Magnetism and Matter- 2 Practice Questions - DPP for NEET

 Page 1


DIRECTIONS (Q.1-Q.24) : There are 24 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 Susceptibility of ferromagnetic substance is
(a) > 1 (b) < 1 (c)0 (d)1
Q.2 Among the following properties describing diamagnetism
identify the property that is wrongly stated.
(a) Diamagnetic material do not have permanent
magnetic moment
(b) Diamagnetism is explained in terms of
electromagnetic induction.
(c) Diamagnetic materials have a small positive
susceptibility
(d) The magnetic moment of individual electrons
neutralize each other
Q.3 If the magnetic dipole moment of an atom of diamagnetic
material, paramagnetic material and ferromagnetic material
denoted by 
,, m mm
dpf
respectively then
(a) ,0 m¹
d
and 0
f
m¹ (b) 0
p
m= and 0
f
m¹
(c) 0
d
m= and 
0
p
m¹
(d) 0
d
m¹ and 
0
p
m=
Q.4 When a piece of a ferromagnetic substance is put in a
uniform magnetic field, the flux density inside it is four
times the flux density away from the piece. The magnetic
permeability of the material is
(a)1 (b)2
(c)3 (d)4
Page 2


DIRECTIONS (Q.1-Q.24) : There are 24 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 Susceptibility of ferromagnetic substance is
(a) > 1 (b) < 1 (c)0 (d)1
Q.2 Among the following properties describing diamagnetism
identify the property that is wrongly stated.
(a) Diamagnetic material do not have permanent
magnetic moment
(b) Diamagnetism is explained in terms of
electromagnetic induction.
(c) Diamagnetic materials have a small positive
susceptibility
(d) The magnetic moment of individual electrons
neutralize each other
Q.3 If the magnetic dipole moment of an atom of diamagnetic
material, paramagnetic material and ferromagnetic material
denoted by 
,, m mm
dpf
respectively then
(a) ,0 m¹
d
and 0
f
m¹ (b) 0
p
m= and 0
f
m¹
(c) 0
d
m= and 
0
p
m¹
(d) 0
d
m¹ and 
0
p
m=
Q.4 When a piece of a ferromagnetic substance is put in a
uniform magnetic field, the flux density inside it is four
times the flux density away from the piece. The magnetic
permeability of the material is
(a)1 (b)2
(c)3 (d)4
2
DPP/ P 43
Q.5 The given figure represents a material which is
(a) Paramagnetic
(b) Diamagnetic
(c) Ferromagnetic
(d) None of these
Q.6 Liquid oxygen remains suspended between two pole faces
of a magnet because it is
(a) diamagnetic (b) paramagnetic
(c) ferromagnetic (d) antiferromagnetic
Q.7 A superconductor exhibits perfect
(a) ferrimagnetism (b) ferromagnetism
(c) paramagnetism (d) diamagnetism
Q.8 Which of the following is the most suitable for the core
of electromagnets?
(a) Soft iron (b) Steel
(c) Copper-nickel alloy (d) Air
Q.9 The universal property of all substances is
(a) diamagnetism (b) ferromagnetism
(c) paramagnetism (d) all of these
Q.10 If a magnetic substance is kept in a magnetic field, then
which of the following substance is thrown out ?
(a) Paramagnetic (b) Ferromagnetic
(c) Diamagnetic (d) Antiferromagnetic
Q.11 In the hysteresis cycle, the value of H needed to make the
intensity of magnetisation zero is called
(a) Retentivity (b) Coercive force
(c) Lorentz force (d) None of these
Q.12 If a diamagnetic solution is poured into a U-tube and one
arm of this U-tube placed between the poles of a strong
magnet with the meniscus in a line with field, then the level
of the solution will
(a) rise (b) fall
(c) oscillate slowly (d) remain as such
Q.13The relative permeability is represented by µ
r
 and the
susceptibility is denoted by c for a magnetic substance.
Then for a paramagnetic substance
(a) 1,0 m < c<
r
(b) 1,0 m < c>
r
(c) 1,0 m > c<
r
(d) 1,0 m > c>
r
Q.14 The use of study of hysteresis curve for a given material is
to estimate the
(a) voltage loss (b) hysteresis loss
(c) current loss (d) all of these
Q.15 The magnetic moment of atomic neon is
(a) zero (b) mB/2
(c) mB (d)3mB/2
Q.16A ferromagnetic material is heated above its Curie
temperature, then which one is a correct statement ?
