Electromagnetic Induction and Alternating Current MCQ. We covered all the Electromagnetic Induction and Alternating Current MCQ in this post for free so that you can practice well for the exam.
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MCQ on Electromagnetic Induction and Alternating Current for NEET Students
A 240-volt a.c. the source is connected across a pure inductor of inductance 0.60 henry. If the frequency of the source is 60 Hz, the current passing through the inductor is
(A) 4.55 ampere
(B) 1.1 ampere
(C) 0.455 ampere
(D) 3.55 ampere
Option b – 1.1 ampere
Which of the following statement is true? In a purely inductive circuit containing inductor only …….. ( Electromagnetic Induction and Alternating Current MCQ )
(A) e.m.f leads current by an angle of 90°
(B) e.m.f lags current by an angle of 90°
(C) e.m.f and current are in phase
(D) e.m.f leads current by the angle of 180°
Option a – e.m.f leads current by an angle of 90°
Which of the following statement is false?
(A) Eddy current causes damping.
(B) Eddy current causes heating.
(C) Eddy current causes loss of energy.
(D) Eddy’s current causes sparking.
Option d – Eddy’s current causes sparking.
……… has no effect of pure inductive ( Electromagnetic Induction and Alternating Current MCQ )
(B) direct current
(C) root mean square current
(D) none of the above.
Option b – direct current
The unit of magnetic flux in the C.G.S system is
(A) weber
(B) gauss
(C) maxwell
(D) tesla
Option c – maxwell
The value of self-inductance of a circular coil is directly proportional to ( Electromagnetic Induction and Alternating Current MCQ )
(A) the cube of its number of turns.
(B) square of its number of turns.
(C) the square root of its number of turns
(D) cube root of its number of turns.
Option b – square of its number of turns.
A 0.4-henry inductor is connected across 120 V 60 Hz a.c. source. The current in the inductor will be very nearly
(A) 4.55 ampere
(B) 0.355 ampere
(C) 0.796 ampere
(D) 3.55 ampere
Option c – 0.796 ampere
Which of the following statement is correct? ( Electromagnetic Induction and Alternating Current MCQ )
(A) Resistance is independent of the frequency of a.c.
(B) Resistance is dependent on the frequency of a.c.
(C) Capacitive reactance is independent of the frequency of a.c.
(D) Impedance is independent of the frequency of a.c.
Option a – Resistance is independent of the frequency of a.c.
The current in a coil decreases from 0.5 A to 0.2 A in 5 s. Calculate the coefficient of self-inductance if induced e.m.f is 0.5 volt.
(A) 1.333 H
(B) 2.66 H
(C) 8.33 H
(D) 4.33 H
Option c – 8.33 H
In general, in an alternating current circuit ( Electromagnetic Induction and Alternating Current MCQ )
(A) the average value of the current is zero.
(B) the average value of the square of the current is zero.
(C) average power dissipation is zero.
(D) the phase difference between voltage and current is zero.
Option a – the average value of the current is zero.
The magnetic flux across a certain area is equal to the
(A) vector product of the vector field and the vector area.
(B) product of the vector field and the scalar area.
(C) product of the scalar field and the scalar area.
(D) scalar product of the vector field and the vector area.
If the current of 50 A flowing the primary coil is made zero in 0.2 s, then the e.m.f induced in the secondary coil is 2 volts. The mutual inductance between the coils is ( Electromagnetic Induction and Alternating Current MCQ )
(A) 8 mH
(B) 1.8 H
(C) 0.8 H
(D) 0.8 mH
Option a – 8 mH
Which one of the following is a wrong statement?
(A) An e.m.f can be induced between the ends of a straight conductor by moving it through a uniform magnetic field.
(B) The self-induced e.m.f produced by changing the current in a coil always tends to decrease the current.
(C) Inserting an iron core in a coil increases its coefficient of self-induction.
(D) According to Lenz’s law, the direction of the induced e.m.f. is such that it opposes the change in flux that causes it.
Option b – The self-induced e.m.f produced by changing the current in a coil always tends to decrease the current.
