Electricity MCQ Questions. We covered all the Electricity MCQ Questions in this post for free so that you can practice well for the exam.
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MCQ on Electricity for Students
Regarding a transformer which of the following is incorrect?
(a) The principle is induction
(b) Varying potential is required
(c) Energy is produced or lost
(d) Performs based on the number of turns
Option c – Energy is produced or lost
At every point of a current-carrying circular loop, the concentric circles representing the magnetic fields around it would become ( Electricity MCQ Questions )
(a) larger and larger as we move away from the wire
(b) so large at the center of the circular loop that they look like straight lines
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
In order to find the direction of induced current one uses
(a) Fleming’s left-hand rule
(b) Fleming’s right-hand rule
(c) Right-hand thumb rule
(d) Screw rule
Option b – Fleming’s right-hand rule
MRI stands for ( Electricity MCQ Questions )
(a) Magnets Resonant Imaging
(b) Magnetic Resonance Imaging
(c) Magnetic Radar Imaging
(d) Magnets Radial Imagic
Option b – Magnetic Resonance Imaging
Which of the following instruments is used to measure magnetic field?
(a) Thermometer
(b) Pyrometer
(c) Hygrometer
(d) Flux meter
Option d – Flux meter
A straight conducting wire is placed parallel to and over a compass needle. The deflection in the needle ( Electricity MCQ Questions )
(a) becomes opposite when the direction of the current is reversed
(b) remains in the same direction even on reversing the direction of current
(c) keeps fluctuating on the passage of current in any direction
(d) Is negligible in reversing the direction of current
Option a – becomes opposite when the direction of the current is reversed
An electromagnet consists of a core of …….. wrapped around with a coil of ………. copper wire.
(a) soft iron, insulated
(b) aluminum, insulated
(c) soft iron, uncovered
(d) magnet, uncovered
Option a – soft iron, insulated
Two bars of soft iron exactly alike are given. One of them is a magnet. Without using anything more, how would you find which is a magnet : ( Electricity MCQ Questions )
(a) By bringing two bars near and noting which one is attractive. The attractive one is a magnet.
(b) By bringing two bars near and noting which one is repelling. One which repels is an ordinary iron.
(c) By rubbing one bar with the other and noting which becomes a magnet. The bar which is magnetized is an ordinary iron.
(d) One bar is placed flat horizontally on the table and the other bar is held vertically with one end in the middle of the first bar. If there is an attraction between the two, the vertical bar is a magnet otherwise ordinary iron.
Option d – One bar is placed flat horizontally on the table and the other bar is held vertically with one end in the middle of the first bar. If there is an attraction between the two, the vertical bar is a magnet otherwise ordinary iron
In domestic circuits, wires with red insulations are used as live wires, whereas
(a) the wires with black insulations are used as neutral (or negative) wires
(b) the wires with green insulations or steel wires are used as earth wires
(c) the wires with black insulations are used for positive terminals
(d) Only (a) and (b)
Option d – Only (a) and (b)
The parameters of electricity supply in India are ( Electricity MCQ Questions )
(a) Potential Difference of 220 V, Frequency of 50 hertz, and Current Rating of 5A/15A
(b) Potential Difference of 150 V, Frequency of 40 hertz, and Current Rating of 10 A
(c) Potential Difference of 220 V, Frequency of 60 hertz, and Current Rating of 15A
(d) Potential Difference of 220 V, Frequency of 40 hertz, and Current Rating of 5 A
Option a – Potential Difference of 220 V, Frequency of 50 hertz, and Current Rating of 5A/15A
(a) A rectangular coil of insulated copper wire is placed between the two poles of a magnetic field such that two of its parallel sides are perpendicular to the direction of the magnetic field.
(b) The ends of the coil are connected to the two halves of a split ring.
(c) The inner insulated sides are attached to the axle whereas the external conducting edges touch two conducting stationary bushes.
(d) The coil and the axle continuously rotate in one direction.
