material with only	Strong permanent magnet shielding always occurs

a) Row R

b) Row S

c) Row Q

d) Row P

4 / 50

4. A short magnetic dipole has axial field at a distance . Another dipole has twice the magnetic moment and is observed at distance on its axial line. Compared with , the new field is

5 / 50

5. A hysteresis graph for a material has a large vertical intercept when , a large reverse -intercept where , and a large enclosed area. The most consistent interpretation is that the material is suitable for

a) magnetic shielding only, because large loop area means no retained magnetism

b) permanent magnets, because it has high retentivity and high coercivity

c) transformer cores, because it has the smallest possible hysteresis loss

d) diamagnetic levitation only, because its susceptibility must be negative

6 / 50

6. A short magnetic dipole of moment has an axial field at distance . Another dipole has moment . At what axial distance from the second dipole will the axial field again be ?

7 / 50

7. A magnetic dipole is placed in a uniform magnetic field. In one case, is parallel to ; in another case, is antiparallel to . The torque magnitudes in the two cases are

a) maximum in both cases

b) maximum in the parallel case and zero in the antiparallel case

c) zero in the parallel case and maximum in the antiparallel case

d) zero in both cases

8 / 50

8. A short magnet is placed with . At a point on the axial line, the magnet's field and Earth's horizontal field are

a) both absent because the point is axial

b) in the same direction, so a neutral point is not formed there

c) in opposite directions, so a neutral point must be formed at every axial point

d) perpendicular, so the resultant is always zero

9 / 50

9. A short bar magnet has magnetic length and pole strength . It is placed with , where . Taking , the equatorial neutral distance is

10 / 50

10. A current loop of magnetic moment is placed in a uniform magnetic field . When the loop is turned from to , the change in potential energy is

11 / 50

11. A dip needle shows , while the horizontal component of Earth's magnetic field is . The total field is

12 / 50

12. A graph of magnetisation against magnetic intensity for a ferromagnetic material is described below.

Starting from the unmagnetised state, rises rapidly for small , then rises more slowly, and finally becomes nearly constant even when is increased further.

The nearly constant part of the graph represents

a) neutral point formation

b) zero susceptibility for all fields

c) magnetic saturation

d) magnetic declination

13 / 50

13. Use the arrangement described below.

A sensitive galvanometer is placed inside a hollow soft iron box. An external magnetic field is applied outside the box. Field lines are found to be much denser in the iron wall than inside the hollow space.

The main purpose of the soft iron box is to

a) make the galvanometer retain permanent magnetisation

b) guide field lines through the wall and reduce the inside field

c) convert magnetic field lines into electric charge at the wall

d) force field lines through the hollow space and increase the inside field

14 / 50

14. A comparison of two cores is shown below.

Core	Permeability	Retentivity	Coercivity	Preferred use
P	High	Low	Low	Electromagnet core
Q	High	High	High	Permanent magnet
R	Low	Low	High	Transformer core
S	High	Low	Low	Transformer core

The row that is least suitable is

a) Row P

b) Row R

c) Row Q

d) Row S

15 / 50

15. The direction of the magnetic dipole moment of a bar magnet is taken

a) from to inside the magnet

b) from to inside the magnet

c) opposite to the axis at both poles

d) perpendicular to the magnetic axis

16 / 50

16. A compass placed at two different towns does not point at exactly the same angle relative to geographic north. The most suitable reason is that

a) geographic north changes position every hour

b) a compass needle has no magnetic moment

c) magnetic field lines cannot exist near Earth

d) Earth's magnetic field has local variation

17 / 50

17. A graph is drawn for a short magnetic dipole with on the vertical axis and on the horizontal axis, keeping constant.

The plotted points lie on a straight line through the origin.

The straight-line nature shows that

d) is independent of

18 / 50

18. In a field-line diagram of a bar magnet, the lines are symmetric about the magnetic axis. This symmetry mainly suggests that

a) field lines intersect at the centre of the magnet

b) the magnet has no poles

c) the field is zero at all points on the magnetic axis

d) opposite sides show mirror-like field patterns

19 / 50

19. Two small magnetic needles are placed at different points near a bar magnet. Needle P turns more strongly and settles quickly, while needle Q turns weakly. The better inference is that

a) magnetic field has no direction at P

b) magnetic field exists only at Q

c) magnetic field is stronger at P than at Q

d) needle P has changed into an electric charge

20 / 50

20. In the early part of a ferromagnetic magnetisation curve, the rapid increase of with is mainly due to

a) formation of isolated magnetic monopoles

b) growth and alignment of favourable domains

c) disappearance of all microscopic magnetic moments

d) conversion of magnetic field into electric field

21 / 50

21. Consider the following statements about magnetic materials used in devices.
Statement I: Permanent magnets require high retentivity.
Statement II: Transformer cores require low hysteresis loss.
Statement III: Electromagnet cores should have high coercivity so that magnetisation remains after switching off.

a) I and II only

b) II and III only

c) I and III only

d) I, II and III

22 / 50

22. Relative permeability is defined as

23 / 50

23. A material has when . Taking , the approximate relative permeability and susceptibility are

24 / 50

24. A magnetic material has and . Its volume is . Taking , the magnetisation, net magnetic moment, and magnetic field inside the material are respectively

a) , ,

b) , ,

c) , ,

d) , ,

25 / 50

25. A graph of magnetic susceptibility against absolute temperature is drawn for an ideal paramagnetic material obeying Curie's law.

As increases, decreases in such a way that remains constant.

