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Electricity And Magnetism MCQ Practice Bits. We covered all the Electricity And Magnetism MCQ Practice Bits in this post.
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Electricity And Magnetism MCQ Practice Bits for Students
Quick Quiz
The unit used to measure magnetic flux is
(a) dyne
(b) oersted
(c) gauss
(d) weber
Option d – weber
When does a conductor carrying current experience no magnetic force?
(a) When it is parallel to the magnetic field
(b) When it is perpendicular to the magnetic field
(c) When placed within a magnetic field
(d) When positioned outside the magnetic field
Option a – When it is parallel to the magnetic field
The discovery that a current-carrying wire generates a magnetic field was made by
(a) Oersted
(b) Faraday
(c) Maxwell
(d) Coulomb
Option a – Oersted
What is the shape of magnetic field lines inside a current-carrying solenoid?
(a) Straight
(b) Circular
(c) Parabolic
(d) Curved
Option a – Straight
Who is credited with inventing the electric generator?
(a) Coulomb
(b) Rutherford
(c) Oersted
(d) Michael Faraday
Option d – Michael Faraday
The working principle of an AC generator is based on
(a) The heating effect of electric current
(b) The magnetic effect of electric current
(c) Electromagnetic induction
(d) The sound effect of electric current
Option c – Electromagnetic induction
Which device is responsible for producing electric current?
(a) Generator
(b) Ammeter
(c) Galvanometer
(d) Voltmeter
Option a – Generator
Moving a charge from point A to point B involves work. What is this work per unit charge called?
(a) Potential at point A
(b) Potential at point B
(c) Potential difference between A and B
(d) Current flowing from A to B
Option c – Potential difference between A and B
One joule per coulomb is equivalent to
(a) Watt
(b) Volt
(c) Ampere
(d) Ohm
Option b – Volt
The current flowing through a wire depends on
(a) Only the applied potential difference
(b) Only the resistance of the wire
(c) Both the potential difference and resistance
(d) Neither of the above
Option c – Both the potential difference and resistance
Which device changes electrical energy into mechanical energy?
(a) Motor
(b) Battery
(c) Generator
(d) Switch
Option a – Motor
Which device changes mechanical energy into electrical energy?
(a) Motor
(b) Battery
(c) Generator
(d) Switch
Option c – Generator
What is the magnetic force on a current-carrying wire placed perpendicularly in a uniform magnetic field?
(a) 0
(b) ILB
(c) 2ILB
(d) ILB/2
Option b – ILB
One Tesla is equivalent to
(a) Newton per coulomb
(b) Newton per ampere-meter
(c) Ampere per meter
(d) Newton per ampere-second
Option b – Newton per ampere-meter
When a short circuit happens, the electric current in the circuit
(a) Drops to zero
(b) Stays the same
(c) Increases sharply
(d) Varies unpredictably
Option c – Increases sharply
Electrical cables for appliances like irons and heaters typically have three color-coded wires. Which is the correct wiring code?
(a) Red – live, Green – neutral, Black – ground
(b) Red – neutral, Green – ground, Black – live
(c) Red – live, Green – ground, Black – neutral
(d) Red – ground, Green – live, Black – neutral
Option c – Red – live, Green – ground, Black – neutral
What is the power rating of a device if a 0.3 A current flows through it under 240 V?
(a) 800 W
(b) 36 W
(c) 400 W
(d) 72 W
Option d – 72 W
A fuse rated at 5A is connected in a circuit. What is the maximum number of 100 W – 220 V bulbs that can be safely connected in parallel?
(a) 20 bulbs
(b) 15 bulbs
(c) 11 bulbs
(d) 10 bulbs
Option c – 11 bulbs
Which device converts alternating current to direct current?
(a) Ammeter
(b) Galvanometer
(c) Rectifier
(d) Transformer
Option c – Rectifier
Which of the following are necessary to prevent overloading in home circuits?
