Chapter 15 Electromagnetic Induction Physics 12th Class Punjab MCQ Tests
12th Class Physics Chapter 15 MCQ Tests
Chapter 15 of 12th Class Physics has 30 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 30
Total Marks: 30
Time: 30 Mins
Total Questions: 30
Total Marks: 30
Time: 30 Mins
30Min : 00 Sec Remaining
Question # 1
A bar magnet with the North Pole faced downward is dropped above a horizontal circular coil. Which of the following statements about the induced current is true (viewed from above)?
Question # 2
What is the function of soft iron core in transformer?
Question # 3
There are 200 turns in primary coil and 75 turns in secondary coil of a transformer. If 400 V alternating voltage is applied to the primary, what will be the voltage at secondary?
Question # 4
The distance between the primary and secondary coils is L. The mutual inductance is M. If the distance between the coils is increased to 2L, what will be the mutual inductance?
Question # 5
A potential difference is induced across the ends of a conducting rod as it moves in a magnetic field. Which of the following is the reason of this potential difference?
Question # 6
How can induced current be increased?
Question # 7
A rectangular coil of area 0.5 m2 and 500 turns is rotating with angular velocity of 2 rad.s−1 in a magnetic field of 0.2 T. Calculate the induced emf in the coil at the instant when angle between field and normal to the plane is 60°.
Question # 8
A current carrying coil has a 0.2 m length and 0.02 m2 cross-sectional area. The magnetic field in the coil is 0.3 T. Calculate the energy stored in the coil.
Question # 9
Magnitude of induced EMF depends on which of the following factors?
Question # 10
A current carrying solenoid is 0.3 m long and has cross sectional area of 0.05 m2. The magnetic field in the solenoid is 0.6 T. Calculate the energy stored per unit volume of the solenoid.
Question # 11
Current changes from zero to 5 A in a coil of 1000 turns in a time of 0.2 s. Calculate the magnitude of emf induced in the coil. The inductance of the coil is 2 H.
Question # 12
Which of the following factors affects the mutual inductance?
Question # 13
An emf of 75 V is induced in secondary coil due to change in current from zero to 5 A in primary coil in a time of 0.1 s. Calculate the mutual inductance.
Question # 14
A conductor of length L is moved in a magnetic field perpendicular to the field with velocity v. The magnetic field strength is B. An emf ϵ is induced in the conductor. If the length of the conductor in the field is doubled, what will be the magnitude of emf?
Question # 15
A conducting rod moves perpendicular to a field with a speed of 12 ms −1 and emf induced in the rod is 150 V. What should be the speed of the rod so that an emf of 200 V is induced?
Question # 16
Air is replaced by soft iron core in primary and secondary coils. What will be the effect on mutual inductance?
Question # 17
A power supply needs 500 W which will be given by a transformer. If 240 V is applied at the primary coil of transformer, how much current will be induced in secondary? The turn ratio is 1:3 and assume that it is an ideal step down transformer.
Question # 18
What is the source of electrical connection between primary and secondary coils of a transformer?
Question # 19
A conducting rod of length 1.3 m moves with a velocity of 15 ms −1 in a magnetic field of 6T. The angle between field and velocity is 40°. Calculate the induced emf.
Question # 20
Which of the following circuit elements stores energy in its magnetic field?
Question # 21
A rectangular coil of area 0.5 m2 and 400 turns is rotating with angular velocity of 3 rad.s−1 in a magnetic field of 0.2 T. Calculate the maximum value of induced emf in the coil.
Question # 22
The maximum value of alternating current induced in an AC generator is 15 A. Calculate the value of current at the instant of 0.4 s. The rotational speed of the generator is 20 rad.s−1.
Question # 23
The maximum value of induced emf of generator is 250 V. If the resistance of the coil of generator is 50 Ω, then calculate the maximum value of induced current.
Question # 24
A current carrying wire lies on a horizontal table. A circular coil is placed next to the loop. The current suddenly grows stronger. What is the direction of the induced current in the coil?
Question # 25
The turn ratio of a step down transformer is 1:20. If 12 V is required at secondary as output, how much voltage must be applied on primary of transformer?
Question # 26
If the current through a 5mH inductor is increasing at 3As−1 , what is the voltage across the inductor?
Question # 27
There is a magnetic flux in secondary coil due to a primary coil carrying a current. If the current through the primary coil is increased, what happens to the flux through the secondary coil?
Question # 28
An emf is induced in a conductor due to relative motion of magnet and conductor. Current I is produced when the magnetic field strength is B. What will be the current if the field is 2B?
Question # 29
A conducting rod of length 1.5 m moves with a velocity of 10 ms−1 in a magnetic field of 5 T. The velocity and field are at right angle to each other. Calculate the induced emf.
Question # 30
How will you represent the direction of a magnetic field that is directed away from you i.e. into the paper?
Total Questions
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Question # 1
A bar magnet with the North Pole faced downward is dropped above a horizontal circular coil. Which of the following statements about the induced current is true (viewed from above)?
