CBSE Class 12 Physics Magnetism and Matter MCQs Set 01

Practice MCQs for Class 12 Physics Chapter 05 Magnetism and Matter

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Question: 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

Answer: A

Question: 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

Answer: D

Question: Magnetic lines of force due to a bar magnet do not intersect because
(a) a point always has a single net magnetic field
(b) the lines have similar charges and so repel each other
(c) the lines always diverge from a single force
(d) the lines need magnetic lenses to be made to interest

Answer: A

Question: Choose the correct option

Assertion : The ferromagnetic substance do not obey Curie’s law.
Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Answer: C

Question: The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is

(a) 30 mA
(b) 60 mA
(c) 3 A
(d) 6 A

Answer: C

Question: Choose the correct option

Assertion : A paramagnetic sample display greater magnetisation (for the same magnetic field) when cooled.
Reason : The magnetisation does not depend on temperature
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Answer: D

Question: The magnetic susceptibility is negative for
(a) diamagnetic material only
(b) paramagnetic material only
(c) ferromagnetic material only
(d) paramagnetic and ferromagnetic materials

Answer=A

Question: Two points A and B are situated at a distance x and 2x respectively from the nearer pole of a magnet 2 cm long. The ratio of magnetic field at A and B is
(a) 4 : 1 exactly           
(b) 4 : 1 approximately
(c) 8 : 1 approximately
(d) 1 : 1 approximately

Answer=C

Question: Choose the correct option

Assertion : Electromagnetic are made of soft iron.
Reason : Coercivity of soft iron is small.

(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Answer=B

Question: A magnetic needle of magnetic moment 6.7 × 10–2 Am2 and moment of inertia 7.5 × 10–6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is :

(a) 6.98 s
(b) 8.76 s
(c) 6.65 s
(d) 8. 89 s

Answer=C

Question: The magnetism of magnet is due to
(a) pressure of big magnet inside the earth
(b) earth
(c) cosmic rays
(d) the spin motion of electron
Answer: D

Question: The primary origin (s) of magnetism lies in
(a) atomic currents
(b) polar nature of molecules
(c) extrinsic spin of electron
(d) None of these
Answer: A
 
Question: Identify the mismatched pair
(a) Hard magnet - Alnico
(b) Soft magnet - Soft iron
(c) Bar magnet - Equivalent solenoid
(d) Permanent magnet - Loud speaker
Answer: D
 
Question: Demagnetisation of magnets can be done by
(a) rough handling
(b) heating
(c) magnetising in the opposite direction
(d) All of the above
Answer: D
 
Question: A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one which remains unchanged is
(a) pole strength
(b) magnetic moment
(c) intensity of magnetisation
(d) None of these
Answer: C
 
Question: Current I is flowing in a coil of area A and number of turns is N, then magnetic moment of the coil in M equal to
(a) NIA 
(b) NI/A
(c) NI/ A
(d) N2 AI
Answer: A
 
Question: Magnetic dipole moment is a vector quantity directed from
(a) south pole to north pole
(b) north pole to south pole
(c) east to west
(d) west to east
Answer: A
 
Question: When a current in a circular loop is equivalently replaced by a magnetic dipole
(a) the pole strength m of each pole is fixed
(b) the distance d between the poles is fixed
(c) the product md is fixed
(d) None of these
Answer: C
 
Question: Magnetic lines of force due to a bar magnet do not intersect because
(a) a point always has a single net magnetic field
(b) the lines have similar charges and so repel each other
(c) the lines always diverge from a single force
(d) the lines need magnetic lenses to be made to interest
Answer: A
 
Question: The magnetic lines of force inside a bar magnet
(a) are from N-pole to S-pole of magnet
(b) do not exist
(c) depend upon the area of cross section of bar magnet
(d) are from S-pole of magnet
Answer: D
 
Question: A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is in
(a) end-on position 
(b) broadside-on position
(c) both
(d) None of these 
Answer: A
 
Question: The ratio of magnetic fields due to a smaller bar magnet in the end on position to broad side on position is
(a) 1/4
(b) 1/2
(c) 1 
(d) 2
Answer: D
 
Question: A diamagnetic material in a magnetic field moves
(a) perpendicular to the field
(b) from stronger to the weaker parts of the field
(c) from weaker to the stronger parts of the field
(d) None of these
Answer: B
 
Question: Magnetic field intensity is defined as
(a) Magnetic moment per unit volume
(b) Magnetic induction force acting on a unit magnetic pole
(c) Number of lines of force crossing per unit area
(d) Number of lines of force crossing per unit volume
Answer: B
 