(a) Install a fuse in the circuit
(b) Avoid connecting too many appliances to one circuit
(c) Do not use faulty appliances
(d) All of the above
Option d – All of the above
The torque on a rectangular coil in a uniform magnetic field increases when
(a) The number of turns is higher
(b) The number of turns is lower
(c) The coil’s plane is perpendicular to the magnetic field
(d) The coil’s area is smaller
Option a – The number of turns is higher
Fleming’s Left-Hand Rule is related to
(a) The effect of an electric field on current
(b) The effect of a magnetic field on a magnet
(c) The effect of an electric field on a magnet
(d) The effect of a magnetic field on current
Option d – The effect of a magnetic field on current
In Fleming’s Left-Hand Rule, which finger shows the current direction?
(a) Index finger
(b) Middle finger
(c) Thumb
(d) Ring finger
Option a – Index finger
When two long, current-carrying wires run parallel with currents in the same direction, they
(a) Attract each other
(b) Repel each other
(c) Experience no force
(d) Only experience force when the current is switched on or off
Option a – Attract each other
When heating water using a coil, which factors affect the temperature rise?
(a) Supply voltage, current, and heating time
(b) Only supply voltage and current
(c) Only supply voltage
(d) Only current and heating time
Option a – Supply voltage, current, and heating time
What does a kilowatt-hour (kWh) measure?
(a) Electrical power
(b) Force
(c) Momentum
(d) Energy
Option d – Energy
The energy provided by a source in time t when a current I flows through a resistor with voltage V is
(a) VIt²
(b) VI
(c) VIt
(d) V I/t
Option c – VIt
How much energy is used when a 100 W bulb runs for 10 hours per day over 30 days?
(a) 1 unit
(b) 10 units
(c) 30 units
(d) 300 units
Option c – 30 units
What material is commonly used in electric heaters?
(a) Tungsten
(b) Nichrome
(c) Brass
(d) Steel
Option b – Nichrome
What is the name of the heating coil in electric room heaters and cooking devices?
(a) Circuit
(b) Element
(c) Filament
(d) Cells
Option b – Element
A positively charged particle moves west and is deflected north by a magnetic field. What is the magnetic field’s direction?
(a) South
(b) East
(c) Downward
(d) Upward
Option d – Upward
Fluorescent tubes typically contain which type of gas?
(a) Argon gas
(b) Mercury vapor
(c) Sodium vapor
(d) Neon gas
Option b – Mercury vapor
What does CFL stand for?
(a) Compact Fluorescent Lamp
(b) Centrally Fixed Lamp
(c) Chemical Fluorescent Lamp
(d) Condensed Fluorescent Lamp
Option a – Compact Fluorescent Lamp
What is the difference between a CFL and an LED lamp?
I. CFLs use mercury vapor and phosphor to emit light, while LEDs use semiconductor materials.
II. The average lifespan of a CFL is longer than that of an LED.
III. CFLs are less energy-efficient than LEDs.
(a) Only I
(b) II and III
(c) I and III
(d) I, II and III
Option a – Only I
Assertion: Electrical devices with metal bodies typically have three-pin plugs, while a light bulb usually has a two-pin plug.
Reason: Three-pin plugs prevent overheating in the connecting wires.
(a) Both the assertion and reason are true, and the reason explains the assertion
(b) Both the assertion and reason are true, but the reason does not explain the assertion
(c) The assertion is true, but the reason is false
(d) The assertion is false, but the reason is true
Option c – The assertion is true, but the reason is false
Faraday’s Law of electrolysis is linked to:
(a) The atomic number of positive ions
(b) The equivalent weight in electrolysis
(c) The atomic number of negative ions
(d) The velocity of positive ions
Option c – The atomic number of negative ions
What is the unit used to measure magnetic fields?
(a) Cobalt
(b) Ohm
(c) Tesla
(d) Ampere
Option c – Tesla
What happens to the magnetic field inside a solenoid from one end to the other? ( Electricity And Magnetism MCQ )
(a) It increases
(b) It decreases
(c) It stays the same
(d) It increases and then decreases
Option c – It stays the same
Which property of a proton remains unchanged while it moves freely through a magnetic field? ( Electricity And Magnetism MCQ )
(a) Speed
(b) Velocity
(c) Momentum
(d) Both speed and velocity
Option a – Speed
An industrial refrigerator consumes 5 kW of power, working 10 hours daily for 30 days. If electricity costs ₹4 per kWh, what will be the energy cost?