Option d – The coil and the axle continuously rotate in one direction
Magnetic field lines caused by a solenoid ( Electricity MCQ Questions )
(a) are curves
(b) start at the north and end at the south
(c) closed loops
(d) uniform everywhere
Option c – closed loops
A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is A: held stationary B: moved away along its axis C: moved towards along its axis There will be induced current in
(a) A only
(b) A and B only
(c) B and C only
(d) A, B, and C
Option c – B and C only
A horizontal power line carries current from east to west. The direction of the magnetic field at a point below the wire is directed ( Electricity MCQ Questions )
(a) upward
(b) downward
(c) towards the north
(d) toward south
Option d – toward south
The region surrounding a magnet, in which the force of the magnet can be detected is said to have the
(a) magnetic field
(b) electric field
(c) magnetic poles
(d) None of these
Option a – magnetic field
A coil of rectangular dimensions is rotated in a magnetic field. The flux-associated, changes due to the change in ( Electricity MCQ Questions )
(a) number (N)
(b) area (A)
(c) strength of field (B)
(d) the angle between B and A
Option d – the angle between B and A
A conductor of length / carrying a current I placed in a perpendicular magnetic field experiences 5 N of force. If the length is doubled with a halved magnetic field. The force experienced with doubled current is
(a) 5N
(b) 10N
(c) 15N
(d) 2.5 N
Option b – 10N
A moving charge experiences a maximum force when the angle between its velocity and the magnetic field is ( Electricity MCQ Questions )
(a) 0°
(b) 30°
(c) 60°
(d) 90°
Option d – 90°
Alloys are usually used in electrical heating devices because
(a) the resistivity of an alloy is generally higher than that of constituent elements
(b) alloys do not oxidize readily at high temperatures
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
An electric motor is a device ( Electricity MCQ Questions )
(a) that works on the principle described by Fleming’s left-hand rule
(b) that converts electrical energy to mechanical energy
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
An increase in the number of turns of a coil in the solenoid will
(a) have no effect on the strength of the magnetic field
(b) will add to the strength of the magnetic field
(c) will decrease the strength of the magnetic field
(d) will change the direction of the magnetic field
Option b – will add to the strength of the magnetic field
Which of the following statements is not true? ( Electricity MCQ Questions )
(a) The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor
(b) The magnetic field of a solenoid carrying a current is similar to that of a bar magnet
(c) Magnitude of the magnetic field is directly proportional to the quantity of current flowing through the current
(d) Magnetic field produced by the passage of current through a straight wire is permanent
Option d – Magnetic field produced by the passage of current through a straight wire is permanent
The direction of magnetic lines of force of a bar magnet is ( Electricity MCQ Questions )
(a) from the south to the north pole
(b) from the north to the south pole
(c) across the bar magnet
(d) from south to north pole inside the magnet and from north to south pole outside the magnet
Option d – from south to north pole inside the magnet and from north to south pole outside the magnet
The lines of force due to the earth’s horizontal magnetic field are ( Electricity MCQ Questions )
(a) parallel and straight
(b) concentric circles
(c) elliptical
(d) curved lines
Option b – concentric circles
In a voltmeter, to measure the potential difference, we connect it with the segment in
(A) Series
(B) Parallel
(C) Either ‘A’ or ‘B’
(D) Neither ‘A’ nor ‘B’
Option b – Parallel
To increase the range of the voltmeter the series resistance should be : ( Electricity MCQ Questions )
(A) Increased
(B) Decreased
(C) Unchanged
(D) Zero
Option a – Increased
A voltmeter always gives a lower value of potential difference because
(A) Some energy is gained in moving the needle
(B) It takes current for its own deflection
(C) It absorbs some energy
(D) It can not be predicted
Option b – It takes current for its own deflection
By mistake, a voltmeter is connected in series and an ammeter is connected in parallel with resistance in a circuit. What will happen to the instrument? : ( Electricity MCQ Questions )
(A) Voltmeter will damage
(B) Ammeter will be damaged
