Magnetism and Matter Class 12 MCQ Questions with Answers

Class 12 Moving Charges and Magnetism MCQ is one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Magnetism and Matter Class 12 which will help them all through their board test.

MCQ on Magnetism and Matter Class 12 Physics PDF with Answers

Class 12 Physics MCQ with answers are given here to Moving Charges and Magnetism. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Physics syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn Magnetism and Matter Class 12 MCQ Questions with Answers PDF download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE MCQ on Magnetism and Matter Class 12 PDF given below.

Question 1. Domain formation is the necessary feature of : 
(a) ferromagnetism
(b) diamagnetism
(c) paramagnetism
(d) all of these

Question 2. A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as : 
(a) paramagnetic
(b) diamagnetic
(c) ferromagnetic
(d) antiferromagnetic

Question 3. What happens, when a magnetic substance is heated ? 
(a) It loses its magnetism
(b) It becomes a strong magnet
(c) Does not effect the magnetism
(d) Either (b) and (c)

Question 4. The best material for the core of a transformer is
(a) mild steel
(b) stainless steel
(c) soft iron
(d) hard steel 

Question 5. There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted
(i) A is feebly repelled
(ii) B is feebly attracted
(iii) C is strongly attracted
(iv) D remains unaffected
Which one of the following is true?
(a) B is of a paramagnetic material
(b) C is of a diamagnetic material
(c) D is of a ferromagnetic material
(d) A is of a non-magnetic material 

Question 6. Liquid oxygen remains suspended between two pole forces of a magnet because it is : 
(a) diamagnetic
(b) paramagnetic
(c) ferromagnetic
(d) antiferromagnetic

Question 7. The magnetic susceptibility is negative for
(a) ferromagnetic material only
(b) paramagnetic and ferromagnetic materials
(c) diamagnetic material only
(d) paramagnetic material only 

Question 8. A magnet makes 40 oscillation per minute at a place having magnetic intensity of 0.1 × 10–5 tesla. At another place it takes 2.5 sec to complete one oscillation. The value of earth’s horizontal field at that place is 
(a) 0.76 × 10^–6 tesla
(b) 0.18 × 10^–6 tesla
(c) 0.09 × 10^–6 tesla
(d) 0.36 × 10^–6 tesla

Question 9. The magnetic susceptibility of an ideal diamagnetic substance is 
(a) –1
(b) 0
(c) +1
(d) ¥

Question 10. For protecting a sensitive equipment from the external magnetic field, it should be
(a) surrounded with fine copper sheet
(b) placed inside an iron can
(c) wrapped with insulation around it when passing current through it
(d) placed inside an aluminium can

Question 11. Curie temperature is the temperature above which 
(a) a ferromagnetic material becomes paramagnetic
(b) a paramagnetic material becomes diamagnetic
(c) a ferromagnetic material becomes diamagnetic
(d) a paramagnetic material becomes ferromagnetic

Question 12. The materials suitable for making electromagnets should have 
(a) high retentivity and low coercivity
(b) low retentivity and low coercivity
(c) high retentivity and high coercivity
(d) low retentivity and high coercivity

Question 13. Electromagnets are made of soft iron because soft iron has
(a) low retentivity and high coercive force
(b) high retentivity and high coercive force
(c) low retentivity and low coercive force
(d) high retentivity and low coercive force

Question 14. A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 mA and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is
(a) 4.55 mJ
(b) 2.3 mJ
(c) 1.15 mJ
(d) 9.1 mJ

Question 15. Magnetic lines of force due to a bar magnet do not intersect because 
(a) a point always has a single net magnetic field
(b) the lines have similar charges and so repel each other
(c) the lines always diverge from a single force
(d) the lines need magnetic lenses to be made to interest

Question 16. Which one of the following are used to express intensity of magnetic field in vacuum ? 
(a) oersted
(b) tesla
(c) gauss
(d) none of these

