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Ch–05 : MAGNETISM AND MATTER

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

Unit of magnetic dipole moment is

a)

ampere meter

b)

ampere/meter⁻¹

c)

ampere metre²

d)

ampere/metre²

2.

The angle between magnetic axis and geographic axis of earth is

a)

90°

b)

10°

c)

11°

d)

11.3°

3.

At magnetic poles, the angle of dip is

a)

45°

b)

30°

c)

90°

d)

0°

4.

A bar magnet of dipole moment 'm' cut into two equal pieces transverse to its length. Dipole moment of each part is

a)

Remain same

b)

m/2

c)

2m

d)

none of the above

5.

A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be

a)

M/A

b)

A/M

c)

MA

d)

A^2M

6.

A current loop placed in a magnetic field behaves like a

a)

Magnetic substance

b)

Magnetic pole

c)

Magnetic dipole

d)

all true

7.

A steel wire of length l has a magnetic moment M. It is then bent into a semicircular arc. The new magnetic moment is

a)

M

b)

2M/π

c)

M/l

d)

Ml

8.

If the angle of dip at two places are 30° and 45° respectively, then the ratio of horizontal components of the earth’s magnetic field at the two places will be

a)

√3/√2

b)

1/√2

c)

1/√3

d)

1/2

9.

A dip circle is so set that it moves freely in the magnetic meridian. The angle of dip is 40°. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30° with the magnetic meridian. In this position, the needle will dip by the angle

a)

40°

b)

30°

c)

more than 40°

d)

less than 40°

10.

A compass needle whose magnetic moment is 60 Am² pointing geographical north at a certain place, where the horizontal component of the earth’s magnetic field is 40 μWb m⁻², experiences a torque 1.2 x 10⁻³ Nm. The declination at this place is

a)

30°

b)

45°

c)

60°

d)

25°

11.

In a permanent magnet at room temperature,

a)

magnetic moment of each molecule is zero

b)

the individual molecules have non-zero magnetic moment which are all perfectly aligned

c)

domains are partially aligned

d)

domains are all perfectly aligned.

12.

Magnetic field lines form continuous closed loops

a)

magnet is always a dipole

b)

magnet is always a monopole

c)

magnetic material is permeable

d)

none of the above

13.

The direction of magnetic dipole moment is always from

a)

North pole to south pole

b)

Away from North pole outside magnet

c)

South pole to North Pole

d)

all of the above

14.

The ratio of magnetic length to geometric length of a magnet is

a)

0.084

b)

8.4

c)

80.4

d)

0.84

15.

If a magnet is cut perpendicular its length into equal parts, then the pole strength of each pole of the magnet

a)

becomes double

b)

remains same

c)

becomes half

d)

None of the above

16.

The earth behaves as a magnet with magnetic field pointing approximately from the geographic

a)

North to South

b)

South to North

c)

East to West

d)

West to East

17.

The strength of the earth's magnetic field is

a)

constant everywhere.

b)

zero everywhere.

c)

having very high value.

d)

vary from place to place on the earth's surface.

18.

Which of the following independent quantities is not used to specify the earth's magnetic field?

a)

Magnetic declination (θ).

b)

Magnetic dip (δ).

c)

Horizontal component of earth's field (BH).

d)

Vertical component of earth's field (BV).

19.

The angle of dip at a certain place where the horizontal and vertical components of the earth's magnetic field are equal is

a)

30°

b)

75°

c)

60°

d)

45°

20.

The vertical component of earth's magnetic field at a place is √3 times the horizontal component. The value of angle of dip at this place is

a)

30°

b)

45°

c)

60°

d)

90°

21.

At a given place on earth's surface the horizontal component of earth's magnetic field is 2 × 10^{-35} T and resultant magnetic field is 4 × 10^{-35} T. The angle of dip at this place is

a)

30°

b)

60°

c)

90°

d)

45°

22.

Which of the following properties shows the property of ferromagnetic substances?

a)

The ferromagnetic property depends on temperature.

b)

The ferromagnetic property does not depend on temperature.

c)

At high enough temperature ferromagnet becomes a diamagnet.

d)

At low temperature ferromagnet becomes a paramagnet.

