Electricity and Magnetism: Master the Fundamentals with Interactive Quizzes

Question 1

Ohm's Law describes the relationship between current and voltage in a resistor. Which of the following statements is true?

Accepted Answer

Current is directly proportional to voltage.

Answer

Current is inversely proportional to voltage.

Answer

Current is independent of voltage.

Question 2

In an AC circuit with a capacitor, how does the capacitive reactance change as the frequency of the AC supply increases?

Accepted Answer

Decreases

Answer

Increases

Answer

Remains constant

Answer

Changes unpredictably

Question 3

When a bar magnet is moved near a coil of wire, what happens?

Accepted Answer

An electric current is produced in the coil only when the magnet is moving.

Answer

An electric current is produced in the coil even if the magnet is not moving.

Answer

Nothing happens to the coil.

Question 4

Two charged particles A and B are separated by a distance of 2 cm and experience a repulsive force of 1 N. If the charge on particle A is -2 µC, what is the charge on particle B?

Accepted Answer

4 µC

Answer

2 µC

Answer

-4 µC

Answer

-8 µC

Question 5

The SI unit of magnetic flux is:

Accepted Answer

Weber

Answer

Tesla

Answer

Gauss

Answer

Ampere

Question 6

A transformer is primarily used for:

Accepted Answer

Increasing or decreasing voltage

Answer

Converting alternating current to direct current

Answer

Converting direct current to alternating current

Answer

Storing electrical energy

Question 7

The direction of the induced current in a conductor is determined by:

Accepted Answer

Lenz's law

Answer

Faraday's law

Answer

Ohm's law

Answer

Kirchhoff's law

Question 8

A capacitor stores energy primarily in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Gravitational field

Answer

Chemical energy

Question 9

The SI unit of capacitance is:

Accepted Answer

Farad

Answer

Coulomb

Answer

Volt

Answer

Ampere

Question 10

Define an electric field.

Accepted Answer

The region where the influence of a charged particle can be detected

Answer

The force acting on a point charge at a given location

Answer

The potential energy per unit charge at a given location

Answer

The rate of charge flow at a given location

Question 11

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Glass

Question 12

Which of the following is not a type of electromagnetic induction?

Accepted Answer

Electric induction

Answer

Self-induction

Answer

Mutual induction

Answer

Magnetic induction

Question 13

What is the SI unit of electric potential?

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Coulomb

Question 14

A capacitor stores energy primarily in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Gravitational field

Answer

Mechanical energy

Question 15

The magnetic field around a current-carrying wire is:

Accepted Answer

Circular

Answer

Radial

Answer

Uniform

Answer

Non-uniform

Question 16

The power dissipated in a resistor is given by the formula:

Accepted Answer

P = I^2R

Answer

P = VI

Answer

P = V^2/R

Answer

P = V/R

Question 17

Two point charges, one positive (+Q) and the other negative (-Q), are separated by a distance 'd'. What is the electric field strength midway between the charges?

Accepted Answer

Q/4πԑ₀d²

Answer

Zero

Answer

-Q/4πԑ₀d²

Answer

Q/8πԑ₀d²

Question 18

A bar magnet is suspended freely at its center and will align itself with the Earth's magnetic field. Why does this occur?

Accepted Answer

The magnet is attracted to the Earth's magnetic poles.

Answer

The magnet is repelled by the Earth's magnetic field.

Question 19

Identify the material that is a good conductor of electricity.

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Plastic

Question 20

Which law describes the emf induced in a coil when the magnetic flux linked with it changes?

Accepted Answer

Faraday's law

Answer

Lenz's law

Question 21

What is the primary purpose of a transformer?

Accepted Answer

Increase or decrease voltage

Answer

Increase or decrease current

Question 22

Identify the unit of magnetic flux.

Accepted Answer

Weber (Wb)

Answer

Tesla (T)

Question 23

Which unit measures electric potential?

Accepted Answer

Volt

Answer

Coulomb

Answer

Ohm

Answer

Ampere

Question 24

Which material conducts electricity well?

Accepted Answer

Copper

Answer

Wood

Answer

Rubber

Answer

Plastic

Question 25

What's the magnetic field strength around a straight wire carrying current?

Accepted Answer

Directly proportional to the current

Answer

Zero

Answer

Inversely proportional to the current

Answer

Proportional to the square of the current

Question 26

In a series circuit, what's the relationship between voltage, current, and resistance?

