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Basic Science Magnetic Field
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Basic Science Magnetic Field
1
The permeability of free space is
A
1 H/m
B
0
C
4? ? 10-7 H/m
D
4? ? 107 H/m
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✅ Correct Answer: 3
2
The unit of pole strength is
A
Am
B
A/m
C
Wbm
D
Wb/m
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✅ Correct Answer: 1
3
The intensity of magnetic field is the force acting on
A
a short bar magnet
B
a long bar magnet
C
a unit north pole
D
a unit south pole
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✅ Correct Answer: 3
4
The ratio of the flux density to the magnetic field strength in a medium is its
A
intensity of magnetization
B
susceptibility
C
relative permeability
D
permeability
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✅ Correct Answer: 4
5
A freely suspended magnet will always come to rest in the direction
A
East-North
B
North-West
C
North-South
D
South-West
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✅ Correct Answer: 3
6
ttractive force exists between
A
two south poles
B
two north poles
C
poles of the same magnet
D
one north pole and one south pole
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✅ Correct Answer: 4
7
The unit of magnetic flux is
A
weber
B
tesla
C
weber-metre
D
ampere-metre
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✅ Correct Answer: 2
8
The flux density is
A
a scalar quantity
B
is a vector quantity
C
the magnetic moment per unit volume
D
the dipoles per unit volume
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✅ Correct Answer: 3
9
A uniform magnetic field
A
is produced by a bar magnet
B
is produced by an isolated north pole
C
has parallel flux lines
D
produces no force on a north pole
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✅ Correct Answer: 3
10
The magnetic flux
A
is a scalar quantity
B
is a vector quantity
C
denotes the amount of the force on a north pole
D
is the magnetic moment of a bar magnet
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✅ Correct Answer: 1
11
Force of the attraction between two poles placed in vacuum
A
decreases as the pole strength increases
B
increases with decrease in distance
C
decreases with decrease in distance
D
increases with decrease in pole strength
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✅ Correct Answer: 2
12
When a magnet is dipped in iron filings the fillings
A
cling throughout the magnet
B
cling to the magnet at the ends only
C
cling to the magnet at its center only
D
do not cling to the magnet
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✅ Correct Answer: 2
13
Ampere-meter is the unit of
A
magnetic moment
B
pole strength
C
electric potential
D
magnetic potential
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✅ Correct Answer: 2
14
The relationship between the magnetic induction B and the intensity of magnetic field H is
A
�0 = H/B
B
B = �0 H
C
H = �0 B
D
�0 = HB
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✅ Correct Answer: 2
15
The distance between the poles of a magnet is called
A
magnetic axis
B
magnetic moments
C
length of the magnet
D
magnetic length
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✅ Correct Answer: 4
16
The unit of permeability is
A
H
B
Hm
C
H/m
D
Wb
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✅ Correct Answer: 3
17
� indicates the property of
A
a dielectric
B
a conductor
C
a magnetic material
D
an insulator
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✅ Correct Answer: 3
18
The force experienced by a magnet of pole strength m in a uniform magnetic field of strength H is
A
mH
B
m/H
C
H/m
D
mWb
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✅ Correct Answer: 1
19
A line of force in a magnetic field
A
is a line joining the poles
B
is a path along which an isolated charge moves
C
is a path along which a short bar magnet moves
D
is a path along which an isolated north pole moves
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✅ Correct Answer: 4
20
The unit of intensity of magnetic field is
A
weber/metre2
B
weber/metre
C
ampere-metre2
D
ampere /metre
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✅ Correct Answer: 4
21
Force between two identical magnets is proportional to
A
m/d
B
m2/d
C
m/d2
D
m2/d2
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✅ Correct Answer: 4
22
22.The direction of magnetic field is the direction along which
A
a tiny bar magnet moves
B
an isolated south pole moves
C
an isolated north pole moves
D
a unit positive charge moves
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✅ Correct Answer: 3
23
� is the symbol for
A
permittivity
B
permeability
C
conductivity
D
resistivity
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✅ Correct Answer: 2
24
The relationship between relative permeability of a medium and permeability of free space is
A
�r = �r ? �0
B
� = �0 �r
C
�r = �0 / �
D
� = �0 / �r
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✅ Correct Answer: 2
25
The south pole of the earths magnetic field
A
is at the centre of the earth
B
lies along the equatorial line
C
lies in the northern hemisphere
D
lies in the southern hemisphere
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✅ Correct Answer: 3
26
The value of the relative permeability of air is
A
4? ? 10-7
B
0
C
-1
D
1
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✅ Correct Answer: 4
27
The north pole of the earths magnetic field
A
is at the centre of the earth
B
lies along the equatorial line
C
lies in the northern hemisphere
D
lies in the southern hemisphere
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✅ Correct Answer: 4
28
The dimension of �r is
A
ML0 T -1
B
LT -1
C
HM -1
D
nil
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✅ Correct Answer: 4
29
The magnetic axis of a magnet is
A
perpendicular to the length of the magnet
B
along the line joining the poles
C
the direction of zero magnetic flux
D
a line of zero moment
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✅ Correct Answer: 2
30
One tesla is equivalent to
A
weber
B
weber/metre2
C
amp-metre
D
amp/metre
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✅ Correct Answer: 2
31
The relationship between magnetic flux and magnetic induction B is
A
? = B/A
B
B = A/?
C
B = ? A
D
B = ?/A
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✅ Correct Answer: 4
32
The total number of lines of induction crossing any area is known as
A
magnetic induction
B
magnetic flux
C
magnetic field
D
mutual induction
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✅ Correct Answer: 2
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