Question 17. A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is
(a) W/√3
(b) √3W
(c) √3W /2
(d) 2W /√3

Question 18. A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be
(a) MB/F
(b) BF/M
(c) MF/B
(d) F/MB

Question 19. The north pole of a magnet is brought near a metallic ring. Then the direction of the induced current in the ring will be: 
(a) Towards north
(b) Towards south
(c) Anticlockwise
(d) Clockwise

Question 20. 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√3J
(b) 3 J
(c) √3 J
(d) 3 /2 J

Question 21. A short bar magnet of magnetic moment 0.4 J T–1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
(a) 0.064 J
(b) –0.064 J
(c) zero
(d) –0.082 J 

Question 22. Angle of dip is 90° at:
(a) Equator
(b) Middle point
(c) Poles
(d) None of these

Question 23. A closely wound solenoid of 2000 turns and area of cross-section 1.5 × 10^–4 m² carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field 5 × 10^–2 tesla making an angle of 30° with the axis of the solenoid.
The torque on the solenoid will be
(a) 3 × 10^–3 N m
(b) 1.5 × 10^–3 N m
(c) 1.5 × 10^–2 N m
(d) 3 × 10^–2 N m

Question 24. A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth’s horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth’s field by placing a current carrying wire, the new time period of magnet will be
(a) 1 s
(b) 2 s
(c) 3 s
(d) 4 s

Question 25. A magnet 10 cm long and having a pole strength 2 amp m is deflected through 30° from the magnetic meridian. The horizontal component of earth’s induction is 0.32´10^-4 tesla then the value of deflecting couple is: 
(a) 32 ´10^-7Nm
(b) 16 ´10^-7Nm
(c) 64 ´10^-7Nm
(d) 48 ´10^-7Nm

Question 26. A bar magnet having a magnetic moment of 2 × 10⁴ J T^–1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 × 10^–4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60° from the field is
(a) 12 J
(b) 6 J
(c) 2 J
(d) 0.6 J

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Question 27. A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of each part will be
(a) M
(b) 2M
(c) zero
(d) 0.5M 

Question 28. Which one of the following statement is not correct about the magnetic field ? 
(a) Inside the magnet the lines go from north pole to south pole of the magnet
(b) Tangents to the magnetic lines give the direction of the magnetic field
(c) The magnetic lines form a closed loop
(d) Magnetic lines of force do not cut each other

Question 29. At a point A on the earth’s surface the angle of dip,d = +25°. At a point B on the earth’s surface the angle of dip, d = –25°. We can interpret that
(a) A and B are both located in the southern hemisphere.
(b) A and B are both located in the northern hemisphere.
(c) A is located in the southern hemisphere and B is located in the northern hemisphere.
(d) A is located in the northern hemisphere and B is located in the southern hemisphere.

Question 30. The work done in turning a magnet of magnetic moment M by an angle of 90° from the meridian, is n times the corresponding work done to turn it through an angle of 60°. The value of n is given by
(a) 1/2
(b) 1/4
(c) 2
(d) 1 

Question 31. A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
(a) will become rigid showing no movement
(b) will stay in any position
(c) will stay in north-south direction only
(d) will stay in east-west direction only 

Question 32. Tangent galvanometer is used to measure
(a) potential difference
(b) current
(c) resistance
(d) charge.

Question 33. If q1 and q2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip q is given by
(a) tan²Θ = tan²Θ₁ + tan²Θ₂
(b) cot²Θ = cot²Θ₁ – cot²Θ₂
(c) tan²Θ = tan²Θ₁ – tan²Θ₂
(d) cot²Θ = cot²Θ₁ + cot²Θ₂ 

Question 34. At a certain place, the angle of dip is 30º and the horizontal component of earth’s magnetic field is 0.50 oerested. The earth’s total magnetic field (in oerested) is
(a) √3
(a) 1
(a) 1√3
(a) 1/2