Calculate the self-inductance of the coil if an e.m.f of 12 V is induced in it when the current in it changes at the rate of 50 amperes per minute. ( Electromagnetic Induction and Alternating Current MCQ )
(A) 8.96 H
(B) 14.4 H
(C) 12.4 H
(D) 16.8 H
Option b – 14.4 H
How does the current in an RC circuit vary when the charge on the capacitor builds up?
(A) It increases linearly.
(B) It increases exponentially.
(C) It decreases linearly.
(D) It decreases exponentially.
Option d – It decreases exponentially.
Two identical circular metal coils A and B are kept on a table in such a way that they are very close, but they do not touch each other. Coil A carries a current and it is slowly increased. What is the response of coil B?
(A) B is attracted by A.
(B) B is repelled by A.
(C) B is not affected.
(D) B is first attracted by A and then repelled.
Option b – B is repelled by A.
Lenz’s law is applicable ( Electromagnetic Induction and Alternating Current MCQ )
(A) only in open circuits.
(B) only in closed circuits.
(C) in both opened and closed circuits.
(D) only in a uniform magnetic field.
Option b – only in closed circuits.
A circular coil of radius 10 cm has 600 turns of wire on it. The approximate value of the coefficient of self-induction of the coil will be
(A) 0.05 H
(B) 0.02 H
(C) 0.07 H
(D) 0.09 H
Option c – 0.07 H
When flux decreases, e.m.f induced is ( Electromagnetic Induction and Alternating Current MCQ )
(A) positive.
(B) negative.
(C) zero.
(D) infinite.
Option a – positive.
In mutual induction, the main current remains the same because
(A) the induced current is produced in the secondary coil.
(B) the induced current is produced in the primary coil.
(C) the induced current is not produced.
(D) the induced current is produced in both primary and secondary coils.
Option a – the induced current is produced in the secondary coil.
When the north pole of the magnet is brought towards the coil, the current generated in the coil flows in ……….. ( Electromagnetic Induction and Alternating Current MCQ )
(A) clockwise direction
(B) anticlockwise direction
(C) periodically
(D) sinusoidal manner
Option b – anticlockwise direction
A coil of area 80 square cm and 100 turns is rotating with 2000 revolutions per minute about an axis perpendicular to a magnetic field of 0.05 tesla. The maximum value of the e.m.f developed in it is
(A) 0.084 π volt
(B) 0.84 volt
(C) 8.4 volt
(D) 84 volt
Option c – 8.4 volt
Ohm-second is also termed as ……… ( Electromagnetic Induction and Alternating Current MCQ )
(A) farad
(B) volt
(C) henry
(D) siemens
Option c – henry
Calculate the magnetic flux linked with the coil of 200 turns and area 10 cm² when placed in a magnetic field of 0.4 T where normal to the plane of the coil makes an angle of 60° with the direction of the magnetic field.
(A) 20 Wb
(B) 20 mWb
(C) 40 Wb
(D) 40 mWb
Option d – 40 mWb
If a magnet is moved towards a coil, the magnitude of induced e.m.f in the coil is independent of i. velocity of the magnet. ii. length of the magnet. iii. the breadth of the magnet. iv. the density of the magnet. ( Electromagnetic Induction and Alternating Current MCQ )
(A) i, ii, iii
(B) ii, iii, iv
(C) i, iii, iv
(D) i, ii, iv
Option b – ii, iii, iv
Two coils are placed close to each other. The mutual inductance of the pair of coils does not depend upon i. the currents in the two coils. ii. the rates at which currents are changing in the two coils. iii. the relative position and orientation of the two coils. iv. the materials of the wires of the coils.
(A) i, iii and iv
(B) i, ii, and iv
(C) ii, iii and iv
(D) i, ii and iii
Option b – i, ii, and iv
Capacitive reactance in an A.C. circuit is ( Electromagnetic Induction and Alternating Current MCQ )
(A) the effective voltage across the capacitor connected to the circuit.
(B) effective wattage of the capacitor connected to the circuit.
(C) effective capacity of the capacitor connected to the circuit.
(D) effective resistance offered by the capacitor to the flow of A.C.