(a) Ferromagnetic domains are perfectly arranged
(b) Ferromagnetic domains becomes random
(c) Ferromagnetic domains are not influenced
(d) Ferromagnetic material changes itself into
diamagnetic material
Q.17 If a diamagnetic substance is brought near north or south
pole of a bar magnet, it is
(a) attracted by the poles
(b) repelled by the poles
(c) repelled by the north pole and attracted by the south pole
(d) attracted by the north pole and repelled by the south pole
Q.18 The material of permanent magnet has
(a) high retentivity, low coercivity
(b) low retentivity, high coercivity
(c) low retentivity, low coercivity
(d) high retentivity, high coercivity
Q.19 Diamagnetic substances are
(a) feebly attracted by magnets
(b) strongly attracted by magnets
(c) feebly repelled by magnets
(d) strongly repelled by magnets
Page 3


DIRECTIONS (Q.1-Q.24) : There are 24 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 Susceptibility of ferromagnetic substance is
(a) > 1 (b) < 1 (c)0 (d)1
Q.2 Among the following properties describing diamagnetism
identify the property that is wrongly stated.
(a) Diamagnetic material do not have permanent
magnetic moment
(b) Diamagnetism is explained in terms of
electromagnetic induction.
(c) Diamagnetic materials have a small positive
susceptibility
(d) The magnetic moment of individual electrons
neutralize each other
Q.3 If the magnetic dipole moment of an atom of diamagnetic
material, paramagnetic material and ferromagnetic material
denoted by 
,, m mm
dpf
respectively then
(a) ,0 m¹
d
and 0
f
m¹ (b) 0
p
m= and 0
f
m¹
(c) 0
d
m= and 
0
p
m¹
(d) 0
d
m¹ and 
0
p
m=
Q.4 When a piece of a ferromagnetic substance is put in a
uniform magnetic field, the flux density inside it is four
times the flux density away from the piece. The magnetic
permeability of the material is
(a)1 (b)2
(c)3 (d)4
2
DPP/ P 43
Q.5 The given figure represents a material which is
(a) Paramagnetic
(b) Diamagnetic
(c) Ferromagnetic
(d) None of these
Q.6 Liquid oxygen remains suspended between two pole faces
of a magnet because it is
(a) diamagnetic (b) paramagnetic
(c) ferromagnetic (d) antiferromagnetic
Q.7 A superconductor exhibits perfect
(a) ferrimagnetism (b) ferromagnetism
(c) paramagnetism (d) diamagnetism
Q.8 Which of the following is the most suitable for the core
of electromagnets?
(a) Soft iron (b) Steel
(c) Copper-nickel alloy (d) Air
Q.9 The universal property of all substances is
(a) diamagnetism (b) ferromagnetism
(c) paramagnetism (d) all of these
Q.10 If a magnetic substance is kept in a magnetic field, then
which of the following substance is thrown out ?
(a) Paramagnetic (b) Ferromagnetic
(c) Diamagnetic (d) Antiferromagnetic
Q.11 In the hysteresis cycle, the value of H needed to make the
intensity of magnetisation zero is called
(a) Retentivity (b) Coercive force
(c) Lorentz force (d) None of these
Q.12 If a diamagnetic solution is poured into a U-tube and one
arm of this U-tube placed between the poles of a strong
magnet with the meniscus in a line with field, then the level
of the solution will
(a) rise (b) fall
(c) oscillate slowly (d) remain as such
Q.13The relative permeability is represented by µ
r
 and the
susceptibility is denoted by c for a magnetic substance.
Then for a paramagnetic substance
(a) 1,0 m < c<
r
(b) 1,0 m < c>
r
(c) 1,0 m > c<
r
(d) 1,0 m > c>
r
Q.14 The use of study of hysteresis curve for a given material is
to estimate the
(a) voltage loss (b) hysteresis loss
(c) current loss (d) all of these
Q.15 The magnetic moment of atomic neon is
(a) zero (b) mB/2
(c) mB (d)3mB/2
Q.16A ferromagnetic material is heated above its Curie
temperature, then which one is a correct statement ?