(a) ₹600
(b) ₹6000
(c) ₹1200
(d) ₹1500
Option d – ₹1500
What is the net force on a bar magnet placed in a uniform magnetic field?
(a) Zero
(b) Depends on the magnet’s length
(c) Always non-zero
(d) Depends on temperature
Option a – Zero
Which statement about magnetic field lines is incorrect?
(a) They can start from a point
(b) They never cross each other
(c) They are not perfectly straight at the poles’ ends
(d) There are no magnetic field lines inside a bar magnet
Option d – There are no magnetic field lines inside a bar magnet
A fuse rated at 5A is connected in a circuit. What is the highest number of 100 W – 220 V bulbs that can be safely connected in parallel?
(a) 20
(b) 15
(c) 11
(d) 10
Option c – 11
A cooler rated at 1500 W and a fan rated at 500 W, both operating at 200 V, are used together. What fuse rating is required? ( Electricity And Magnetism MCQ )
(a) 2.5 A
(b) 5.0 A
(c) 7.5 A
(d) 10 A
Option d – 10 A
A cylindrical conductor with length l and cross-sectional area A has resistance R. Another conductor of the same material and resistance R but length 2l will have what cross-sectional area?
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A
Option c – 2A
How can an AC generator be modified to function as a DC generator? ( Electricity And Magnetism MCQ )
(a) Use a split-ring commutator
(b) Use slip rings and brushes
(c) Apply a stronger magnetic field
(d) Use a rectangular wire loop
Option a – Use a split-ring commutator
If the current through a resistor doubles while temperature remains constant, how much does the power increase?
(a) 100%
(b) 200%
(c) 300%
(d) 400%
Option c – 300%
An electric bulb connected to a 220 V generator draws a current of 0.50 A. What is the bulb’s power?
(a) 440 W
(b) 110 W
(c) 55 W
(d) 0.0023 W
Option b – 110 W
Which statement is incorrect regarding the magnetic field of a solenoid? ( Electricity And Magnetism MCQ )
(a) Magnetic field lines inside the solenoid are straight, indicating uniform strength.
(b) The strong magnetic field can magnetize soft iron placed inside the solenoid.
(c) The magnetic field pattern around a solenoid differs from that around a bar magnet.
(d) Reversing current direction reverses the N and S poles of the solenoid.
Option c – The magnetic field pattern around a solenoid differs from that around a bar magnet.
Which of the following is not used in commercial electric motors?
(a) An electromagnet to rotate the armature
(b) Many turns of conducting wire in the coil
(c) A permanent magnet to rotate the armature
(d) A soft iron core for winding the coil
Option c – A permanent magnet to rotate the armature
The magnetic field strength inside a long, straight solenoid is:
(a) Stronger at the ends than the center
(b) Weakest at the middle
(c) Uniform at all points
(d) Increases from one end to the other
Option c – Uniform at all points
In a solenoid carrying current I with n turns per unit length, the magnetic field inside is B. If the number of turns doubles to 2n, what happens to the magnetic field? ( Electricity And Magnetism MCQ )
(a) Remains B
(b) Becomes 2B
(c) Reduces to B/2
(d) Reduces to B/4
Option b – Becomes 2B
Which statement accurately describes electrical insulators?
(a) They have no electrons
(b) Electrons cannot easily move through them
(c) They are crystalline
(d) They have more electrons than protons on their surfaces
Option b – Electrons cannot easily move through them
Choose the incorrect statement.
(a) Bulbs glow due to the heating effect of current
(b) Food cans are coated with tin via electroplating
(c) Connecting cells in series adds up their voltages
(d) None of these
Option d – None of these
Why is a compass needle pivoted on a sharp pin?
(a) To minimize magnetic influence on the pin
(b) To maximize magnetic influence on the pin
(c) To reduce friction between the pin and needle
(d) To prevent the needle from falling off
Option c – To reduce friction between the pin and needle
Consider the following:
- The magnetic pole in the northern hemisphere is a north magnetic pole.
- A magnet attracts an iron bar at all points.
Which statement is correct?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option d – Neither 1 nor 2
Which statements are correct about heat generation in a conductor? ( Electricity And Magnetism MCQ )
- Heat is independent of the current through the conductor.
- Heat depends on the material’s thermal conductivity.
- Heat depends on the material’s specific resistance.
