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

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Free download in PDF Class 12 Physics Chapter 5 Magnetism and Matter Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(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.

[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

[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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