(a) Ferromagnetic domains are perfectly arranged
(b) Ferromagnetic domains becomes random
(c) Ferromagnetic domains are not influenced
(d) Ferromagnetic material changes itself into
diamagnetic material
Q.17 If a diamagnetic substance is brought near north or south
pole of a bar magnet, it is
(a) attracted by the poles
(b) repelled by the poles
(c) repelled by the north pole and attracted by the south pole
(d) attracted by the north pole and repelled by the south pole
Q.18 The material of permanent magnet has
(a) high retentivity, low coercivity
(b) low retentivity, high coercivity
(c) low retentivity, low coercivity
(d) high retentivity, high coercivity
Q.19 Diamagnetic substances are
(a) feebly attracted by magnets
(b) strongly attracted by magnets
(c) feebly repelled by magnets
(d) strongly repelled by magnets
DPP/ P 43
3
Q.20 For an isotropic medium B, µ, H and M are related as (where
B, µ
0
, H and M have their usual meaning in the context of
magnetic material)
(a) (B – M) = µ
0
H (b) M = µ
0
(H + M)
(c) H = µ
0
(H + M) (d) B = µ
0
(H + M)
Q.21Relative permeability of iron is 5500, then its magnetic
susceptibility will be
(a) 5500 × 10
7
(b) 5500 × 10
–7
(c) 5501 (d) 5499
Q.22 A magnetising field of 2 × 10
3
 amp/m produces a magnetic
flux density of 8 p Tesla in an iron rod. The relative
permeability of the rod will be
(a) 10
2
(b) 10
0
(c) 10
4
(d) 10
1
Q.23 The mass of a specimen of a ferromagnetic material is 0.6
kg. and its density is 7.8 × 10
3
 kg/m
3
. If the area of
hysteresis loop of alternating magnetising field of
frequency 50Hz is 0.722 MKS units then the hysteresis
loss per second will be
(a) 277.7 × 10
-5
 Joule
(b) 277.7 × 10
-6
 Joule
(c) 277.7 × 10
-4
 Joule
Soft iron
Steel
H
X'
Y
Y'
X
I
(d) 27.77 × 10
-4
 Joule
Q.24 A diamagnetic material in a magnetic field moves
(a) from weaker to the stronger parts of the field
(b) perpendicular to the field
(c) from stronger to the weaker parts of the field
(d) None of these
DIRECTIONS (Q.25-Q.27) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.25A magnetising field of 1600 Am
–1
 produces a magnetic
flux of 2.4 × 10
–5
 weber in a bar of iron of area of cross-
section 0.2 cm
2
. Then,
(1) the magnetic permeability of the bar is
7.5 × 10
–4
 TA
–1
m
(2) the susceptibility of the bar is 596.1
(3) the magnetic permeability of the bar is  4.1 Wbm
–2
(4) the susceptibility of the bar is 496.1
Q.26Which of the following statements are correct about
hysteresis?
(1) This effect is common to all ferromagnetic substances
(2) The hysteresis loop area is proportional to the thermal
energy developed per unit volume of the material
(3) The shape of the hysteresis loop is characteristic of
the material
(4) The hysteresis loop area is independent of the thermal
energy developed per unit volume of the material
Q.27Which of the following statments are false about the
magnetic susceptibility 
m
c of paramagnetic substance?
(1) Value of 
m
c
 is directly proportional to the absolute
temperature of the sample
(2)
m
c
 is negative at all temperature
(3)
m
c
 does not depend on the temperature of the sample
(4)
m
c
 is positive at all temperature
DIRECTIONS (Q. 28-Q.30) : Each of these questions contains
two statements: Statement-1 (Assertion) and Statement-2
(Reason). Each of these questions has four alternative choices,
only one of which is the correct answer. You have to select the
correct choice.
(a) Statement-1 is True, Statement-2 is True; Statement-2 is a
correct explanation for  Statement-1.
(b) Statement-1 is True, Statement-2 is True; Statement-2 is
NOT a correct explanation for Statement-1.