Accepted Answer

V = IR

Answer

I = VR

Answer

R = VI

Answer

VRI

Question 27

What's the purpose of a fuse in an electrical circuit?

Accepted Answer

To prevent excessive current flow

Answer

To regulate voltage

Answer

To store electrical energy

Answer

To measure current

Question 28

Which device is a source of electromotive force (EMF)?

Accepted Answer

Battery

Answer

Resistor

Answer

Capacitor

Answer

Inductor

Question 29

How do conductors differ from semiconductors?

Accepted Answer

Conductors have low resistance, while semiconductors have high resistance

Answer

Conductors have high resistance, while semiconductors have low resistance

Answer

Conductors allow current to flow in one direction, while semiconductors allow current to flow in both directions

Answer

Conductors are made of metal, while semiconductors are made of non-metal

Question 30

What is the SI unit of electric potential difference?

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Coulomb

Question 31

Which of the following is a magnetic material?

Accepted Answer

Iron

Answer

Copper

Answer

Aluminum

Answer

Plastic

Question 32

What shape does the magnetic field around a current-carrying wire take?

Accepted Answer

Circular

Answer

Elliptical

Answer

Parabolic

Answer

Hyperbolic

Question 33

Which of the following can cause an electric current to be induced?

Accepted Answer

Changing magnetic field

Answer

Static magnetic field

Answer

Electric field

Answer

Gravitational field

Question 34

What is the SI unit of magnetic flux density?

Accepted Answer

Tesla

Answer

Weber

Answer

Ampere-meter

Answer

Gauss

Question 35

In a parallel circuit, the total resistance is:

Accepted Answer

Equal to the sum of the reciprocals of the resistances of all branches

Answer

Greater than the resistance of any individual branch

Answer

Less than the resistance of any individual branch

Answer

Equal to the resistance of the branch with the lowest resistance

Question 36

Which of the following is NOT a type of electromagnetic induction?

Accepted Answer

Electrostatic induction

Answer

Self-induction

Answer

Mutual induction

Question 37

Which of the following is a unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Farad

Question 38

The potential difference across a resistor is:

Accepted Answer

Equal to the product of the current and resistance

Answer

Equal to the quotient of the current and resistance

Answer

Equal to the sum of the current and resistance

Answer

Equal to the difference of the current and resistance

Question 39

Which of the following is a semiconductor?

Accepted Answer

Silicon

Answer

Copper

Answer

Aluminum

Answer

Gold

Question 40

The magnetic field around a current-carrying wire is:

Accepted Answer

Circular

Answer

Straight

Answer

Elliptical

Answer

Irregular

Question 41

How does a moving coil galvanometer detect and measure electric currents?

Accepted Answer

The magnetic field created by the current in the coil interacts with the magnetic field of the permanent magnet, causing the coil to move.

Answer

The coil is attracted to the permanent magnet.

Answer

The coil is repelled by the permanent magnet.

Answer

The coil is attracted to the electric field.

Question 42

When exposed to a magnetic field, how do diamagnetic, paramagnetic, and ferromagnetic materials respond differently?

Accepted Answer

Diamagnetic materials weakly repel, paramagnetic materials weakly attract, and ferromagnetic materials strongly attract.

Answer

Diamagnetic materials strongly attract, paramagnetic materials weakly repel, and ferromagnetic materials don't respond.

Answer

Paramagnetic materials strongly attract, diamagnetic materials don't respond, and ferromagnetic materials weakly repel.

Answer

Diamagnetic and paramagnetic materials weakly attract, while ferromagnetic materials don't respond.

Question 43

Explain the direction of the induced current in a conductor when it is moved perpendicular to a magnetic field?

Accepted Answer

According to Fleming's right-hand rule

Answer

According to Fleming's left-hand rule

Answer

Opposite to the direction of motion

Answer

In the same direction as the motion

Question 44

Identify the SI unit of electric potential?

Accepted Answer

Volt

Answer

Ampere

Answer

Coulomb

Answer

Ohm

Question 45

In a simple electric circuit, the current flowing through a resistor is:

Accepted Answer

Directly proportional to the voltage across it.

Answer

Inversely proportional to the voltage across it.

Answer

Independent of the voltage across it.

Answer

Proportional to the resistance of the resistor.

