12th Class Physics Magnetism Question Bank

done Assertion And Reason (MCQs) - Magnetism and Matter Total Questions - 22

• question_answer1)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When a bar magnet is freely suspended, it points in the north-south direction.

  Reason (R): The Earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to north.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer2)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic force between two short magnets, when they are co-axial follows inverse saquare law of distance.

  Reason (R): The magnetic forces between two poles do not follow inverse square law of distance.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer3)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Gauss's law of magnetism is different from that for electrostatics.

  Reason (R): Isolated magnetic poles are not known to exist.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer4)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Earth's magnetic field does not affect the working of a moving coil glavanometer.

  Reason (R): The Earth's magnetic field as quite weak as compared to magnetic field produces in the moving coil galvanometer.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer5)
                    

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The magnetic field lines of the Earth resemble that of a magnetic dipole located at the centre of the Earth.

  Reason (R): The axis of the dipole coincide with the axis of rotation of the Earth.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer6)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: In water, value of magnetic field decreases.

  Reason (R): Water is a diamagnetic substance.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer7)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When diamagnetic material is placed in a non-uniform magnetic field, it tends to move from stronger to the weaker part of the magnetic field.

  Reason (R): Diamagnetic materials possess strong magnetism.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer8)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The ability of a material to permit the passage of magnetic lines of force through it is called magnetic permeability.

  Reason (R): For a perfect diamagnetic substance, permeability is always one.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer9)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.

  Reason (R): A charged particle produces a magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer10)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The Earth's magnetic field is due to iron present in its core.

  Reason (R): At a low temperature magnet losses its magnetic property or magnetism.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer11)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The ends of a magnet suspended freely point out always along north south.

  Reason (R): Earth behaves as a huge magnet.

     
  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer12)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: A compass needle when placed on the magnetic north pole of the Earth rotates in vertical direction.

  Reason (R): The Earth has only horizontal component of its magnetic field at the north poles.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer13)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: At neutral point, a compass neddle point out in any arbitrary direction.

  Reason (R): Magnetic field of Earth is balanced by field due to magnets at the neutral points.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer14)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic moment is measured in joule/tesla or amp \[{{m}^{2}}\].

  Reason (R): Joule/tesla is equivalent to amp \[{{m}^{2}}\].

  A)

  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]

  done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer15)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: A clinic lines on the magnetic map represents lines of equal dip.

  Reason (R): When the horizontal and vertical components of the Earth's magnetic field are equal, the angle of dip is \[60{}^\circ \].

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer16)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The true geographic north direction is found by using a compass needle.

  Reason (R): The magnetic meridian of the Earth is along the axis of rotation of the Earth.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
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• question_answer17)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: There is only one neutral point an a horizontal board when a magnet is held vertically on the board.

  Reason (R): At the neutral point the net magnetic field due to the magnetic field of the Earth is zero.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer18)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The poles of magnet cannot be separated by breaking into two pieces.

  Reason (R): The magnetic moment will be reduced to half when a magnet is broken into two equal pieces.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer19)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.

  Reason (R): A charged particle produces a magnetic field.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer20)
                        

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: Magnetism is relativistic.

  Reason (R): When we move along with the charge so that there is no motion relative to us, we find no magnetic field associated with the charge.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer21)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.

  Reason (R): Magnetic moment depends on area of the Loop.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false done clear
  View Solution play_arrow

• question_answer22)

  Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

  Assertion [A]: The Earth's magnetic field does not affect the working of a moving coil galvanometer.

  Reason (R): Earth's magnetic field is very weak.

  A)
  Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A] done clear
  B)
  Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A] done clear
  C)
  Assertion [A] is true but Reason (R) is false done clear
  D)
  Assertion [A] is false and Reason (R) is also false   done clear
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