12th Class Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank

done Assertion And Reason (MCQs) - Magnetism and Matter Total Questions - 8

• question_answer1)

  Directions (Q. Nos.1 - 8): 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 configuration with 3 poles is not possible.

  Reason (R): No torque acts on a bar magnet itself due to its own field.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer2)

  Assertion (A): Magnetic poles cannot be separated by breaking a bar magnet into two pieces.

  Reason (R): When a magnet is broken into two pieces, the magnetic moment will be reduced to half.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer3)

  Assertion (A): The basic difference between magnetic lines of force and electric lines of force is electric lines of force are discontinuous and magnetic lines of force are continuous.

  Reason (R): Magnetic lines of force exist in a magnet but no electric lines of force exist in a charged body.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer4)

  Assertion (A): Gauss theorem is not applicable in magnetism.

  Reason (R): Magnetic monopole does not exist.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer5)

  Assertion (A): A compass needle when placed at Earth's magnetic pole rotates in vertical plane.

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

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer6)

  Assertion (A): Compass needle points the magnetic north-south direction.

  Reason (R): The magnetic meridian of the earth merges with the axis of rotation of earth.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer7)

  Assertion (A): Ferromagnetic substances become paramagnetic beyond Curie temperature.

  Reason (R): Domains are destroyed at high temperature.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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• question_answer8)
   

  Assertion (A): Gauss's law of magnetism is different from Gauss's law of electrostatics.

  Reason (R): Isolated electric charge can exist but isolated magnetic pole cannot exist.

  A)
  Both A and R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false and R is true done clear
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