23.

The primary origin of magnetism lies in

a)

atomic current and intrinsic spin of electrons.

b)

polar and nonpolar nature of molecules.

c)

Pauli exclusion principle.

d)

electronegative nature of materials.

24.

Magnetic moment for solenoid and corresponding bar magnet is

a)

equal for both

b)

more for solenoid

c)

more for bar magnet

d)

none of these

25.

Which of the following is correct about a magnetic monopole?

a)

Magnetic monopole exists.

b)

Magnetic monopole does not exist.

c)

Magnetic monopole has constant value of monopole momentum.

d)

The monopole momentum increases due to increase at its distance from the field.

26.

The net magnetic flux through any closed surface, kept in a magnetic field is

a)

zero

b)

μ₀4π

c)

4μ₀

d)

4μ₀π

27.

S.I. unit of flux is :

a)

Ohm

b)

Weber

c)

Tesla

d)

None

28.

The dimensional representation of magnetic flux density is:

a)

[MLT⁻²]

b)

[MLT⁻² A⁻¹]

29.

A magnetic bar of M magnetic moment is placed in the field of magnetic strength B, the torque acting on it is:

a)

(a) M⃗⋅B⃗\vec{M} \cdot \vec{B}

b)

(b) −M⃗⋅B⃗-\vec{M} \cdot \vec{B}

c)

(c) M⃗×B⃗\vec{M} \times \vec{B}

d)

(d) B⃗×M⃗\vec{B} \times \vec{M}

30.

The magnetic lines of force inside a bar magnet:

a)

do not exist

b)

depends on area of cross-section of bar magnet

c)

are from N-pole to S-pole of the magnet

d)

are from S-pole to N-pole of the magnet.

31.

The unit of pole strength is

a)

Am⁻¹

b)

Am

c)

Am⁻²

d)

Am²

32.

Two identical magnets each of dipole moment M and length 2l are perpendicular to each other. The dipole moment of the combination is:

a)

√2 M

b)

2M

c)

M/√2

d)

2M

33.

Magnetic dipole moment is a vector quantity directed from

a)

south to north

b)

north to south

c)

east to west

d)

west to east

34.

The magnetic dipole moment of a current loop is independent of

a)

magnetic field in which it is lying

b)

number of turns

c)

area of the loop

d)

current in the loop

35.

An electron moving around the nucleus with an angular momentum l has a magnetic moment.

a)

e l / m

b)

e l / 2m

c)

2e l / m

d)

e / 2m l

36.

The gyromagnetic ratio of an electron of charge e and mass m is equal to-

a)

e2/2me^2 / 2m

b)

e/2m2e / 2m^2

c)

e / 4m

d)

e / 2m

37.

At the magnetic north pole of the earth, the value of the horizontal component of earth’s magnetic field and angle of dip are respectively-

a)

zero, maximum

b)

maximum, minimum

c)

maximum, maximum

d)

minimum, minimum

38.

At a given place on the earth’s surface, the horizontal component of earth’s magnetic field is 3 x 10^{-5} T and resultant magnetic field is 6 x 10^{-5} T. The angle of dip at this place is

a)

30°

b)

40°

c)

50°

d)

60°

39.

A coil of N turns and radius R carries a current I. It is unwound and rewound to make a square coil of side 'a' having same number of turns N. Keeping the current I same, the ratio of the magnetic moments of the circular coil and the square coil is

a)

πR²/a²

b)

πa²/R²

c)

R²/a²

d)

None of the above

40.

At the same place, the horizontal component of earth’s magnetic field is 0.40G and the angle of dip is 30°. What is the resultant magnetic field?

a)

0.46G

b)

0.36G

c)

0.12G

d)

0.14G

41.

Angle of dip is maximum at-

a)

pole

b)

equator

c)

Both (a) and (b)

d)

Neither (a) nor (b)

42.

A current loop behaves as a system of __________. As a result, it acts like a magnetic dipole.

a)

magnetic pole

b)

charges

c)

both (a) and (b)

d)

None of these

43.

