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
(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
(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
(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 :
(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
(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
(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
(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
(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
(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
(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?
(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
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