Question: On cutting a solenoid in half, the field lines remain ...A...,emerging from one face of the solenoid and entering into the other face.
Here, A refers to
(a) irregular
(b) discontinuous
(c) continuous 
(d) alternate
Answer: C
 
Question: The magnetic moment of a bar magnet is thus ...A... to the magnetic moment of an equivalent solenoid that produces the same magnetic field.
Here, A refers to
(a) unequal
(b) different
(c) equal 
(d) same
Answer: C
 
Question: The lines of force due to earth’s horizontal magnetic field are
(a) parallel and straight 
(b) concentric circles
(c) elliptical
(d) curved lines
Answer: B
 
Question: The earth’s magnetic field always has a vertical component except at the
(a) magnetic equator 
(b) magnetic poles
(c) geographic north pole
(d) latitude 45º
Answer: A
 
Question: At magnetic poles, the angle of dip is
(a) 45º
(b) 30º
(c) zero
(d) 90º
Answer: D
 
Question: 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 earths surface
Answer: D
 
Question: 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
Answer: A
 
Question: The magnetic compass is not useful for navigation near the magnetic poles, since
(a) R = 0
(b) V = 0
(c) H = 0
(d) θ = 0º
Answer: C
 
Question: A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will
(a) stay in north-south direction only
(b) stay in east-west direction only
(c) become rigid showing no movement
(d) stay in any position
Answer: D
 
Question: A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the mangetic meridian. the needle will stay in
(a) horizontal direction only
(b) vertical direction only
(c) any direction except vertical and horizontal
(d) any direction it is released
Answer: D
 
Question: Which of the following is responsible for the earth’s magnetic field?
(a) Convective currents in earth’s core.
(b) Diversive current in earth’s core.
(c) Rotational motion of earth.
(d) Translational motion of earth.
Answer: A
 
Question: One can define ...A... of a place as the vertical plane which passes through the imaginary line joining the magnetic North and the South–poles.
Here, A refers to
(a) geographic meridian
(b) magnetic meridian
(c) magnetic declination
(d) magnetic inclination
Answer: B
 
Question: The ratio of intensity of magnetisation and magnetising field is called
(a) permeability
(b) magnetic intensity
(c) magnetic intensity
(d) magnetic susceptibility
Answer: D
 
Question: Susceptibility is positive and large for a
(a) paramagnetic substance
(b) ferromagnetic substance
(c) diamagnetic substance
(d) non magnetic substance
Answer: B
 
Question: When the temperature of a magnetic material decreases, the magnetization
(a) decreases in a diamagnetic material
(b) decreases in a paramagnetic material
(c) decreases in a ferromagnetic material
(d) remains the same in a diamagnetic material
Answer: D
 
Question: If μ0 is absolute permeability of vacuum and μr is relative magnetic permeability of another medium, then permeability μ of the medium is
(a) μ0 μr
(b) μ0/μr
(c) μr/μ0
(d) 1/μ0 μR
Answer: D
 
Question: Which of the following is not correct about relative magnetic permeability (μ,)? 
(a) It is a dimensionsless pure ratio.
(b) For vacuum medium its value is one.
(c) For ferromagnetic materials μ, > > 1
(d) For paramagnetic materials μ, > 1.
Answer: D
 
Question: Hysterisis is the phenomenon of lagging of
(a) I behind B
(b) B behind I
(c) I and B behind H
(d) H behind I
Answer: C
 
Question: Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called
(a) diamagnetic
(b) paramagnetic
(c) ferromagnetic
(d) antimagnetic
Answer: B
 
Question: The magnetic susceptibility for diamagnetic materials is
(a) small and negative
(b) small and positive
(c) large and positive
(d) large and negative
Answer: A
 
Question: Which magnetic materials have negative susceptibility?
(a) diamagnetic materials
(b) paramagnetic materials
(c) ferromagnetic materials
(d) All the above
Answer: A
 
Question: If a diamagnetic substance is brought near north or south pole of a bar magnet, it is
(a) attracted by poles
(b) repelled by poles
(c) replaced by north pole and attracted by south pole
(d) attracted by north pole and repelled by south pole
Answer: B
 
Question: Among which of the following the magnetic susceptibility does not depend on the temperature?
(a) Dia-magnetism
(b) Para-magnetism
(c) Ferro-magnetism
(d) Ferrite
Answer: A
 
Question: The narrowest hysterisis loop is for
(a) cobalt steel
(b) alnico
(c) perm alloy
(d) stainless steel
Answer: C
 
Question: The hysterisis curve is studied generally for
(a) ferromagnetic materials
(b) paramagnetic materials
(c) diamagnetic materials
(d) all of the above 
Answer: A
 