The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11.3° with the axis of the earth. At Mumbai, declination is nearly zero. Then,

a)

the declination varies between 11.3°W to 11.3°E

b)

the least declination is 0°

c)

the plane defined by dipole axis and the earth axis passes through Greenwich.

d)

declination averaged over the earth must be always negative.

44.

At a certain place on earth, BH=√3 BV angle of dip at this place is

a)

(a) 60°

b)

(b) 30°

c)

(c) 45°

d)

(d) 90°

45.

The angle between Magnetic meridian and the geographic meridian is known as

a)

Angle of dip

b)

magnetic field inclination

c)

Magnetic field declination

d)

angle of magnetism

46.

Which of the following are the Elements of Earth’s magnetic fields?

a)

(i), (ii) and (iii)

b)

(i), (ii) and (iv)

c)

(ii), (iii) and (iv)

d)

(i), (iii) and (iv)

47.

Where on the surface of Earth is the vertical component of Earth’s magnetic field zero?

a)

at north pole

b)

at South pole

c)

at Equator

d)

none of these

48.

A small magnet is pivoted to move freely in the magnetic meridian. At what place on the surface of the earth will the magnet be vertical?

a)

at pole

b)

at the place where angle of dip is 45°

c)

at Equator

d)

none of these

49.

Which of the following are true

a)

(i), (ii) and (iii)

b)

(i), (ii) and (iv)

c)

(ii), (iii) and (iv)

d)

(i), (iii) and (iv)

50.

At the place the horizontal component of magnetic field is B and angle of dip is 60°, the value of the horizontal component of magnetic field at equator is

a)

B

b)

zero

c)

2B

d)

B/2

51.

The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11.3° with the axis of the earth. At Mumbai, declination is nearly zero. Then,

a)

the declination varies between 11.3° W to 11.3° E

b)

the least declination is 0°

c)

the plane defined by dipole axis and the earth axis passes through Greenwich

d)

declination averaged over the earth must be always negative

52.

In a permanent magnet at room temperature,

a)

magnetic moment of each molecule is zero

b)

the individual molecules have non-zero magnetic moment which are all perfectly aligned

c)

domains are partially aligned

d)

domains are all perfectly aligned

53.

A paramagnetic sample shows a net magnetisation of 8 Am⁻¹ when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16 K, the magnetisation will be

a)

3/2 Am⁻¹

b)

2/3 Am⁻¹

c)

6 Am⁻¹

d)

2.4 Am⁻¹

54.

A ferromagnetic material is heated above its curie temperature. Which one is a correct statement?

a)

Ferromagnetic domains are not influenced.

b)

Ferromagnetic domains are perfectly arranged.

c)

Ferromagnetic domains become random.

d)

Ferromagnetic material changes into diamagnetic material.

55.

The time period of a thin bar magnet in earth’s magnetic field is T. If the magnet is cut into two equal parts perpendicular to its length, the time period of each part in the same field will be

a)

T/2

b)

T

c)

1.414T

56.

A magnet of magnetic moment 50i A·m² is placed along the x-axis in a magnetic field B = (0.5i + 3.0j)T. The torque acting on the magnet is

a)

175 k̂ N·m

b)

150 k̂ N·m

c)

75 k̂ N·m

d)

25√37 k̂ N·m

57.

Which of the following relation is correct?

a)

B = BV × BH

b)

B = BV / BH

c)

B = BV + BH

d)

B = (BV² + BH²)¹/²

58.

Lines which represent places of constant angle of dip are called

a)

Isobaric lines

b)

Isogonic lines

c)

Isoclinic lines

d)

Isodynamic lines

59.

A magnetic needle is kept in a non-uniform magnetic field experiences

a)

a force as well as a torque

b)

a torque but not a force

c)

a force and a torque

d)

a force but not a torque

60.

The Time period of freely suspended bar magnet is independent of

a)

Horizontal component of earth’s magnetic field

b)

Length of bar magnet

c)

Length of the suspension

d)

Moment of inertia of the bar magnet

61.

Angle of dip maximum at

a)

Pole

b)

Equator

c)

Both (a) & (b)

d)

Neither (a) nor (b)

62.

Earth’s magnetic field inside a closed iron box, as compared to outside is

a)

More

b)

Less

c)

Same

d)

zero

63.