(a) 1 and 3
(b) Only 2
(c) 1 and 2
(d) 2 and 3
Option d – 2 and 3
Consider these statements:
- Breaking a bar magnet into two equal parts does not eliminate its magnetism.
- Magnetic properties originate at the atomic level.
Which statements are correct?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option c – Both 1 and 2
A conductor carrying 1 A of current generates 2000 J of heat. If the current is doubled, how much heat will be produced?
(a) 2000 J
(b) 4000 J
(c) 8000 J
(d) 1000 J
Option c – 8000 J
When two parallel wires carry DC current in the same direction, they will:
(a) Attract each other
(b) Repel each other
(c) Experience no force
(d) Only experience force when the current is switched on or off
Option a – Attract each other
Three resistors in series total 90 ohms. What is their equivalent resistance when connected in parallel? ( Electricity And Magnetism MCQ )
(a) 10 ohms
(b) 30 ohms
(c) 270 ohms
(d) 810 ohms
Option a – 10 ohms
Which device converts low-voltage AC to high-voltage AC and vice versa?
(a) Generator
(b) Motor
(c) Transformer
(d) Vibrator
Option c – Transformer
Which sequence correctly shows power consumption for lights of equal brightness?
(a) CFL < Fluorescent tube < Incandescent bulb < LED
(b) LED < CFL < Fluorescent tube < Incandescent bulb
(c) CFL < Fluorescent tube < LED < Incandescent bulb
(d) Incandescent bulb < LED < Fluorescent tube < CFL
Option b – LED < CFL < Fluorescent tube < Incandescent bulb
A coil connected to a galvanometer forms a loop. When a magnet is: ( Electricity And Magnetism MCQ )
A: Held stationary
B: Moved away along its axis
C: Moved towards along its axis
Current will be induced 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
Which of the following statements is incorrect?
(a) The magnetic field pattern around a conductor depends on its shape
(b) The magnetic field around a solenoid is like that of a bar magnet
(c) Magnetic field strength increases with current
(d) Magnetic fields produced by straight wires are permanent
Option d – Magnetic fields produced by straight wires are permanent
In a wire of varying cross-section, which remains constant?
(a) The amount of charge passing through in a given time
(b) Drift velocity
(c) Current density
(d) Free-electron density
Option a – The amount of charge passing through in a given time
What causes lightning?
(a) Similar electric charges attract each other and then repel
(b) Clouds strike air impurities causing friction and burning
(c) Strong opposite charges in clouds overcome air resistance
(d) Water vapor generates electricity in clouds
Option c – Strong opposite charges in clouds overcome air resistance
Which household safety device prevents fires caused by short circuits? ( Electricity And Magnetism MCQ )
(a) Insulated wire
(b) Plastic switches
(c) Non-metallic wire coatings
(d) Electric fuse
Option d – Electric fuse
Three resistors each with resistance r have a parallel equivalent resistance of x. What is their total resistance when connected in series?
(a) 3x
(b) 3rx
(c) 9x
(d) 3/x
Option c – 9x
A simple circuit has a 12 V battery and a bulb with a 24-ohm resistance. What current will the ammeter show?
(a) 0.5 A
(b) 2 A
(c) 4 A
(d) 5 A
Option a – 0.5 A
Three resistors of 2, 4, and 8 ohms are connected in parallel. What is the total resistance? ( Electricity And Magnetism MCQ )
(a) Less than 2 ohms
(b) More than 2 ohms but less than 4 ohms
(c) 4 ohms
(d) 14 ohms
Option a – Less than 2 ohms
Which statement is true about bar magnets?
(a) The north pole of a bar magnet is stronger than the south pole
(b) Splitting a bar magnet separates the north and south poles
(c) Cutting a bar magnet in half creates two new magnets
(d) The poles of a bar magnet are unequal but opposite
Option c – Cutting a bar magnet in half creates two new magnets
Which device operates on mutual induction? ( Electricity And Magnetism MCQ )
(a) Tubelight
(b) Transformer
(c) Photodiode
(d) LED
Option b – Transformer
Why does a spark appear when unplugging an electrical device?
(a) Resistance
(b) Inductance
(c) Capacitance
(d) Wattage
Option a – Resistance
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