(C) Both meters were damaged
(D) No one will be damaged
Option b – Ammeter will be damaged
A voltmeter of resistance 2000Ω reads 1 volt/div. It is made to read 10 volts/div. We should connect a resistance :
(A) 18 Ω in series
(B) 1800 Ω in parallel
(C) 1800 Ω in series
(D) 18000 Ω in series
Option d – 18000 Ω in series
A galvanometer gives full-scale deflection when the current passed through it is 1 mA. Its resistance is 100 22 without connecting additional resistance in series with it, it can be used as a voltmeter of range : ( Electricity MCQ Questions )
(A) 1.000 V
(B) 0.100 V
(C) 0.010 V
(D) 0.001 V
Option b – 0.100 V
In the given figure, an ammeter reads 5 A and a voltmeter reads 40 V. The actual value of resistance R is :
(A) 8 Ω
(B) Greater than 8 Ω
(C) Less than 8Ω
(D) 200 Ω
Option b – Greater than 8 Ω
A voltmeter has a range of 0 to V volt, with a series resistance R. With a series resistance 2R, its range is 0 to V then the relation between V and V’ is :
(A) V’ <2V
(B) V’ > 2V
(C) V’ = 2V
(D) V’ = V
Option a – V’
The resistance of an ammeter is 100 Ω. A current of 1 mA can be passed through it. The required series resistance in ohm, so that it can measure 20 volts is :
(A) 19900 Ω
(Β) 190 Ω
(C) 1900 Ω
(D) 19 Ω
Option a – 19900 Ω
The resistance of a voltmeter is 2000 Ω and it can to 2 V. The resistance in ohm joined measure up in series, so that it can measure 10 V is :
(A) 8000
(B) 10000
(C) 7000
(D) 2000
Option a – 8000
A voltmeter can measure up to 25V and its resistance is 1000 Ω. How much resistance should be connected in series so that it can measure voltage up to 250 volts?
(A) 90 Ω
(B) 900 Ω
(C) 9000 Ω
(D) 90000 Ω
Option c – 9000 Ω
A galvanometer of resistance (G) 10 Ω and a series resistance (R) 250 Ω is used to convert it into a voltmeter of 2 V reading. The current passing through the voltmeter is near:
(A) 0.0077 mA
(B) 0.077 mA
(C) 0.77 mA
(D) 7.7 mA
Option d – 7.7 mA
Which of the following is likely to have larger resistance? :
(A) Ammeter of range 1A
(B) Voltmeter of range 10 V
(C) Moving coil galvanometer
(D) All will have the same resistance
Option b – Voltmeter of range 10 V
The net resistance of a voltmeter should be large to ensure that it may :
(A) Not get overheated
(B) Measure the large potential difference
(C) Not draw excessive current
(D) Not change the value of the potential difference
Option d – Not change the value of the potential difference
Which of the following has the largest resistance?
(A) Ammeter
(B) Milliammeter
(C) Microammeter
(D) Galvanometer
Option d – Galvanometer
The resistance of an ideal voltmeter is :
(A) Zero
(B) Less than zero
(C) Greater than zero
(D) Infinite
Option d – Infinite
Which of the following has maximum resistance :
(A) Voltmeter
(B) Millivoltmeter
(C) Microvoltmeter
(D) Galvanometer
Option a – Voltmeter
A conducting wire is dropped along the East-West direction, then
(a) no emf is induced.
(b) no induced current flows.
(c) induced current flows from West to East.
(d) induced current flows from East to West.
Option c – induced current flows from West to East
The self-inductance of a Solenoid is
(a) directly proportional to the current flowing through the coil.
(b) directly proportional to its length.
(c) directly proportional to the area of the cross-section.
(d) inversely proportional to the area of the cross-section.
Option c – directly proportional to the area of the cross-section
Mutual inductance of a few coils can be increased by
(a) decreasing the number of turns in the coil.
(b) increasing the number of turns in the coils.
(c) winding the coils on a wooden core.
(d) None of the above
Option b – increasing the number of turns in the coils
Assertion (A) Eddy current is produced in any metallic conductor when the magnetic flux is changed around it. Reason (R) Electric potential determines the flow of charge. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option b – Both A and R are true, but R is not the correct explanation of A
In an electrical motor
(a) heat is converted into electrical energy.
(b) electrical energy is converted into heat.
(c) electrical energy is converted into mechanical energy.
(d) mechanical energy is converted into electrical energy.
Option c – electrical energy is converted into mechanical energy
Alternating current can not be measured by DC ammeter because
(a) AC cannot pass through a DC ammeter.
(b) the average value of the complete cycle is zero.
(c) AC is virtual.
(d) AC changes its direction.