At present, north magnetic pole is located at a :

a)

latitude of 79.74° N and a longitude of 71.8° W

b)

latitude of 71.8° N and a longitude of 79.74° W

c)

latitude of 79.74° S and a longitude of 108.22° E

d)

latitude of 108.22° S and a longitude of 79.74° E

64.

The dimensional formula permeability is:

a)

[MLT⁻²A²]

b)

[MLT²A²]

c)

[ML²T⁻²A⁻²]

d)

[MLT⁻²A]

65.

The relative permeability of free space is

a)

zero

b)

one

c)

Infinite

d)

None of these

66.

The dimensional representation of magnetic flux density is :

a)

[MLT⁻²]

b)

[MLT⁻²A⁻¹]

c)

[MLT⁻²A²⁻¹]

d)

[MT⁻²A⁻¹]

67.

Tangent law is applicable only when:

a)

two uniform and mutually perpendicular magnetic fields exist

b)

two magnetic fields exist

c)

horizontal component of earth’s magnetic field is present

d)

uniform magnetic field are used

68.

The magnetic field of earth is due to:

a)

induction effect of the sun

b)

the presence of a large magnet at the centre of the earth

c)

interaction of cosmic rays with the current of earth

d)

motion and distribution of some material in and outside the earth

69.

The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:

a)

zero

b)

more than that of earth

c)

less than that of earth

d)

equal to that of earth

70.

The relation between geometric length (L) and magnetic length (Lm) is:

a)

Lm = 5/6 Lg

b)

Lm = 6/5 Lg

c)

Lm = Lg

d)

Lm = 2Lg

71.

What is the value of angle of dip at the magnetic equator?

a)

0°

b)

90°

c)

45°

d)

Nearly 30°

72.

A magnetic needle lying parallel to the magnetic requires W units of work to turn it through 60°. Find the value of torque needed to maintain the needle in this position?

a)

W

b)

2W

c)

W √3

d)

(W/2) √3

73.

Which of the following is not a basic property of magnets.

a)

Magnet exists as a monopole

b)

Attractive property

c)

Directive property

d)

Like poles repel and unlike poles attract

74.

When does a magnetic dipole possess maximum potential energy inside a magnetic field?

a)

Magnetic moment and magnetic field are antiparallel

b)

Magnetic moment and magnetic field are parallel

c)

The magnetic moment is zero

d)

The magnetic field is zero

75.

Gyromagnetic Ratio is given by the formula:

a)

Orbital magnetic moment/ angular momentum

b)

Angular momentum/ orbital magnetic moment

c)

(Orbital magnetic moment) × (orbital magnetic moment)

d)

(Orbital magnetic moment)^2/ angular momentum

76.

__________ is defined as the magnetic moment associated with an electron due to its orbital motion in the first orbit of hydrogen atom.

a)

Bohr moment

b)

Bohr magnetism

c)

Bohr magneton

d)

Bohr moment

77.

The correct relation between Bohr magneton and orbital magnetic moment is given by:

a)

Bohr magneton = orbital magnetic moment

b)

Bohr magneton = minimum value of orbital magnetic moment

c)

Bohr magneton = maximum value of orbital magnetic moment

d)

None of the above

78.

The value of Bohr magneton is:

a)

9.27 × 10^-20 Am^2

b)

9.27 × 10^{-24} Am^2

c)

9.27 × 10^24 Am^2

d)

9.27 × 10^20 Am^2

79.

According to the dynamo effect,

a)

Magnetism of the Earth is due to the presence of magnetic material at its centre.

b)

Magnetism of the Earth is due to the ionisation of gases in the Earth’s atmosphere.

c)

Magnetism of the Earth is due to electrical currents produced by convection motion of metallic fluids.

d)

Magnetism of the Earth is due to the rotation of Earth around the Sun.

80.

The Earth’s magnetic field acts in the direction of:

a)

Magnetic meridian

b)

Geographic meridian

c)

Magnetic equator

d)

Geographic equator

81.

