12th Class Physics Electro Magnetic Induction Question Bank

done Assertion And Reason (MCQs) - Electromagnetic Induction Total Questions - 26

• 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]: Changing magnetic flux can produced induced emf.

  Reason (R):  Faraday established induced emf experimentally.

  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]: The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.

  Reason (R): Magnetic flux is essential to maintain an induced current in the coil.

  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]: Only a change in magnetic flux will maintain an induced current the coil.

  Reason (R): The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.

  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]: The induced emf in a conducting loop of wire will be non zero when it rotates in a uniform magnetic field.

  Reason (R): The emf is induced due to change in magnetic flux.

  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]: Induced emf depends on number of turns and area of the coil.

  Reason (R): Induced emf increases with increases in number of turns of coil.

  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]: Faraday's laws are consequences of conservation of energy.

  Reason (R): In a purely resistive ac circuit, the current lags behind the emf in phase.

  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]: An induced emf is generated when magnet is withdrawn from the solenoid.

  Reason (R): The relative motion between magnet and solenoid induces emf.

  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]: An aircraft flies along the meridian, the potential develops at the ends of its wings.

  Reason (R): Whenever there is change in the magnetic flux emf induces.

  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]: Sensitive electrical instruments should not be placed in the vicinity of an electromagnet.

  Reason (R): Magnetic flux is essential to maintain and induced current in the coil.

                              
  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]: A spark occur between the poles of a switch when the switch is opened.

  Reason (R): Current flowing in the conductor produces 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_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]: A copper sheet placed in a magnetic field. If we pull it out of the field or push it into the field, we experience of opposing force.

  Reason (R): According to Lenz's law, eddy current produced in sheet opposes the motion of the sheet.

  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]: It is more difficult to push a magnet into a coil with more loops.

  Reason (R): emf induced in the current Loop resists the motion of the 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_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]: The direction of induced emf is always such that it opposes change that causes it.

  Reason (R): Conservation of energy applies to know the direction of induced emf.

  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]: Acceleration of a magnet falling through a copper ring decreases.

  Reason (R): The induced current produced in a circuit always flow in such direction that it opposes the change or the cause that produced.

  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]: Eddy currents heat up the core and dissipate electrical energy in the form of heat.

  Reason (R): Eddy currents are always undesirable.

  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]: When two coils are wound on each other, the mutual induction between the coils is maximum.

  Reason (R): Mutual induction does not depend on the orientation of the coils.

  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]: In the phenomenon of mutual induction, self induction of each of the coils persists.

  Reason (R): Self induction arises when strength of current in same coil changes. In mutual induction, current is changing in both the individual coils.

  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_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]: In the phenomenon of mutual induction, self induction of each of the coil persists.

  Reason (R): Self induction arises when strength of current in one coil change. In mutual induction, current is changing in both the individual coils.

  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_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]: When number of turns in a coil doubled. coefficient of self inductance of the coil becomes four times.

  Reason (R): Coefficient of self inductance is proportional to the square of number of turns.

  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_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]: Self-inductance is called the inertia of electricity.

  Reason (R): Self-inductance is the phenomenon, according to which an opposing induced emf is produced in a coil as a result of change in current of magnetic flux linked in the coil.

  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_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]: Mutual inductance of a pair of coils depend on their separation as well as their relative orientation.

  Reason (R): Mutual inductance depend upon the length of the coil only.

  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_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]: When two coils are wound on each other, the mutual induction between the coils is maximum.

  Reason (R): Mutual induction is independent of the orientation of the coils.

  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_answer23)

  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 self-inductance of a long solenoid is proportional to the area of cross-section and length of the solenoid.

  Reason (R): Self inductance of a solenoid is independent of the number of turns per unit length.

  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_answer24)

  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 quantity L/R possesses dimensions of time.

  Reason (R): To reduce the rate of increases of current through a solenoid should increase the time constant (L/R).

  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_answer25)

  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 the current in a coil changes, it induces a back emf in the same coil.

  Reason (R): emf is a measure of the intertia of the coil against the change of current through it.

  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_answer26)

  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]: Inductance coil are made of copper.

  Reason (R): Induced current is more in wire having less resistance.

  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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