Question 46

An electroscope is primarily used to:

Accepted Answer

Detect the presence and polarity of electric charges

Answer

Measure electric charge

Answer

Store electric energy

Answer

Generate electric current

Question 47

The SI unit of electric potential is the:

Accepted Answer

Volt

Answer

Coulomb

Answer

Ampere

Answer

Tesla

Question 48

The process by which a changing magnetic field induces an electric current in a conductor is known as:

Accepted Answer

Electromagnetic induction

Answer

Electrostatic induction

Answer

Magnetic induction

Answer

Capacitive induction

Question 49

Which of the following is NOT a fundamental law of electromagnetism?

Accepted Answer

Ohm's law

Answer

Gauss's law for magnetism

Answer

Ampere's law

Answer

Faraday's law of induction

Question 50

A transformer primarily functions to:

Accepted Answer

Change AC voltage levels

Answer

Change DC voltage levels

Answer

Change AC current levels

Answer

Change DC current levels

Question 51

Which of the following materials is a semiconductor?

Accepted Answer

Silicon

Answer

Copper

Answer

Aluminum

Answer

Iron

Question 52

Within the International System of Units (SI), which unit is used to measure electric charge?

Accepted Answer

Coulomb (C)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 53

A circuit with a resistance of 10 Ω has a current of 2 A flowing through it. Calculate the potential difference across the circuit.

Accepted Answer

10 V

Answer

5 V

Answer

20 V

Answer

40 V

Question 54

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

Storing electrical energy

Answer

Regulating current flow

Answer

Preventing excessive voltage

Answer

Acting as an electrical insulator

Question 55

Which of the following factors does NOT influence the magnetic force between two electric charges?

Accepted Answer

Speed of the charges

Answer

Magnitude of the charges

Answer

Separation distance between the charges

Answer

Direction of the charges

Question 56

Which unit within the International System of Units (SI) is used to measure magnetic field strength?

Accepted Answer

Tesla (T)

Answer

Weber (Wb)

Answer

Ampere (A)

Answer

Volt (V)

Question 57

In an AC circuit, capacitors exhibit frequency-dependent behavior. How can capacitors be used to filter out specific frequencies?

Accepted Answer

Capacitors act as low-pass filters, allowing low frequencies while blocking high frequencies.

Answer

Capacitors allow all frequencies to pass through, making them unsuitable for filtering.

Answer

Capacitors behave like high-pass filters, allowing high frequencies while blocking low frequencies.

Answer

Capacitors behave identically to resistors in AC circuits, with no frequency-dependent effects.

Question 58

Which of the following statements about the temperature coefficient of resistors is **false**?

Accepted Answer

All resistors have a positive temperature coefficient, meaning their resistance decreases with temperature.

Answer

The temperature coefficient of a resistor determines how its resistance changes with temperature.

Answer

Resistors made from different materials can have different temperature coefficients.

Question 59

Which scientific field utilizes electricity to create medical imaging technologies?

Accepted Answer

Biomedical engineering

Answer

Electronics

Answer

Telecommunications

Answer

Mechanical engineering

Question 60

Which factors significantly influence the efficiency of electric motors?

Accepted Answer

Torque and power factor

Answer

Input voltage and output current

Answer

Resistance and inductance

Answer

Speed and temperature

Question 61

What is the relationship between magnetic energy density (u) and magnetic field strength (B)?

Accepted Answer

u is proportional to B squared.

Answer

u is directly proportional to B.

Answer

u is inversely proportional to B.

Answer

u is inversely proportional to B squared.

Question 62

In the context of electric fields, how can you use the principle of superposition to calculate the electric field at a specific point due to multiple charges?

Accepted Answer

Divide the system into smaller parts, calculate the electric field due to each part individually, and then add them up vectorially.

Answer

Consider only the charge closest to the point.

Answer

Ignore the charges with the smallest magnitude.

Answer

Use the average value of the electric fields due to individual charges.

Question 63

A charged particle is moving through a magnetic field. Describe the particle's motion and explain how the Lorentz force affects its trajectory.

Accepted Answer

The particle moves in a circular path perpendicular to the magnetic field, with a radius proportional to its charge and velocity.

Answer

The particle moves in a straight line parallel to the magnetic field.

Answer

The particle experiences no force and continues moving in a straight line.

Answer

The particle moves in an elliptical path determined by the strength of the magnetic field.

Question 64

Which of the following properties is shared by all electromagnetic waves?

Accepted Answer

They can travel through a vacuum.

Accepted Answer

They have the same speed in a vacuum.

Accepted Answer

They are transverse waves.

Answer

They are non-ionising.