Electromagnetism MCQs

Question: Which law describes the force between two electric charges?

A) Faraday’s Law
B) Ampere’s Law
C) Coulomb’s Law
D) Ohm’s Law
Answer: C) Coulomb’s Law
Question: The SI unit of electric charge is:

A) Volt (V)
B) Coulomb (C)
C) Ampere (A)
D) Ohm (Ω)
Answer: B) Coulomb (C)
Question: Electric current is defined as the flow of:

A) Protons
B) Neutrons
C) Electrons
D) Positrons
Answer: C) Electrons
Question: What is the direction of the electric field due to a positive point charge?

A) Away from the charge
B) Towards the charge
C) Parallel to the charge
D) Perpendicular to the charge
Answer: A) Away from the charge
Question: Which of the following materials is a good conductor of electricity?

A) Rubber
B) Glass
C) Copper
D) Plastic
Answer: C) Copper
Question: An electric circuit with only one path for current flow is called:

A) Series circuit
B) Parallel circuit
C) Open circuit
D) Closed circuit
Answer: D) Closed circuit
Question: The phenomenon of electromagnetic induction is associated with which law?

A) Gauss’s Law
B) Ampere’s Law
C) Ohm’s Law
D) Faraday’s Law
Answer: D) Faraday’s Law
Question: The process of producing an electric current by changing the magnetic field is known as:

A) Electromagnetic induction
B) Capacitance
C) Resistance
D) Conductance
Answer: A) Electromagnetic induction
Question: What happens to the resistance of a conductor if its length is doubled while keeping its cross-sectional area constant?

A) It doubles
B) It quadruples
C) It halves
D) It remains the same
Answer: A) It doubles
Question: Which law states that the induced electromotive force (emf) in a circuit is equal to the rate of change of magnetic flux through the circuit?

A) Lenz’s Law
B) Faraday’s Law
C) Coulomb’s Law
D) Ampere’s Law
Answer: B) Faraday’s Law
Question: The unit of magnetic field intensity (B) in the SI system is:

A) Weber (Wb)
B) Tesla (T)
C) Henry (H)
D) Gauss (G)
Answer: B) Tesla (T)
Question: A current-carrying wire produces a magnetic field around it. This statement is described by:

A) Lenz’s Law
B) Faraday’s Law
C) Ampere’s Law
D) Biot-Savart Law
Answer: D) Biot-Savart Law
Question: What is the SI unit of electric potential difference (voltage)?

A) Joule (J)
B) Watt (W)
C) Volt (V)
D) Ohm (Ω)
Answer: C) Volt (V)
Question: Which of the following is not a property of a magnetic field?

A) It can exert forces on magnetic materials
B) It is a scalar quantity
C) It can induce electric currents
D) It can be produced by moving charges
Answer: B) It is a scalar quantity
Question: What happens to the resistance of a conductor if its cross-sectional area is doubled while keeping its length constant?

A) It doubles
B) It quadruples
C) It halves
D) It reduces by one-fourth
Answer: D) It reduces by one-fourth
Question: Which of the following is a device used to store electric charge?

A) Resistor
B) Capacitor
C) Inductor
D) Transformer
Answer: B) Capacitor
Question: What does an ammeter measure?

A) Voltage
B) Current
C) Resistance
D) Capacitance
Answer: B) Current
Question: Which of the following is not a method to induce an electric current in a circuit?

A) Moving a magnet near a coil
B) Changing the resistance of the circuit
C) Rotating a coil in a magnetic field
D) Changing the area of a coil in a magnetic field
Answer: B) Changing the resistance of the circuit
Question: The direction of induced current in a conductor moving in a magnetic field is governed by:

A) Ohm’s Law
B) Ampere’s Law
C) Lenz’s Law
D) Coulomb’s Law
Answer: C) Lenz’s Law
Question: The phenomenon where a material retains its magnetism after the applied magnetic field is removed is called:

A) Paramagnetism
B) Ferromagnetism
C) Diamagnetism
D) Electromagnetism
Answer: B) Ferromagnetism
Question: What type of current flows only in one direction?

A) DC (Direct Current)
B) AC (Alternating Current)
C) Both DC and AC
D) None of the above
Answer: A) DC (Direct Current)
Question: Which of the following materials is a good insulator?

A) Copper
B) Aluminum
C) Glass
D) Silver
Answer: C) Glass
Question: Which law relates the magnetic field around a closed loop to the electric current passing through the loop?

A) Gauss’s Law for Magnetism
B) Biot-Savart Law
C) Ampere’s Law
D) Faraday’s Law
Answer: C) Ampere’s Law
Question: The rate of doing work in an electric circuit is measured in:

A) Watts (W)
B) Joules (J)
C) Coulombs (C)
D) Volts (V)
Answer: A) Watts (W)
Question: The property of an electric circuit that opposes the flow of current is known as:

A) Conductance
B) Impedance
C) Resistance
D) Inductance
Answer: C) Resistance
Question: What does a galvanometer measure?