Option d – effective resistance offered by the capacitor to the flow of A.C
A coil having 600 square loops on each side 30 cm is placed normally to a magnetic flux which increases at the rate of 2 tesla/ second. The induced e.m.f in volts is
(A) 108 V
(B) 120 V
(C) 102 V
(D) 125 V
Option a – 108 V
The frequency of an alternating voltage is 60 cycles/s and its peak emf is 100 V. Then the r.m.s value of voltage is ( Electromagnetic Induction and Alternating Current MCQ )
(A) 101.3 V
(B) 84.8 V
(C) 70.7 V
(D) 56.5 V
Option c – 70.7 V
Which of the following instruments does not make use of eddy currents? ( Electromagnetic Induction and Alternating Current MCQ )
(A) Electrical brakes.
(B) Induction motor.
(C) Transformer.
(D) Deadbeat galvanometer.
Option c – Transformer.
What will be the e.m.f induced in the coil having an area of 0.2 m² and having 400 turns on it, when the magnetic field of 0.5 T gets linked perpendicular to its area, the magnetic field changes to 1 T in 0.5 s.
(A) 20 V
(B) 80 V
(C) 100 V
(D) 40 V
Option b – 80 V
Calculate the value of self-inductance of a coil when an e.m.f of 6 V is produced by a self-inductance when the current in it changes at a steady rate from 3 A to 1 A in 1 ms. ( Electromagnetic Induction and Alternating Current MCQ )
(A) 1 mH
(B) 3 mH
(C) 9 mH
(D) 6 mH
Option b – 3 mH
Electrons generally follow the straight-line path between two successive collisions in a metal. The statement is
(A) incorrect.
(B) correct in absence of an electric field.
(C) correct in presence of the electric field.
(D) correct in presence of the electromagnetic field.
Option b – correct in absence of an electric field.
Copper wire is not used preferably in potentiometer because i. resistivity of copper is small ii. temperature coefficient of resistance for copper wire is large iii. copper wire is highly sensitive iv. copper wire has a high potential gradient
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iv)
(D) (i) and (ii)
Option d – (i) and (ii)
A filament bulb (320 W, 60 V) is to be used in a 220 V main supply. When a resistance is connected in series, it works perfectly and the bulb consumes 320 W. The value of R is ( Electromagnetic Induction and Alternating Current MCQ )
(Α) 13 Ω
(Β) 30 Ω
(C) 46 Ω
(D) 26 Ω
Option b – 30 Ω
A sumo has a stereo system that draws a current of 500 mA when connected to a 12 V battery. The stereo is left playing from the battery for several hours while the engine is off. Finally, the battery voltage begins to drop. The radio can continue to operate until the current drops to 340 mA. At what battery voltage does the stereo stopped playing?
(A) 11.81 V
(B) 10.64 V
(C) 9.38 V
(D) 8.16 V
Option d – 8.16 V
A carbon resistor with color bands yellow, red, and orange and a tolerance strip is found to have a resistance of 39.9 k2, then the tolerance strip is likely to be of ……… color
(A) grey
(B) gold
(C) Silver
(D) no
Option b – gold
The current in a simple series circuit is 8 A. When an additional resistance of 2 is introduced, the current is reduced to 6 A, and the resistance of the original circuit is Assume that the applied potential difference is the same in both cases. ( Electromagnetic Induction and Alternating Current MCQ )
(A) 10 Ω
(Β) 8.6 Ω
(C) 6 Ω
(D) 3 Ω
Option c – 6 Ω
In how many more combinations of two identical and one different resistor can be connected than all three identical resistances?
(A) 1
(B) 2
(C) 3
(D) 4
Option b – 2
A wire of copper is taken and connected with a wire of iron of the same dimensions first in series and then in parallel, amongst two wires, the wire that will glow first is ( Electromagnetic Induction and Alternating Current MCQ )
(A) copper
(B) iron
(C) copper in series combination and iron in parallel combination
(D) iron in series combination and copper in parallel combination
Option d – iron in series combination and copper in parallel combination
Conceptually EMF of a cell is defined as the maximum potential difference between two electrodes of the cell
(A) when the cell is shorted.
(B) when the cell is open circuit.
(C) when unit current flows through it.
(D) when unit charge flows through it.
Option b – when the cell is open circuit.
Copper alloys are used in making standard resistances because ( Electromagnetic Induction and Alternating Current MCQ )
(A) copper has high conductivity.
