NCERT Solutions for class 12 Physics | Chapter 5 - Magnetism and Matter

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Questions
1 Which of the following is correct about magnetic monopole?
A Magnetic monopole exist.
B Magnetic monopole does not exist.
C Magnetic monopole have constant value of monopole momentum.
D The monopole momentum increase due to increase at its distance from the field.

Answer:Magnetic monopole does not exist.
2 The primary origin of magnetism lies in
A atomic current and intrinsic spin of electrons.
B polar and non polar nature of molecules.
C pauli exclusion principle.
D electronegative nature of materials.

Answer:atomic current and intrinsic spin of electrons.
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3 A current carrying loop is placed in a uniform magnetic field in four different orientations as shown in figure. Arrange them in the decreasing order of potential energy.

Class 12 Physics Chapter 5 Magnetism and Matter

A 4, 2, 3,1
B 1, 4, 2, 3
C 4, 3, 2,1
D 1, 2, 3, 4

Answer:1, 4, 2, 3
4 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°

Answer:60°
5 At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 103-5 T and resultant magnetic field is 4 × 103-5 T. The angle of dip at this place is
A 30°
B 60°
C 90°
D 45°

Answer:60°
6 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).

Answer:Vertical component of earth’s field (BV).
7 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

Answer:equal for both
8 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°

Answer:45°
9 The net magnetic flux through any closed surface, kept in a magnetic field is
A zero
B μ0/4π
C 4πμ0
D 4μ0/π

Answer:zero
10 Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure. The force on the charge Q is

Class 12 Physics Chapter 5 Magnetism and Matter

A zero
B directed along OP
C directed along PO
D directed perpendicular to the plane of paper

Answer:zero
11 The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the
A charge on fie particle
B Momentum of particle
C energy of particle
D Strength of field

Answer:Momentum of particle
12 The Mariner’s compass is provided with Gimbals arrangement so as to :
A keep the needle always horizontal
B give a direct reading of declination
C give the direct value of dip
D all of the above

Answer:give the direct value of dip
13 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 an outside the earth

Answer:motion and distribution of some material in an outside the earth
14 Which of the following has higher magnetic susceptibility?
A diamagnetic
B paramagnetic
C ferromagnetic
D None of these

Answer:ferromagnetic
15 The force between two parallel wire 2 × 10-7 Nm-1, placed 1 m apart to each other in vacuum. The electric current flowing through the wires is:
A 1 A
B zero
C 5 × 106 A
D 2 × 10-7 A

Answer:1 A
16 On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become:
A half
B double
C four times
D one-fourth

Answer:half
17 A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?
A N to S
B S to N
C E to W
D W to E

Answer:N to S
18 A magnetic dipole moment is a vector quantity directed from:
A S to N
B N to S
C E to W
D W to E

Answer:S to N
19 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

Answer:two uniform and mutually perpendicular magnetic fields exist
20 Which of the following has a low value in ferrites?
A Conductivity
B Permeability
C Magnetic susceptibility
D All the above

Answer:Conductivity

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