(c) Statement -1 is False, Statement-2 is True.
(d) Statement -1 is True, Statement-2 is False.
Page 4


DIRECTIONS (Q.1-Q.24) : There are 24 multiple choice
questions. Each question has 4 choices (a), (b), (c) and (d), out
of which ONLY ONE choice is correct.
Q.1 Susceptibility of ferromagnetic substance is
(a) > 1 (b) < 1 (c)0 (d)1
Q.2 Among the following properties describing diamagnetism
identify the property that is wrongly stated.
(a) Diamagnetic material do not have permanent
magnetic moment
(b) Diamagnetism is explained in terms of
electromagnetic induction.
(c) Diamagnetic materials have a small positive
susceptibility
(d) The magnetic moment of individual electrons
neutralize each other
Q.3 If the magnetic dipole moment of an atom of diamagnetic
material, paramagnetic material and ferromagnetic material
denoted by 
,, m mm
dpf
respectively then
(a) ,0 m¹
d
and 0
f
m¹ (b) 0
p
m= and 0
f
m¹
(c) 0
d
m= and 
0
p
m¹
(d) 0
d
m¹ and 
0
p
m=
Q.4 When a piece of a ferromagnetic substance is put in a
uniform magnetic field, the flux density inside it is four
times the flux density away from the piece. The magnetic
permeability of the material is
(a)1 (b)2
(c)3 (d)4
2
DPP/ P 43
Q.5 The given figure represents a material which is
(a) Paramagnetic
(b) Diamagnetic
(c) Ferromagnetic
(d) None of these
Q.6 Liquid oxygen remains suspended between two pole faces
of a magnet because it is
(a) diamagnetic (b) paramagnetic
(c) ferromagnetic (d) antiferromagnetic
Q.7 A superconductor exhibits perfect
(a) ferrimagnetism (b) ferromagnetism
(c) paramagnetism (d) diamagnetism
Q.8 Which of the following is the most suitable for the core
of electromagnets?
(a) Soft iron (b) Steel
(c) Copper-nickel alloy (d) Air
Q.9 The universal property of all substances is
(a) diamagnetism (b) ferromagnetism
(c) paramagnetism (d) all of these
Q.10 If a magnetic substance is kept in a magnetic field, then
which of the following substance is thrown out ?
(a) Paramagnetic (b) Ferromagnetic
(c) Diamagnetic (d) Antiferromagnetic
Q.11 In the hysteresis cycle, the value of H needed to make the
intensity of magnetisation zero is called
(a) Retentivity (b) Coercive force
(c) Lorentz force (d) None of these
Q.12 If a diamagnetic solution is poured into a U-tube and one
arm of this U-tube placed between the poles of a strong
magnet with the meniscus in a line with field, then the level
of the solution will
(a) rise (b) fall
(c) oscillate slowly (d) remain as such
Q.13The relative permeability is represented by µ
r
 and the
susceptibility is denoted by c for a magnetic substance.
Then for a paramagnetic substance
(a) 1,0 m < c<
r
(b) 1,0 m < c>
r
(c) 1,0 m > c<
r
(d) 1,0 m > c>
r
Q.14 The use of study of hysteresis curve for a given material is
to estimate the
(a) voltage loss (b) hysteresis loss
(c) current loss (d) all of these
Q.15 The magnetic moment of atomic neon is
(a) zero (b) mB/2
(c) mB (d)3mB/2
Q.16A ferromagnetic material is heated above its Curie
temperature, then which one is a correct statement ?