Question 35. Work done in turning a magnet of magnetic moment M by an angle of 90º from the mgnetic meridian is n times the corresponding work done to turn through an angle of 60º, where n is
(a) 1/2
(b) 2
(c) 1/4
(d) 1

Question 36. At a temperatur of 30°C, the susceptibility of a ferromagnetic material is found to be c . Its susceptibility at 333°C is 
(a) c
(b) 0.5 c
(c) 2c
(d) 11.1c

Question 37. A steel wire of length l has a magnetic moment M. It is then bent into a semicircular arc. The new magnetic moment is
(a) M/π
(a) 2M/π
(a) 3M/π
(a) 4M/π

Question 38. The moment of a magnet (15 cm × 2 cm × 1 cm) is 1.2 A-m². What is its intensity of magnetisation?
(a) 4 × 104 A m^–1
(b) 2 × 104 A m^–1
(c) 104 A m^–1
(d) None of these

Question 39. A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy.The work required to do this comes from
(a) the current source (b) the magnetic field
(c) the lattice structure of the material of the rod
(d) the induced electric field due to the changing magnetic field 

Question 40. Two points A and B are situated at a distance x and 2x respectively from the nearer pole of a magnet 2 cm long. The ratio of magnetic field at A and B is
(a) 4 : 1 exactly
(b) 4 : 1 approximately
(c) 8 : 1 approximately
(d) 1 : 1 approximately

Question 41. The magnetic moment of a diamagnetic atom is
(a) much greater than one
(b) 1
(c) between zero and one
(d) equal to zero 

Question 42. If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is
(a) repelled by the north pole and attracted by the south pole
(b) attracted by the north pole and repelled by the south pole
(c) attracted by both the poles
(d) repelled by both the poles 

Question 43. Two bar magnets of the same mass, same length and breadth but having magnetic moments M and 2M are joined together pole for pole and suspended by a string. The time period of assembly in a magnetic field of strength H is 3 seconds. If now the polarity of one of the magnets is reversed and combination is again made to oscillate in the same field, the time of oscillation is
(a) √3 sec
(b) 3 √3 sec
(c) 3 sec
(d) 6 sec

Question 44. If relative permeability of iron is 2000. Its absolute permeability in S.I. units is
(a) 8π × 10^–4
(b) 8π × 10^–3
(c) 800/π
(d) 8π × 109/π

Question 45. Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth’s magnetic field with like poles together. 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is 
(a) 3 : 1
(b) 1 : 3
(c) 3 : 5
(d) 5 : 4

Question 46. According to Curie’s law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to
(a) T²
(b) I / T
(c) T
(d) I / T²

Question 47. If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by md, mp and mf respectively, then
(a) md = 0 and mp ≠ 0
(b) md ≠ 0 and mp = 0
(c) mp = 0 and mf ≠ 0
(d) md ≠ 0 and mf ≠ 0.

Question 48. The magnetic moment of a diamagnetic atom is
(a) equal to zero
(b) much greater than one
(c) unity
(d) between zero and one

Question 49. The magnetic materials having negative magnetic susceptibility are
(a) non-magnetic
(b) para magnetic
(c) dia magnetic
(d) ferro magnetic

Question 50. According to Curie’s law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to
(a) 1/T
(b) T
(c) 1/T2
(d) T2 

Question 51. A bar magnet 8 cms long is placed in the magnetic merdian with the N-pole pointing towards geographical north. Two netural points separated by a distance of 6 cms are obtained on the equatorial axis of the magnet. If horizontal component of earth’s field = 3.2 × 10^–5 T, then pole strength of magnet is
(a) 5 ab-amp × c
(b) 10 ab-amp × cm
(c) 2.5 ab-amp × cm
(d) 20 ab-amp × cm

Question 52. A diamagnetic material in a magnetic field moves
(a) from stronger to the weaker parts of the field
(b) from weaker to the stronger parts of the field
(c) perpendicular to the field
(d) in none of the above directions 

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