A) Voltage
B) Current
C) Resistance
D) Capacitance
Answer: B) Current
Question: Which law describes the magnetic field produced by a steady electric current?

A) Faraday’s Law
B) Ampere’s Law
C) Lenz’s Law
D) Ohm’s Law
Answer: B) Ampere’s Law
Question: What is the term for the opposition to the change in current flow in an inductor?

A) Capacitance
B) Impedance
C) Inductance
D) Reactance
Answer: D) Reactance
Question: In which material does current flow with almost zero resistance at very low temperatures?

A) Copper
B) Aluminum
C) Superconductor
D) Nichrome
Answer: C) Superconductor
Question: What is the unit of magnetic flux density?

A) Tesla (T)
B) Weber (Wb)
C) Henry (H)
D) Gauss (G)
Answer: A) Tesla (T)
Question: What type of electromagnetic radiation has the longest wavelength?

A) X-rays
B) Ultraviolet
C) Infrared
D) Radio waves
Answer: D) Radio waves
Question: Which device is used to change the voltage of alternating current?

A) Capacitor
B) Transformer
C) Diode
D) Inductor
Answer: B) Transformer
Question: What is the SI unit of magnetic flux?

A) Ohm (Ω)
B) Weber (Wb)
C) Tesla (T)
D) Volt (V)
Answer: B) Weber (Wb)
Question: Which electromagnetic wave has the shortest wavelength?

A) Gamma rays
B) X-rays
C) Ultraviolet
D) Visible light
Answer: A) Gamma rays
Question: Which of the following is not a type of electromagnetic radiation?

A) Microwaves
B) Sound waves
C) Gamma rays
D) Radio waves
Answer: B) Sound waves
Question: What is the effect of placing a conductor near a changing magnetic field?

A) Induced electric field
B) Induced magnetic field
C) Induced electric current
D) Induced charge
Answer: C) Induced electric current
Question: Which law describes the relationship between the voltage across a conductor, the current through it, and its resistance?

A) Faraday’s Law
B) Ampere’s Law
C) Ohm’s Law
D) Lenz’s Law
Answer: C) Ohm’s Law
Question: What is the phenomenon where a magnetic material becomes a magnet when placed in a magnetic field?

A) Ferromagnetism
B) Diamagnetism
C) Paramagnetism
D) Electromagnetism
Answer: A) Ferromagnetism
Question: Which of the following is a measure of the opposition to the flow of alternating current in a circuit?

A) Capacitance
B) Impedance
C) Resistance
D) Inductance
Answer: B) Impedance
Question: In an AC circuit, the direction of current changes:

A) Periodically
B) Irregularly
C) Never
D) In one direction only
Answer: A) Periodically
Question: Which of the following is not a type of magnet?

A) Permanent magnet
B) Electromagnet
C) Supermagnet
D) Temporary magnet
Answer: C) Supermagnet
Question: What is the purpose of a rectifier in an electrical circuit?

A) To regulate voltage
B) To store charge
C) To convert AC to DC
D) To amplify current
Answer: C) To convert AC to DC
Question: What does an oscilloscope measure?

A) Voltage
B) Current
C) Frequency
D) Waveform
Answer: D) Waveform
Question: Which law describes the relationship between the magnetic field induced around a closed loop and the rate of change of electric flux through the loop?

A) Gauss’s Law for Magnetism
B) Biot-Savart Law
C) Ampere’s Law
D) Faraday’s Law
Answer: D) Faraday’s Law
Question: Which material loses its ferromagnetic properties when the external magnetic field is removed?

A) Paramagnetic material
B) Ferromagnetic material
C) Diamagnetic material
D) Superconductor
Answer: A) Paramagnetic material
Question: What type of current flows back and forth along a conductor?

A) DC (Direct Current)
B) AC (Alternating Current)
C) Both DC and AC
D) None of the above
Answer: B) AC (Alternating Current)
Question: Which law states that the magnetic field lines form closed loops with no beginning or end?

A) Gauss’s Law for Magnetism
B) Biot-Savart Law
C) Ampere’s Law
D) Lenz’s Law
Answer: A) Gauss’s Law for Magnetism
Question: Which of the following does not affect the resistance of a conductor?

A) Length of the conductor
B) Cross-sectional area of the conductor
C) Temperature of the conductor
D) Voltage applied across the conductor
Answer: D) Voltage applied across the conductor
Question: What does a capacitor store?

A) Electric charge
B) Magnetic field
C) Voltage
D) Current
Answer: A) Electric charge
Question: Which of the following is not an application of electromagnetism?

A) Electric motors
B) MRI machines
C) Radio communication
D) Wind turbines
Answer: D) Wind turbines

Electromagnetism MCQs

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