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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>
(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
(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:
[C]
(a) Lm = Lg
[D]
Lm = 2RY;UL Lg
(5)
The force acting per unit length of a semi circular wire of radius R carrying a current I is:
(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’? ,
(8)
Ferrites may be:
[A]
ant. ferromagnetic
[B]
ferromagnetic
[C]
ferrimagnetic
[D]
None of the above
(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
(10)
A magnetic bar of M magnetic moment is placed m the field of magnetic strength B, the torque acting on it is :
(11)
The dimensional representation of
is similar to that of:
[A]
frequency
[B]
time
[C]
distance
[D]
speed
(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°
(13)
S.I. unit of flux is :
[A]
Ohm
[B]
Weber
[C]
Tesla
[D]
None
(14)
The dimensional representation of magnetic flux density is :
[A]
[MLT-2]
[B]
[MLT-2A-1]
[C]
[MLT-2A-2]
[D]
[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
(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
(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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