A magnet of length 2d and pole strength m is equally divided into two parts perpendicular to its length. What is the magnetic moment of each part?

a)

Half of the total magnetic moment

b)

One-fourth of the total magnetic moment

c)

Equal to the total magnetic moment

d)

Double of the total magnetic moment

82.

The pole strength of a magnet depends on its:

a)

Cross-section

b)

Nature

c)

State of magnetization

d)

All of the above

83.

The great circle on the Earth perpendicular to the magnetic axis is called:

a)

Geographic equator

b)

Magnetic meridian

c)

Magnetic equator

d)

Geographic Meridian

84.

The strength of earth’s magnetic field at its surface is of the order of:

a)

10⁻⁴ T

b)

10⁻⁵ T

c)

10⁻⁸ T

85.

At present, north magnetic pole is located at a place in:

a)

North Canada

b)

Europe

c)

Arctic Circle

d)

South Canada

86.

The dimensional formula of magnetic dipole moment is:

a)

[MLT]

b)

[MLA]

c)

[M⁰LA²]

d)

[MLAT]

87.

For a magnet, the strength of the magnetic field:

a)

Maximum at the poles

b)

Minimum at the poles

c)

Maximum at the centre

d)

Zero at the poles

88.

What is the sure test of magnetism?

a)

Attraction

b)

Repulsion

c)

Both attraction and repulsion

d)

Neither attraction nor repulsion

89.

A stationary magnet does not interact with:

a)

iron rod

b)

moving charge

c)

magnet

d)

stationary charge

90.

A bar magnet AB with magnetic moment M is cut into two equal parts perpendicular to its axis. What will be the magnetic moment of each part?

a)

Zero

b)

M/4

c)

M/2

d)

3M/4

91.

The strength of the earth’s magnetic field is

a)

constant everywhere.

b)

zero everywhere.

c)

having very high value.

d)

vary from place to place on the earth’s surface.

92.

At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 10^–5 T and resultant magnetic field is 4 × 10^–5 T. The angle of dip at this place is

a)

30°

b)

60°

c)

90°

d)

45°

93.

It is considered that the earth consists of a huge bar magnet of magnetic moment 8.0×1022 Am28.0 \times 10^{22} \text{ Am}^2 . What is the magnitude of the earth’s magnetization? (Radius of earth = 6400 km)

a)

100 Am^–1

b)

80.2 Am

c)

72.8 Am^–1

d)

30 Am

94.

An electron moves around the nucleus in an atom of radius 0.53×10^–10 m. If equivalent frequency of the electron is 6.8×10^9 MHz, then the magnetic moment will be:

a)

9.6 × 10^–24 Am^2

b)

9.06 × 10–2410^{–24} Am^2

c)

9.16 × 10^–24 Am^2

d)

0.6 × 10−2410^{-24} Am^2

95.

A magnetic needle is kept in a non-uniform magnetic field. It experiences

a)

a torque but not a force.

b)

Neither a force nor a torque.

c)

A force and a torque.

d)

A force but not a torque.

96.

The magnetic needle is kept in a uniform magnetic field. It experiences

a)

a torque but not a force.

b)

Neither a force nor a torque.

c)

A force and a torque.

d)

A force but not a torque.

97.

The magnetic moment of a current carrying circular loop is M. If current passing through the loop is doubled keeping the radius unchanged, the magnetic moment will become:

a)

M

b)

2M

c)

M/2

d)

M/4

98.

At a given place on earth’s surface the horizontal component of earth’s magnetic field is 4 × 10^5 T and resultant magnetic field is 8 × 10^5 T. The angle of dip at this place is

a)

30°

b)

60°

c)

90°

d)

45°

99.

It is considered that the earth consists of a huge bar magnet of magnetic moment 8.0×1022 Am28.0 \times 10^{22} \text{ Am}^2 . What is the magnitude of the earth’s magnetization? (Radius of earth = 6400 km)

a)

100 Am^−1

b)

80.2 Am

c)

72.8 Am^−1

d)

30 Am

100.

The magnetic lines of force inside a bar magnet:

a)

do not exist

b)

depends on area of cross-section of bar magnet

c)

are from N-pole to S-pole of the magnet

d)

are from S-pole to N-pole of the magnet.

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