CBSE Class 12 Physics Magnetism and Matter MCQs Set D

Question: The angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic field are equal is
a) 30°
b) 75°
c) 60°
d) 45°
Answer: d

Question: The earth behaves as a magnet with magnetic field pointing approximately from the geographic
a) North to South
b) South to North
c) East to West
d) West to East
Answer: b

Question: Which of the following property shows the property of ferromagnetic substances?
a) The ferromagnetic property depends on temperature.
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: a

Question: Which of the following independent quantities is not used to specify the earth’s magnetic field?
a) Magnetic declination (q).
b) Magnetic dip (d).
c) Horizontal component of earth’s field (BH).
d) Vertical component of earth’s field (BV).
Answer: d

Question: The strength of the earth’s magnetic field is
a) constant everywhere.
b) zero everywhere.
c) having very high value.
d) vary from place to place on the earth’s surface.
Answer: d

Question: The primary origin of magnetism lies in
a) atomic current and intrinsic spin of electrons.
b) polar and non-polar nature of molecules.
c) Pauli exclusion principle.
d) electronegative nature of materials.
Answer: a

Question: Magnetic moment for solenoid and corresponding bar magnet is
a) equal for both
b) more for solenoid
c) more for bar magnet
d) none of these
Answer: a

Question: 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: c

Question: 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: a

Question: At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 10⁻⁵ T and resultant magnetic field is 4 × 10⁻⁵ T. The angle of dip at this place is
a) 30°
b) 60°
c) 90°
d) 45°
Answer: b

Question: 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: b

Question: Which of the following is correct about magnetic monopole?
a) Magnetic monopole exist.
b) Magnetic monopole does not exist.
c) Magnetic monopole have constant value of monopole momentum.
d) The monopole momentum increase due to increase at its distance from the field.
Answer: b

Question: 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 magnetic 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: b

Read the two statements Assertion (A) and Reason (R) carefully to mark the correct option out of the options given below:
(a) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.
(b) Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.
(c) Assertion is correct statement but Reason is wrong statement.
(d) Assertion is wrong statement but Reason is correct statement.

Question:
Assertion: Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason: A charged particle produces a magnetic field.
Answer: c

Question:
Assertion: The ends of a magnet suspended freely point out always along north south.
Reason: Earth behaves as a hugs magnet.
Answer: a

Question:
Assertion: At neutral point, a compass needle point out in any arbitrary direction.
Reason: Magnetic field of earth is balanced by field due to magnets at the neutral points.
Answer: a

Question:
Assertion: Earth’s magnetic field does not affect the working of a moving coil galvanometer.
Reason: The earth’s magnetic field is quite weak as compared to magnetic field produced in the moving coil galvanometer.
Answer: a

Question:
Assertion: The true geographic north direction is found by using a compass needle.
Reason: The magnetic meridian of the earth is along the axis of rotation of the earth.
Answer: d

Question:
Assertion: The earth’s magnetic field is due to iron present in its core.
Reason: At a low temperature magnet losses its magnetic property is magnetism.
Answer: d

Question:
Assertion: A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction.
Reason: The earth has only vertical component of its magnetic field at the north poles.
Answer: d

Question:
Assertion: Magnetic moment is measured in joule/tesla or amp md.
Reason: Joule/tesla is equivalent to amp m2.
Answer: a

Question:
Assertion: A clinic lines on the magnetic map represents lines of equal dip.
Reason: When the horizontal and vertical components of the earth magnetic field are equal, the angle of dip is 45º.
Answer: d

Question:
Assertion: There is only one neutral point on a horizontal board when a magnet is held vertically on the board.
Reason: At the neutral point the net magnetic field due to the magnetic and magnetic field of the earth is zero.
Answer: b