(a) Ferromagnetic domains are perfectly arranged
(b) Ferromagnetic domains becomes random
(c) Ferromagnetic domains are not influenced
(d) Ferromagnetic material changes itself into
diamagnetic material
Q.17 If a diamagnetic substance is brought near north or south
pole of a bar magnet, it is
(a) attracted by the poles
(b) repelled by the poles
(c) repelled by the north pole and attracted by the south pole
(d) attracted by the north pole and repelled by the south pole
Q.18 The material of permanent magnet has
(a) high retentivity, low coercivity
(b) low retentivity, high coercivity
(c) low retentivity, low coercivity
(d) high retentivity, high coercivity
Q.19 Diamagnetic substances are
(a) feebly attracted by magnets
(b) strongly attracted by magnets
(c) feebly repelled by magnets
(d) strongly repelled by magnets
DPP/ P 43
3
Q.20 For an isotropic medium B, µ, H and M are related as (where
B, µ
0
, H and M have their usual meaning in the context of
magnetic material)
(a) (B – M) = µ
0
H (b) M = µ
0
(H + M)
(c) H = µ
0
(H + M) (d) B = µ
0
(H + M)
Q.21Relative permeability of iron is 5500, then its magnetic
susceptibility will be
(a) 5500 × 10
7
(b) 5500 × 10
–7
(c) 5501 (d) 5499
Q.22 A magnetising field of 2 × 10
3
 amp/m produces a magnetic
flux density of 8 p Tesla in an iron rod. The relative
permeability of the rod will be
(a) 10
2
(b) 10
0
(c) 10
4
(d) 10
1
Q.23 The mass of a specimen of a ferromagnetic material is 0.6
kg. and its density is 7.8 × 10
3
 kg/m
3
. If the area of
hysteresis loop of alternating magnetising field of
frequency 50Hz is 0.722 MKS units then the hysteresis
loss per second will be
(a) 277.7 × 10
-5
 Joule
(b) 277.7 × 10
-6
 Joule
(c) 277.7 × 10
-4
 Joule
Soft iron
Steel
H
X'
Y
Y'
X
I
(d) 27.77 × 10
-4
 Joule
Q.24 A diamagnetic material in a magnetic field moves
(a) from weaker to the stronger parts of the field
(b) perpendicular to the field
(c) from stronger to the weaker parts of the field
(d) None of these
DIRECTIONS (Q.25-Q.27) : In the following questions,
more than one of the answers  given are correct. Select the
correct answers and mark it according to the following
codes:
Codes :
(a) 1, 2 and 3 are correct (b) 1 and 2 are correct
(c) 2 and 4 are correct (d) 1 and 3 are correct
Q.25A magnetising field of 1600 Am
–1
 produces a magnetic
flux of 2.4 × 10
–5
 weber in a bar of iron of area of cross-
section 0.2 cm
2
. Then,
(1) the magnetic permeability of the bar is
7.5 × 10
–4
 TA
–1
m
(2) the susceptibility of the bar is 596.1
(3) the magnetic permeability of the bar is  4.1 Wbm
–2
(4) the susceptibility of the bar is 496.1
Q.26Which of the following statements are correct about
hysteresis?
(1) This effect is common to all ferromagnetic substances
(2) The hysteresis loop area is proportional to the thermal
energy developed per unit volume of the material
(3) The shape of the hysteresis loop is characteristic of
the material
(4) The hysteresis loop area is independent of the thermal
energy developed per unit volume of the material
Q.27Which of the following statments are false about the
magnetic susceptibility 
m
c of paramagnetic substance?
(1) Value of 
m
c
 is directly proportional to the absolute
temperature of the sample
(2)
m
c
 is negative at all temperature
(3)
m
c
 does not depend on the temperature of the sample
(4)
m
c
 is positive at all temperature
DIRECTIONS (Q. 28-Q.30) : Each of these questions contains
two statements: Statement-1 (Assertion) and Statement-2
(Reason). Each of these questions has four alternative choices,
only one of which is the correct answer. You have to select the
correct choice.
(a) Statement-1 is True, Statement-2 is True; Statement-2 is a
correct explanation for  Statement-1.
(b) Statement-1 is True, Statement-2 is True; Statement-2 is
NOT a correct explanation for Statement-1.
(c) Statement -1 is False, Statement-2 is True.
(d) Statement -1 is True, Statement-2 is False.
4
DPP/ P 43
Q.28Statement-1 : The ferromagnetic substance do not obey
Curie’s law .
Statement-2  :  At Curie point a ferromagnetic substance
start behaving as a paramagnetic substance.
Q.29Statement-1 : A paramagnetic sample displays greater
magnetisation (for the same magnetising field) when
cooled.
Statement-2 : The magnetisation does not depend on
temperature.
Q.30Statement-1 : The permeability of a ferromagnetic
material dependent on the magnetic field.
Statement-2 : Permeability of a material is a constant
quantity.