Introduction to Electricity: Interactive Learning Quizzes

Question 1

How do capacitors store electric charge?

Accepted Answer

By creating an electric field between two conductive plates

Answer

By generating a magnetic field

Answer

By converting electrical energy to chemical energy

Answer

By ionizing the air between two plates

Question 2

Which of the following is NOT a fundamental electric charge**?**

Accepted Answer

-1.602 × 10^-19 C** (correct)**

Answer

+1.602 × 10^-19 C

Answer

+3.204 × 10^-19 C

Answer

0 C

Question 3

The electric field at a point is defined as the force exerted on a positive test charge placed at that point, divided by the:

Accepted Answer

All of the above** (correct)**

Answer

Magnitude of the test charge

Answer

Charge of the source charge

Answer

Permittivity of the medium

Question 4

Which of the following is the SI unit of electric potential**?**

Accepted Answer

Volt** (correct)**

Answer

Coulomb (C)

Answer

Farad (F)

Answer

Ohm (Ω)

Question 5

A capacitor is a device that stores:

Accepted Answer

Electric charge** (correct)**

Answer

Electric field

Answer

Electric potential

Answer

Electric current

Question 6

The energy stored in a capacitor is given by:

Accepted Answer

1/2 CV^2** (correct)**

Answer

CV

Answer

1/2 QV

Answer

Q^2/C

Question 7

Which type of capacitor is formed using two concentric conducting cylinders**?**

Accepted Answer

Cylindrical capacitor** (correct)**

Answer

Parallel-plate capacitor

Answer

Spherical capacitor

Answer

Variable capacitor

Question 8

Which of the following statements correctly describes the properties of electric charge?

Accepted Answer

Electric charges of the same sign repel each other, while opposite charges attract.

Accepted Answer

Electric charge is a conserved quantity, meaning it cannot be created or destroyed.

Answer

Electric charge can only exist as positive or negative charges, never both.

Answer

Electric charge is a scalar quantity, possessing only magnitude without direction.

Question 9

The electric field at a point in space is defined as the force exerted on:

Accepted Answer

A unit positive charge at that point.

Answer

A positive charge at that point.

Answer

A negative charge at that point.

Answer

A unit negative charge at that point.

Question 10

A capacitor is a device that primarily:

Accepted Answer

Stores electric charge

Answer

Produces an electric field

Answer

Converts electrical energy to mechanical energy

Answer

Converts mechanical energy to electrical energy

Question 11

The energy stored in a capacitor is given by:

Accepted Answer

1/2 CV^2

Answer

CV

Answer

1/2 QV

Answer

QV^2

Question 12

Inside a conductor, the electric field is:

Accepted Answer

Zero

Answer

Non-zero and uniform

Answer

Non-zero and non-uniform

Answer

Dependent on the shape of the conductor

Question 13

According to Ohm's law, the current through a resistor is directly proportional to:

Accepted Answer

The voltage across the resistor

Answer

The resistance of the resistor

Answer

The power dissipated by the resistor

Answer

The temperature of the resistor

Question 14

Capacitors have various practical applications beyond storing electrical charge. Which of the following is NOT a common use of capacitors?

Accepted Answer

Energy storage in batteries

Answer

Energy storage in power electronic devices

Answer

Filtering signals in electronic circuits

Question 15

At a junction in a circuit, according to Kirchhoff's current law:

Accepted Answer

The total incoming current equals the total outgoing current.

Answer

The incoming current is always greater than the outgoing current.

Answer

The voltage drop across the junction is directly proportional to the current flowing through it.

Question 16

How are the electric field lines around a positive point charge oriented?

Accepted Answer

Radially outward

Answer

Curved and intersecting

Answer

Random and tangential

Answer

Converging inward

Question 17

Which statement accurately describes the relationship between the potential difference (V) across a capacitor and its capacitance (C)?

Accepted Answer

V is directly proportional to C.

Answer

V is inversely proportional to C.

Answer

V is independent of C.

Answer

V is equal to C.

Question 18

Capacitors are essential components in electronic circuits because they can:

Accepted Answer

Store electrical energy

Answer

Generate electrical current

Answer

Amplify electrical signals

Question 19

Which of the following is **not** a fundamental property of electric charges?

Accepted Answer

Mass

Answer

Charge

Answer

Magnitude

Answer

Sign

Question 20

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

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Question 21

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

Accepted Answer

To store and release electrical energy

Answer

To control the flow of current

Answer

To convert AC to DC

Answer

To amplify voltage

Question 22

What is the net electric charge on a neutral atom?

Accepted Answer

Zero

Answer

Negative

Answer

Positive

Answer

Depends on the atom

Question 23

Which of the following factors affects the capacitance of a capacitor?

Accepted Answer

Plate area, separation distance, and dielectric material

Answer

Frequency and temperature

Answer

Voltage and current

Question 24

What is the SI unit of electric charge?

