In This Post we are providing Chapter-5 Magnetism and Matter NCERT MCQ for Class 12 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON MAGNETISM AND MATTER
Question 1.
S.I. unit of flux is :
(a) Ohm
(b) Weber
(c) Tesla
(d) None
Answer: (b) Weber
Question 2.
What is the angle of dip at a place where the horizontal component of earth’s magnetic field is equal to the vertical component?
(a) 0°
(b) 30°
(c) 45°
(d) 90°
Answer: (c) 45°
Question 3.
Which of the following has a low value in ferrites?
(a) Conductivity
(b) Permeability
(c) Magnetic susceptibility
(d) All the above
Answer: (a) Conductivity
Question 4.
The dimensional representation of magnetic flux density is :
(a) [MLT-2]
(b) [MLT-2A-1]
(c) [MLT-2A-2]
(d) [MT-2A-1]
Answer: (d) [MT-2A-1]
Question 5.
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: (a) two uniform and mutually perpendicular magnetic fields exist
Question 6.
Ferrites may be:
(a) ant. ferromagnetic
(b) ferromagnetic
(c) ferrimagnetic
(d) None of the above
Answer: (b) ferromagnetic
Question 7.
A magnetic bar of M magnetic moment is placed m the field of magnetic strength B, the torque acting on it is :
(a) M⃗ .B⃗
(b) –M⃗ .B⃗
(c) M⃗ × B⃗ .
(d) B⃗ × M⃗
Answer: (c) M⃗ × B⃗ .
Question 8.
The magnetic lines of force inside a bar magnet:
(a) do not exist
(b) depends on area of cross-section of bar magnet
(c) are from N-pole to S-pole of the magnet
(d) are from S-pole to N-pole of the magnet.
Answer: (d) are from S-pole to N-pole of the magnet.
Question 9.
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: (a) S to N
Question 10.
What is the magnetic field in the empty space enclosed by the toroidal solenoid of radius ‘R’? ,
(a) Infinity
(b) µ04π.2πlR
(c) µ04π.(πlR)
(d) zero
Answer: (d) zero
Question 11.
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: (a) N to S
Question 12.
The dimensional representation of√ l/MB is similar to that of:
(a) frequency
(b) time
(c) distance
(d) speed
Answer: (b) time
Question 13.
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: (a) half
Question 14.
The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?
(a) B
(b) 2B
(c) B2
(d) B4
Answer: (c) B2
Question 15.
The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:
(a) zero
(b) more than that of earth
(c) less than that of earth
(d) equal to that of earth
Answer: (d) equal to that of earth
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