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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) 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°
(2) 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°

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(3) A magnet of dipole moment M is aligned in equilibrium position in a magnetic field of intensity B. The work done to rotate it through an angle 0 with the magnetic field is
[A] MB sin θ
[B] MB cos θ
[C] MB (1 – cos θ)
[D] MB(l – sin θ)
Answer: MB (1 – cos θ)
(4) At a point on the right bisector of a magnetic dipole, the magnetic
[A] potential varies as 1/r²
[B] potential is zero at all points on the right bisector.
[C] field varies as r3.
[D] field is perpendicular to the axis of dipole.
Answer: potential is zero at all points on the right bisector.
(5) At a certain place on earth, BH= angle of dip at this place is
[A] 60°
[B] 30°
[C] 45°
[D] 90°
Answer: 60°
(6) A diamagnetic material in a magnetic field moves
[A] perpendicular to the field.
[B] from weaker to stronger parts.
[C] from stronger to weaker parts.
[D] in random direction.
Answer: from stronger to weaker parts.
(7) In which type of material the magnetic susceptibility does not depend on temperature?
[A] Diamagnetic
[B] Paramagnetic
[C] Ferromagnetic
[D] Ferrite
Answer: Diamagnetic
(8) Domain formation is the necessary feature of
[A] diamagnetism
[B] Paramagnetis.
[C] ferromagnetism.
[D] all of these.
Answer: ferromagnetism.
(9) The best material for the ore of a transformer is
[A] stainless steel
[B] mild steel
[C] hard steel
[D] soft iron
Answer: soft iron
(10) The magnetic susceptibility of an ideal diamagnetic substance is
[A] +1
[B] 0
[C] -1
[D] ∞
Answer: -1
(11) A magnetic needle suspended parallel to a magnetic field requires /3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be
[A] 2√3 J
[B] 3 J
[C] √ J
[D]
Answer: 3 J
(12) If the magnetising field on a ferromagnetic material is increased, its permeability.
[A] is decreased
[B] is increased
[C] is unaffected
[D] may be increased or decreased.
Answer: is decreased
(13) Lines of force, due to earth’s horizontal magnetic field, are
[A] elliptical
[B] curved lines
[C] concentric circles
[D] parallel and straight
Answer: parallel and straight
(14) Angle of dip is 90° at
[A] poles.
[B] equator.
[C] both at equator and poles.
[D] tropic of cancer.
Answer: poles.
(15) Curie law xT = constant, relating magnetic susceptibility (x) and absolute temperature (T) of magnetic substance is obeyed by
[A] all magnetic substances.
[B] paramagnetic substances.
[C] diamagnetic substances.
[D] ferromagnetic substances.
Answer: paramagnetic substances.
(16) The material suitable for making electromagnets should have
[A] high retentivity and high coercivity.
[B] low retentivity and low coercivity.
[C] high retentivity and low coercivity.
[D] low retentivity and high coercivity.
Answer: high retentivity and low coercivity.
(17) Curie temperature is the temperature above which
[A] a ferromagnetic material becomes paramagnetic.
[B] a ferromagnetic material becomes diamagnetic.
[C] a paramagnetic material becomes diamagnetic.
[D] a paramagnetic material becomes ferromagnetic.
Answer: a ferromagnetic material becomes paramagnetic.
(18) Three needles N1 N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet, when brought close to them, will
[A] attract N1 strongly, but repel N2 and N3 weakly.
[B] attract all three of them.
[C] attract N1 and N2 strongly but repel N3.
[D] attract N1 strongly, N2 weakly and repel N3 weakly.
Answer: attract N1 strongly, N2 weakly and repel N3 weakly.
(19) A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetisation is then is
[A] 3 π Am-1
[B] 30000 π Am-1
[C] 300 Am-1
[D] 30000 Am-1
Answer: 30000 Am-1
(20) A magnetic needle is kept in a non-uniform magnetic field. It experiences
[A] a torque but not a force.
[B] neither a force nor a torque.
[C] a force and a torque.
[D] a force but not a torque.
Answer: a force and a torque.

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