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

Questions
1 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:are from S-pole to N-pole of the magnet.
2 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 B/2
D B/4

Answer:B/2
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3 In a bar magnet, magnetic lines of force z :
A are produced only at north pole like rays of light from a bulb
B starts from north pole and ends at the south pole
C emerge in circular paths from the middle of the bar
D run continuously through the bar and outside

Answer:starts from north pole and ends at the south pole
4 The relation between geometric length (L) and magnetic length (Lm) is:
A Class 12 Physics Chapter 5 Magnetism and Matter
B Class 12 Physics Chapter 5 Magnetism and Matter
C (a) Lm = Lg
D Lm = 2RY;UL Lg

Answer:Class 12 Physics Chapter 5 Magnetism and Matter
5 The force acting per unit length of a semi circular wire of radius R carrying a current I is:
A Class 12 Physics Chapter 5 Magnetism and Matter
B Class 12 Physics Chapter 5 Magnetism and Matter
C Class 12 Physics Chapter 5 Magnetism and Matter
D Class 12 Physics Chapter 5 Magnetism and Matter

Answer:Class 12 Physics Chapter 5 Magnetism and Matter
6 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:equal to that of earth
7 What is the magnetic field in the empty space enclosed by the toroidal solenoid of radius ‘R’? ,
A Infinity
B Class 12 Physics Chapter 5 Magnetism and Matter
C Class 12 Physics Chapter 5 Magnetism and Matter
D zero

Answer:zero
8 Ferrites may be:
A ant. ferromagnetic
B ferromagnetic
C ferrimagnetic
D None of the above

Answer:ferromagnetic
9 The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled keeping the current unchanged, the magnetic field at the centre of loop will become:
A B/2
B B/4
C 2B
D 4B

Answer:B/4
10 A magnetic bar of M magnetic moment is placed m the field of magnetic strength B, the torque acting on it is :
A Class 12 Physics Chapter 5 Magnetism and Matter
B Class 12 Physics Chapter 5 Magnetism and Matter
C Class 12 Physics Chapter 5 Magnetism and Matter
D Class 12 Physics Chapter 5 Magnetism and Matter

Answer:C
11 The dimensional representation of Class 12 Physics Chapter 5 Magnetism and Matter is similar to that of:
A frequency
B time
C distance
D speed

Answer:time
12 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:45°
13 S.I. unit of flux is :
A Ohm
B Weber
C Tesla
D None

Answer:Weber
14 The dimensional representation of magnetic flux density is :
A [MLT-2]
B [MLT-2A-1]
C [MLT-2A-2]
D [MT-2A-1]

Answer:[MT-2A-1]
15 In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is :
A exponential
B linear
C algebraic
D logarithmic

Answer:linear
16 A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :
A M
B M.l.
C 2M/π
D M/π

Answer:2M/π
17 Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?
A Electrostatic field lines can end on charges and conductors have free charges.
B Magnetic field lines can end but conductors cannot end them.
C Lines of magentic field cannot end on any material and perfect shielding is not possible.
D Shells of high permeability materials can be used to divert lines of magnetic field from the interior region.

Answer:Magnetic field lines can end but conductors cannot end them.
18 Which of the following property shows the property of ferromagnetic substances?
A The ferromagnetic property depends on tem-perature. ‘
B The ferromagnetic property does not depend on temperature.
C At high enough temperature ferromagnet becomes a diamagnet.
D At low temperature ferromagnet becomes a paramagnet.

Answer:The ferromagnetic property depends on tem-perature.
19 Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is
A always zero
B positive, negative or zero
C unbounded
D always negative

Answer:positive, negative or zero
20 Which of the following is responsible for the earth’s magnetic field?
A Convective currents in earth’s core
B Diversive current in earth’s core.
C Rotational motion of earth.
D Translational motion of earth.

Answer:Convective currents in earth’s core

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