Option b – the average value of the complete cycle is zero
The ‘Choke’ used with a tube light is basically
(a) an inductor
(b) a capacitor
(c) a transformer
(d) a resistor
Option a – an inductor
Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). Assertion (A) Transformer is useful for stepping up or stepping down voltages. Reason (R) Transformer is a device used in DC circuits. In the context of the above two statements, which one of the following is correct? Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option c – A is true, but R is false
Which of the following is the purpose for which a transformer is used?
(a) To convert AC into DC
(b) To convert DC into AC
(c) To step-up or step-down AC voltage
(d) To step-up DC voltage
Option c – To step-up or step-down AC voltage
In a step-down transformer, the AC output gives the
(a) current more than the input current.
(b) current less than the input current.
(c) current equal to the input current.
(d) voltage more than the input voltage.
Option a – current more than the input current
After using it for some time, big transformers get heated up. This is due to the fact that I. current produces heat in the transformers. II. hysteresis loss occurs in the transformers. III. the liquid used for cooling gets heated. Select the correct answer using the codes given below.
(a) Only I
(b) II and III
(c) I and II
(d) I, II, and III
Option c – I and II
A rectangular coil of copper wire is rotating in a magnetic field. The direction of the induced current changes once in each.
(a) Two revolutions
(b) One revolution
(c) Half revolution
(d) One-fourth revolution
Option c – Half revolution
(a) Only I and II
(b) Only I and III
(c) Only I and III
(d) All statements are correct
Option d – All statements are correct
If the speed of a moving magnet inside a coil increases, the electric current in the coil
(a) increases
(b) decreases
(c) reverses
(d) remains the same
Option a – increases
When the direction of motion of the coil is perpendicular to the electromagnetic field, then the value of induced current is ……..
(a) minimum
(b) maximum
(c) neither minimum nor maximum
(d) No option is correct
Option b – maximum
Faraday’s Laws are a consequence of conservative of
(a) energy
(b) energy and magnetic field
(c) charge
(d) magnetic field
Option a – energy
Lenz’s Law is a consequence of the law of conservatives of
(a) charge
(b) momentum
(c) mass
(d) energy
Option d – energy
The device which works on the principle of electromagnetic induction is
(a) an Ammeter
(b) a Voltmeter
(c) a Dynamo
(d) None of these
Option c – a Dynamo
The basic difference between an AC generator and a DC generator is that
(a) an AC generator has an electromagnet while a DC generator has a permanent magnet.
(b) AC generator has slip rings while the DC generator has a commutator.
(c) DC generator will generate a higher voltage.
(d) AC generator will generate a higher voltage.
Option b – AC generator has slip rings while the DC generator has a commutator
The Dynamo core is laminated because
(a) the magnetic field increases.
(b) magnetic saturation level in the core increases.
(c) residual magnetism in the core decreases.
(d) loss of energy in the core due to eddy currents decreases.
Option d – loss of energy in the core due to eddy currents decreases
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice-versa?
(a) Generator
(b) Motor
(c) Transformer
(d) Vibrator
Option c – Transformer
Step-up transformers are used for
(a) increasing electrical power
(b) decreasing electrical power
(c) decreasing voltage
(d) increasing voltage
Option d – increasing voltage
A mobile phone charger is
(a) an inverter
(b) a ups
(c) a step-up transformer
(d) a step-down transformer
Option d – a step-down transformer
The purpose of choke in a fluorescent lamp is
(a) to increase the current flow.
(b) to decrease the current flow.
(c) to decrease the resistance.
(d) to decrease the voltage momentarily.
Option b – to decrease the current flow
A choke coil has
(a) low inductance and high resistance.
(b) low inductance and low resistance.
(c) high inductance and low resistance.
(d) high inductance and high resistance.
Option c – high inductance and low resistance
A generator converts
(a) mechanical energy into electrical energy.
(b) electrical energy into chemical energy.
(c) thermal energy into electrical energy.
(d) electrical energy into light energy.
Option a – mechanical energy into electrical energy
Which of the following statements is incorrect?
(a) An electric motor converts electrical energy into mechanical energy.
(b) An electric generator works on the principle of electromagnetic induction.
(c) The magnetic field at the center of a long circular coil carrying current will be parallel straight lines.
(d) A wire with green insulation is usually the live wire.
Option d – A wire with green insulation is usually the live wire
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