(B) copper alloys have high conductivity.
(C) copper alloys have high resistivity.
(D) copper alloys are durable.
Option c – copper alloys have high resistivity.
Assertion: Silver and copper conductors of identical dimensions offer different resistances. Reason: The arrangement of atoms in silver and copper is different. ( Electromagnetic Induction and Alternating Current MCQ )
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
The direction of drift velocity is the same as the direction of ( Electromagnetic Induction and Alternating Current MCQ )
(A) applied electric field.
(B) acceleration due to the applied electric field.
(C) electric lines of force due to the electric field.
(D) all of the above.
Option b – acceleration due to the applied electric field
Two resistors have resistances in the ratio of 1 : 20, the possible combination is ( Electromagnetic Induction and Alternating Current MCQ )
(A) Red, violet, black and Yellow, violet, brown
(B) Brown, black, black and Orange, black, black
(C) Red, red, black and yellow, yellow, brown
(D) Blue, blue, green and Green, black, brown
Option c – Red, red, black and yellow, yellow, brown
If two similar types of graphs are obtained when electrical resistivity is plotted against temperature. The graphs are likely to be of ( Electromagnetic Induction and Alternating Current MCQ )
(A) Manganin and carbon
(B) nickel and carbon
(C) Manganin and nickel
(D) none of the above
Option c – Manganin and nickel
In the meter bridge experiment, the balance point is observed at l. If two resistances were doubled and then interchanged then, the new balance point will be at ( Electromagnetic Induction and Alternating Current MCQ )
(A) l
(B) 27
(C) 100 – l
(D) 2 ( 100 – l )
Option c – 100 – l
Ohm’s law does not hold well for gallium arsenide material, because ( Electromagnetic Induction and Alternating Current MCQ )
(A) current remains constant for any value of voltage.
(B) resistance is infinite.
(C) negative resistance exists in the voltage-current variation.
(D) current goes to infinite at very low voltages.
Option c – negative resistance exists in the voltage-current variation.
A steady current is flowing through a conductor of the non-uniform cross-section. The charge passing through any cross-section of it per unit of time is ( Electromagnetic Induction and Alternating Current MCQ )
(A) directly proportional to the area of the cross-section.
(B) inversely proportional to the area of the cross-section.
(C) proportional to the square of the area of the cross-section.
(D) independent of the area of the cross-section.
Option d – independent of the area of the cross-section.
In a bungalow, there are 10 bulbs of 20 W, 5 bulbs of 100 W, 4 fans of 80 W, and 2 heaters of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the bungalow will be
(A) 8 A
(B) 10 A
(C) 12 A
(D) 14 A
Option d – 14 A
Choose the correct statement ( Electromagnetic Induction and Alternating Current MCQ )
(A) Terminal potential difference of a battery is always equal to its emf.
(B) A terminal potential difference of a battery is always greater than its emf.
(C) A terminal potential difference of a battery is always smaller than its emf.
(D) none of the above
Option d – none of the above
When current is defined as the first derivative of charge with respect to time passing through a cross-section of the conductor in a definite direction, it means
(A) current is not unit current.
(B) current is a steady current.
(C) current is a variable current.
(D) current varies periodically.
Option c – current is a variable current.
Positively and negatively charged discs of dielectrics of the same radius are attached to two respective ends of a conductor then ( Electromagnetic Induction and Alternating Current MCQ )
(A) no current will flow.
(B) current will flow for a brief time.
(C) AC current will flow.
(D) steady current will flow.
Option b – current will flow for a brief time.
The resistance of a conductor is 20 ohms at 50 °C and 24 ohms at 100 °C. Its resistance at 0 °C is
(A) 1 ohm
(B) 19 ohm
(C) 16 ohm
(D) 14 ohm
Option c – 16 ohm
In the case of a potentiometer, if zero deflection occurs at a longer length than before; it means ( Electromagnetic Induction and Alternating Current MCQ )
(A) the length of the wire is halved without changing the current.
(B) length of the wire is reduced by 20 cm without changing the current.
(C) length of the wire is increased by 20 cm without changing the current.
(D) current in the wire is decreased without changing the length of the wire.
Option c – length of the wire is increased by 20 cm without changing the current.
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