The graph is best described by

a) independent of

26 / 50

26. A short magnet is placed with opposite to . Its axial neutral-point distance is . If the magnetic moment is increased to , with unchanged, the new axial neutral distance is

27 / 50

27. A bar magnet is replaced by a current loop with the same magnetic moment . At a far equatorial point at the same distance and same orientation, the magnetic field

a) points along for the loop but opposite to for the magnet

b) has the same far-field dipole value as the bar magnet

c) becomes independent of distance

d) becomes zero only for the current loop

28 / 50

28. A paramagnetic material obeys Curie's law. Its magnetising field is doubled while its absolute temperature is tripled. Compared with the original magnetisation, the new magnetisation is

a) of the original value

b) of the original value

c) times the original value

d) times the original value

29 / 50

29. A paramagnetic material obeys Curie's law. At , its susceptibility is . The magnetising field is then doubled while the temperature is raised to . Compared with the original magnetisation, the new magnetisation is

a) the same

b) half as large

c) one-fourth as large

d) twice as large

30 / 50

30. The pole-pair nature of a bar magnet means that the magnet is best described as

a) an electric dipole only

b) a magnetic dipole

c) a single north pole

d) a magnetic monopole

31 / 50

31. A diamagnetic material is placed in an external magnetic field. Its induced magnetisation is

a) zero only because atoms have no electrons

b) weakly opposite to the applied field

c) strongly along the applied field

d) independent of the applied field direction

32 / 50

32. A naturally occurring magnetic mineral that can attract small pieces of iron is best described as

a) a non-magnetic insulator

b) a demagnetised material

c) a natural magnet

d) an artificial magnet

33 / 50

33. Magnetisation of a material describes

a) resistance per unit length of the material

b) electric charge per unit area of the material

c) magnetic moment per unit volume of the material

d) magnetic flux through a closed surface only

34 / 50

34. The equatorial field setup differs from the axial field setup mainly because

a) the equatorial field is produced by only one pole

b) an equatorial point is equally distant from both poles

c) the equatorial point has no magnetic field under any condition

d) the axial point is always equally distant from both poles

35 / 50

35. A material has . In a region where is along , the magnetisation direction and are

a) along ,

b) along ,

c) along ,

d) along ,

36 / 50

36. A short magnetic dipole has moment . At distance , an axial point and an equatorial point are considered. If the direction of is taken as positive, the signed fields may be represented as

a) ,

b) ,

c) ,

d) ,

37 / 50

37. Assertion: At the same distance from a short magnetic dipole, the axial field magnitude is twice the equatorial field magnitude.
Reason: The axial field is directed along , while the equatorial field is directed opposite to .

a) Both are true, but Reason is not the explanation

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Assertion is false, but Reason is true

d) Assertion is true, but Reason is false

38 / 50

38. A magnetic dipole with is placed in a uniform field . It is slowly rotated from to . The work done by an external agent is

39 / 50

39. The angle of dip at a place is the angle made by Earth's magnetic field with

a) the horizontal direction

b) the east-west line only

c) the magnetic axis of a bar magnet in a laboratory

d) the geographic meridian only

40 / 50

40. At a place, Earth's total magnetic field is and the dip angle is . A short bar magnet of moment is placed with . Taking , the distance of an equatorial neutral point from the magnet's centre is approximately

41 / 50

41. Near the pole of a bar magnet, field lines are drawn closer together than in a region far away from the magnet. This represents that the magnetic field near the pole is

a) weaker because lines are crowded

b) stronger because lines are crowded

c) zero because many lines cancel

d) scalar because lines are curved

42 / 50

42. A magnetic dipole in a uniform field has zero torque at two different orientations. A student concludes that both orientations must be equally stable. The best correction is that

a) both have maximum torque and minimum energy

b) is stable, while is unstable

c) both are maximum-energy stable positions

d) is stable, while is unstable

43 / 50

43. A diamagnetic material and a paramagnetic material are placed one by one in the same non-uniform magnetic field. Which row gives the correct comparison?

Row	Diamagnetic material	Paramagnetic material
P	Weakly repelled from stronger field	Weakly attracted toward stronger field
Q	Strongly attracted toward stronger field	Weakly repelled from stronger field
R
S

a) Row S

b) Row R

c) Row Q

d) Row P

44 / 50

44. In deriving the axial field of a short magnetic dipole, the two pole contributions are subtracted rather than simply added because

a) the pole fields oppose at an external axial point

b) both poles are at the same distance from the axial point

c) the magnetic moment of the magnet is zero

d) magnetic field is a scalar on the axis

45 / 50

45. A freely suspended compass needle settles approximately along the geographic north-south direction because Earth has

a) no magnetic field around it

b) a magnetic field only inside its core and nowhere outside

c) only an electric field near its surface

d) an approximate magnetic field like a giant dipole

46 / 50

46. A magnetic shield is made thicker using the same high-permeability material. In a qualitative design sense, the shielding usually improves because

a) magnetic field lines are forced to end permanently inside the shield

b) Gauss's law for magnetism stops applying

c) it offers an easier high-permeability path for magnetic flux

d) the enclosed instrument becomes a magnetic monopole

47 / 50

47. A short magnetic dipole has directed east. At a point on its equatorial line, the magnetic field is directed

a) north

b) east

c) vertically upward

d) west

48 / 50

48. Magnetic field lines outside a bar magnet are directed

a) from to

b) only in circular paths around one pole

c) only perpendicular to the magnetic axis

d) from to

49 / 50

49. A circular loop of radius carries a current . Its magnetic dipole moment is

50 / 50

50. A graph is plotted for a linear magnetic material with on the vertical axis and on the horizontal axis.

The graph is a straight line through the origin, and its slope is small and positive.

The material is best described as

a) diamagnetic with negative susceptibility

b) a material with dimensioned susceptibility

c) paramagnetic with small positive

d) ferromagnetic with no magnetic domains

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Magnetism and Matter Mock Test – Class 12 Physics

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