Question: Curie temperature is the temperature above which
(a) a ferromagnetic material becomes paramagenetic
(b) a paramagnetic material becomes diamagnetic
(c) a ferromagnetic material becomes diamagnetic
(d) a paramagnetic meterial becomes ferromagnetic
Answer: A
 
Question: A material is placed in a magnetic field and it is thrown out of it. Then the material is
(a) paramagnetic
(b) diamagnetic
(c) ferromagnetic
(d) non-magnetic
Answer: B
 
Question: A diamagnetic material in a magnetic field moves
(a) perpendicular to field
(b) from stronger to weaker parts of field
(c) from weaker to stronger parts of the field
(d) None of these
Answer: B
 
Question: A temporary magnet is made of
(a) cast iron
(b) steel
(c) soft iron
(d) stainless steel
Answer: A
 
Question: The hysteresis cycle for the material of permanent magnet is
(a) short and wide
(b) tall and narrow
(c) tall and wide 
(d) short and narrow
Answer: C
 
Question: Materials suitable for permanent magnet, must have which of the following properties?
(a) High retentivity, low coercivity and high permeability.
(b) Low retentivity, low coercivity and low permeability.
(c) Low retentivity, high coercivity and low permeability.
(d) High retentivity, high coercivity and high permeability.
Answer: D
 
Question: Which of the following is the most suitable material for making permanent magnet ?
(a) Steel
(b) Soft iron
(c) Copper
(d) Nickel
Answer: A
 
Question: The materials suitable for making electromagnets should have
(a) high retentivity and low coercivity
(b) low retentivity and low coercivity
(c) high retentivity and high coercivity
(d) low retentivity and high coercivity
Answer: B
 
Question: Core of elctromagnets are made of ferromagnetic materials which have
(a) low permeability and low retentivity
(b) high permeability and high retentivity
(c) high permeability and high retentivity.
(d) low permeability and high retentivity.
Answer: C
 
Question: Permanent magnets are the substances having the property of
(a) ferromagnetism at room temperature for a long period of time.
(b) paramagnetism at room temperature for a long period of time.
(c) anti ferromagnetism at room temperature for a long period of time.
(d) diamagnetism at room temperature for a long period of time. 
Answer: A

Question: Choose the correct option

Assertion : The poles of magnet can not be separated by breaking into two pieces.
Reason : The magnetic moment will be reduced to half when a magnet is broken into two equal pieces

(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Answer: B

Question: A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

(a) the current source
(b) the magnetic field
(c) the induced electric field due to the changing magnetic field
(d) the lattice structure of the material of the rod

Answer: A

Question: Choose the correct option

Assertion : The earth¢s magnetic field is due to iron present in its core.
Reason : At a high temperature magnet losses its magnetism

(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: D

Question: A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of 75°. One of the fields has a magnitude of 15 mT. The dipole attains stable equilibrium at an angle of 30° with this field. The magntidue of the other field (in mT) is close to

(a) 1
(b) 11
(c) 36
(d) 1060

Answer: B

Question: A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40º. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30º with the magnetic
meridian. In this position, the needle will dip by an angle
(a) 40º         
(b) 30º
(c) more than 40º
(d) less than 40º

Answer: B

Question: A magnetic dipole is under the influence of two magnetic fields The angle between the field directions is 60° and one of the fields has a magnitude of 1.2 × 10–2 T. If the dipole comes to stable equilibrium at an angle of 15° with this field, what is the magnitude of other field ?
(a) 4.4 × 10–3 tesla
(b) 5.2 × 10–3 tesla
(c) 3.4 × 10–3 tesla
(d) 7.8 × 10–3 tesla

Answer: A

Question: A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north of east. The magnetic meridian of the place happens to be 10° west of the geographic meridian. The earth’s magnetic field at the location is 0.33 Gauss, and the angle of dip is zero. Locate the line of neutral points. (Ignore the thickness of the cable).
(a) 1.5 cm
(b) 2.5 cm
(c) 3.5 cm
(d) 2.0 cm

Answer: A

Question: A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained 20 cm away from the centre of the magnet. If the earth¢s magnetic field (horizontal component) at this point be 0.3 gauss, the magnetic moment of the magnet is
(a) 8.0 × 102 e.m.u.
(b) 1.2 × 103 e.m.u.
(c) 2.4 × 103 e.m.u.
(d) 3.6 × 103 e.m.u.

Answer: B

Question: The time period of oscillation of a magnet in a vibration magnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1st magnet oscillating at the same place will be
(a) 0.75 sec
(b) 1.5 sec
(c) 3.0 sec
(d) 6.0 sec

Answer: C

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