Question # 2
What is the function of soft iron core in transformer?
Question # 3
There are 200 turns in primary coil and 75 turns in secondary coil of a transformer. If 400 V alternating voltage is applied to the primary, what will be the voltage at secondary?
Question # 4
The distance between the primary and secondary coils is L. The mutual inductance is M. If the distance between the coils is increased to 2L, what will be the mutual inductance?
Question # 5
A potential difference is induced across the ends of a conducting rod as it moves in a magnetic field. Which of the following is the reason of this potential difference?
Question # 6
How can induced current be increased?
Question # 7
A rectangular coil of area 0.5 m2 and 500 turns is rotating with angular velocity of 2 rad.s−1 in a magnetic field of 0.2 T. Calculate the induced emf in the coil at the instant when angle between field and normal to the plane is 60°.
Question # 8
A current carrying coil has a 0.2 m length and 0.02 m2 cross-sectional area. The magnetic field in the coil is 0.3 T. Calculate the energy stored in the coil.
Question # 9
Magnitude of induced EMF depends on which of the following factors?
Question # 10
A current carrying solenoid is 0.3 m long and has cross sectional area of 0.05 m2. The magnetic field in the solenoid is 0.6 T. Calculate the energy stored per unit volume of the solenoid.
Question # 11
Current changes from zero to 5 A in a coil of 1000 turns in a time of 0.2 s. Calculate the magnitude of emf induced in the coil. The inductance of the coil is 2 H.
Question # 12
Which of the following factors affects the mutual inductance?
Question # 13
An emf of 75 V is induced in secondary coil due to change in current from zero to 5 A in primary coil in a time of 0.1 s. Calculate the mutual inductance.
Question # 14
A conductor of length L is moved in a magnetic field perpendicular to the field with velocity v. The magnetic field strength is B. An emf ϵ is induced in the conductor. If the length of the conductor in the field is doubled, what will be the magnitude of emf?
Question # 15
A conducting rod moves perpendicular to a field with a speed of 12 ms −1 and emf induced in the rod is 150 V. What should be the speed of the rod so that an emf of 200 V is induced?
Question # 16
Air is replaced by soft iron core in primary and secondary coils. What will be the effect on mutual inductance?
Question # 17
A power supply needs 500 W which will be given by a transformer. If 240 V is applied at the primary coil of transformer, how much current will be induced in secondary? The turn ratio is 1:3 and assume that it is an ideal step down transformer.
Question # 18
What is the source of electrical connection between primary and secondary coils of a transformer?
Question # 19
A conducting rod of length 1.3 m moves with a velocity of 15 ms −1 in a magnetic field of 6T. The angle between field and velocity is 40°. Calculate the induced emf.
Question # 20
Which of the following circuit elements stores energy in its magnetic field?
Question # 21
A rectangular coil of area 0.5 m2 and 400 turns is rotating with angular velocity of 3 rad.s−1 in a magnetic field of 0.2 T. Calculate the maximum value of induced emf in the coil.
Question # 22
The maximum value of alternating current induced in an AC generator is 15 A. Calculate the value of current at the instant of 0.4 s. The rotational speed of the generator is 20 rad.s−1.
Question # 23
The maximum value of induced emf of generator is 250 V. If the resistance of the coil of generator is 50 Ω, then calculate the maximum value of induced current.
Question # 24
A current carrying wire lies on a horizontal table. A circular coil is placed next to the loop. The current suddenly grows stronger. What is the direction of the induced current in the coil?
Question # 25
The turn ratio of a step down transformer is 1:20. If 12 V is required at secondary as output, how much voltage must be applied on primary of transformer?
Question # 26
If the current through a 5mH inductor is increasing at 3As−1 , what is the voltage across the inductor?
Question # 27
There is a magnetic flux in secondary coil due to a primary coil carrying a current. If the current through the primary coil is increased, what happens to the flux through the secondary coil?
Question # 28
An emf is induced in a conductor due to relative motion of magnet and conductor. Current I is produced when the magnetic field strength is B. What will be the current if the field is 2B?
Question # 29
A conducting rod of length 1.5 m moves with a velocity of 10 ms−1 in a magnetic field of 5 T. The velocity and field are at right angle to each other. Calculate the induced emf.
Question # 30
How will you represent the direction of a magnetic field that is directed away from you i.e. into the paper?
Total Questions
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Physics MCQ Test by Topics
- +15.1 Induced EMF and Induced Current
- +15.2 Motional EMF
- +15.3 Faradays Law and Induced EMF
- +15.4 Lenz Law and Direction of Induced EMF
- +15.5 Mutual Induction
- +15.6 Self Induction
- +15.7 Energy Stored in an Inductor
- +15.8 Alternating Current Generator
- +15.9 D.C. Generator
- +15.10 Back Motor Effect in Generators
- +15.11 D.C. Motor
- +15.12 Back EMF Effect in Motors
- +15.13 Transformer
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Updated on: 17-05-2026
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