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question_answer1)
Directions : (1-37) For Assertion and Reason Type Questions |
In this type of question, a statement of assertion [A] is followed by a statement of reason [R]. Mark the correct choice as : |
|
Assertion: Changing magnetic flux can produce induced e.m.f. |
Reason: Faraday established induced e.m.f. experimentally. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer2)
Assertion: A transformer cannot work on dc supply. |
Reason: dc changes neither in magnitude nor in direction. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer3)
Assertion: Induced e.m.f. depends on number of turns in coil and area of the coil both associated with changing magnetic flux. |
Reason: Induced e.m.f. increases with increase in number of turns of coil. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer4)
Assertion: Lenz's law violates the principle of conservation of energy. |
Reason: Induced e.m.f. opposes always the change in magnetic flux responsible for its production. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer5)
Assertion: The direction of induced e.m.f. is always such as to oppose the change that causes it. |
Reason: The direction of induced e.m.f. is given by Lenz's law. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer6)
Assertion: Only a change in magnetic flux will maintain an induced current in the coil. |
Reason: The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer7)
Assertion: The induced e.m.f. will be same in two identical loops of copper and aluminum, when rotated with same speed in the same magnetic field. |
Reason: Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer8)
Assertion: Faraday's laws are consequences of conservation of energy. |
Reason: In a purely resistive ac circuit, the current lags behind the e.m.f. in phase. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer9)
Assertion: Inductance coil are made of copper. |
Reason: Induced current is more in wire having less resistance. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer10)
Assertion: The quantity L/R opposses dimension of time. |
Reason: To reduce the rate of increases of current through a solenoid should increase the time constant \[\left( \frac{L}{R} \right)\]. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer11)
Assertion: Self Inductance is called the inertia of electricity. |
Reason: Self-inductance is the phenomenon, according to which an opposing induced e. m.f. is produced in a coil as a result of change or magnetic flux linked with the coil. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer12)
Assertion: Eddy currents is produced in any metallic conductor when magnetic flux is changed around it. |
Reason: Electric potential determines the flow of change. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer13)
Assertion: When two coils are wound on each other, the mutual induction between the coils is maximum. |
Reason: Mutual induction does not depend on the orientation of the coils. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer14)
Assertion: A copper sheet is placed in a magnetic field. |
If we pull it out of the field or push it into the field, we experience an opposing force. |
Reason: According to Lenz's law eddy current produced in sheet opposes the motion of the sheet. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer15)
Assertion: Acceleration of a magnet failing through a copper ring decreases. |
Reason: The induced current produced in a circuit always flow in such direction that it opposes the change or the cause produced it. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer16)
Assertion: A metal piece and a non-metal (stone) piece are dropped from the same height near earth's surface. |
Both will reach the earth's surface simultaneously. |
Reason: There is no effect of earth's magnetic field on freely falling body. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer17)
Assertion: An aircraft flies along the meridian, the potential develops at the ends of its wings. |
Reason: Whenever there is change in the magnetic flux e.m.f. induces. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer18)
Assertion: A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the cube is heated, the terminal velocity gets increased. |
Reason: The terminal velocity depends on eddy current produced in bar magnet. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer19)
Assertion: A spark occur between the poles of a switch when the switch is opened. |
Reason: Current flowing is the conductor produces magnetic field. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer20)
Assertion: An electrical motor converts mechanical energy into electrical energy. |
Reason: An electrical motor works on the principle of mutual induction. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer21)
Assertion: In the phenomenon of mutual induction, self-induction of each of the coils persists. |
Reason: Self-inductance arises when strength of current in one coil changes. In mutual induction, current is changing in both the individual coils. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer22)
Assertion: A dynamo converts mechanical energy into electrical energy. |
Reason: The dynamo is based on the principle of electromagnetic induction. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer23)
Assertion: Lenz's law is an important consequence of the principle of conservation of energy. |
Reason: Induced e.m.f. opposes always the change in magnetic flux responsible for its production. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer24)
Assertion: The back e.m.f. is a D.C. motor is maximum when the motor has just been switched on. |
Reason: When motor is switched on it has maximum speed. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer25)
Assertion: When number of turns in a coil doubled, coefficient of self-inductance of the coil becomes four times. |
Reason: Coefficient of self-inductance is proportional to the square of number of turns. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer26)
Assertion: The working of dynamo is based on the principle of self-induction. |
Reason: Self-induction of a coil numerically equal to the magnetic flux linked with the coil. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer27)
Assertion: Induced electric field due to changing magnetic flux is more readily observed than induced magnetic field due to changing electric field. |
Reason: The inducted field depends on change in flux. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer28)
Assertion: An artificial satellite with a metal surface is moving above the earth in a circular orbit. A current will be induced in satellite if the plane of the orbit is inclined to the plane of the equator. |
Reason: The current will be induced only when the speed of satellite is more than 8 km/sec. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer29)
Assertion: The coil is the resistance boxes are made by doubling the wire. |
Reason: Thick wire is required in resistance box. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer30)
Assertion: On moving a straight wire of copper in a uniform magnetic field cutting then lines of force, an e.m.f. is induced between the ends of the wire. |
Reason: The Lorentz force acts on the free electrons of copper wire when moved in magnetic field. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer31)
Assertion: An A.C. generator is based on the phenomenon of self-induction. |
Reason: In single coil, we consider self-induction as well as mutual induction both. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer32)
Assertion: An induced e.m.f. is generated when magnet is withdrawn from the solenoid. |
Reason: The relative motion between magnet and solenoid induces e.m.f. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer33)
Assertion: The induced e.m.f. in a conducting loop of wire will be non-zero when it rotates in a uniform magnetic field. |
Reason: The e.m.f. is induced due to change in magnetic flux. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer34)
Assertion: An induced current is developed when the number of magnetic lines of force associated with conductor is changed. |
Reason: An induced current develops in a conductor moved in a direction parallel to the magnetic field. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer35)
Assertion: The phenomenon of self-induction is helpful in working of a choke coil. |
Reason: A choked is used for reducing energy loss in the circuit. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer36)
Expected Questions
Assertion: The possibility of an electric bulb fusing is higher at the time of switching on and off. |
Reason: Inductive effects produce a surge at the time of switch off and switch on. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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question_answer37)
Assertion: An e.m.f. is induced in a closed loop where magnetic flux is varied. The induced electric field in it is not a conservative field. |
Reason: The line integral around the closed loop is non-zero. |
A)
If both assertion and reason are true and reason is the correct explanation of assertion. done
clear
B)
If both assertion and reason are true and reason is not the correct explanation of assertion. done
clear
C)
if assertion is true but reason is false. done
clear
D)
If both assertion and reason are false. done
clear
E)
If assertion is false but reason is true. done
clear
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