Accepted Answer

Coulomb

Answer

Ohm

Answer

Ampere

Answer

Volt

Question 25

Electric potential at a point in space is best defined as the:

Accepted Answer

Work done per unit charge in bringing a positive test charge to that point from infinity

Answer

Force per unit charge at that point

Answer

Charge per unit volume at that point

Question 26

Capacitors primarily store energy in the form of:

Accepted Answer

Electric field between its plates

Answer

Kinetic energy of its moving charges

Answer

Magnetic field around its plates

Answer

Gravitational field between its plates

Question 27

The capacitance of a parallel-plate capacitor is:

Accepted Answer

Directly proportional to the plate area and inversely proportional to the distance between the plates

Answer

Directly proportional to the distance between the plates and inversely proportional to the plate area

Question 28

Which of the following materials is NOT a good conductor of electricity?

Accepted Answer

Rubber

Answer

Copper

Answer

Silver

Answer

Gold

Question 29

In conventional current flow, the direction of the current is:

Accepted Answer

From positive to negative

Answer

From negative to positive

Answer

Random

Answer

Dependent on the circuit

Question 30

Ohm's law states that the voltage across a resistor is:

Accepted Answer

Directly proportional to the current flowing through it

Answer

Equal to the current flowing through it

Answer

Inversely proportional to the current flowing through it

Answer

Independent of the current flowing through it

Question 31

Which of the following is a common source of electromotive force (EMF) in electrical circuits?

Accepted Answer

Battery

Answer

Capacitor

Answer

Inductor

Answer

Resistor

Question 32

In a series circuit, the:

Accepted Answer

Current is the same at all points in the circuit

Answer

Voltage is the same at all points in the circuit

Answer

Power is the same at all points in the circuit

Answer

Resistance is the same at all points in the circuit

Question 33

An electric field is defined as the region of space surrounding an electric charge where its influence can be detected. It is a vector quantity and its strength decreases as the square of the distance from the charge. Which of the following is the SI unit of electric field strength?

Accepted Answer

Volt per meter (V/m)

Answer

Coulomb per square meter (C/m^2)

Answer

Ampere (A)

Answer

Newton (N)

Question 34

Electric current, measured in Amperes (A), quantifies the amount of electric charge flowing through a designated area per unit time. Which of the following is the precise definition of electric current?

Accepted Answer

Rate of flow of electric charge

Answer

Energy stored in an electric field

Answer

Force exerted on an electric charge

Answer

Potential difference between two points

Question 35

Ohm's law describes the relationship between voltage, current, and resistance in an electrical circuit, provided the temperature remains constant. Which equation accurately represents Ohm's law?

Accepted Answer

Voltage = Current × Resistance (V = IR)

Answer

Current = Voltage × Resistance (I = VR)

Answer

Resistance = Voltage × Current (R = VI)

Answer

Voltage = Resistance × Current (V = RI)

Question 36

Kirchhoff's current law, often used in circuit analysis, states that the sum of currents entering a junction should be equal to the sum of currents leaving the junction. Which of the following is a practical application of Kirchhoff's current law?

Accepted Answer

Analyzing electrical circuits

Answer

Calculating the voltage across a resistor

Answer

Measuring the resistance of a conductor

Answer

Determining the power dissipated by a resistor

Question 37

Kirchhoff's voltage law, another fundamental law in circuit analysis, states that the algebraic sum of voltages around any closed loop in a circuit should be zero. Which of the following is a practical application of Kirchhoff's voltage law?

Accepted Answer

Determining the voltage gain of an amplifier

Answer

Measuring the resistance of a conductor

Answer

Calculating the current flowing through a resistor

Question 38

A positive charge is placed in a uniform electric field. Which direction will the charge move?

Accepted Answer

In the direction of the electric field.

Answer

Opposite to the direction of the electric field.

Answer

The charge will not move.

Answer

Perpendicular to the electric field.

Question 39

What is the electric potential energy of a +2 μC charge placed at a point where the electric potential is 500 V?

Accepted Answer

1 mJ

Answer

1000 J

Answer

500 μJ

Answer

250 μJ

Question 40

Two parallel plates are separated by a distance of 1 cm and have a potential difference of 100 V. What is the magnitude of the electric field between the plates?

Accepted Answer

10,000 V/m

Answer

10 V/m

Answer

1,000 V/m

Answer

100 V/m

Question 41

A capacitor is connected to a battery and charged. What happens to the capacitance of the capacitor if the distance between the plates is increased?

Accepted Answer

The capacitance decreases.

Answer

The capacitance increases.

Answer

The capacitance becomes zero.

Answer

The capacitance remains the same.

Question 42

A parallel-plate capacitor has a capacitance of 10 μF. If the voltage across the capacitor is increased from 10 V to 20 V, what happens to the charge stored in the capacitor?

Accepted Answer

The charge doubles.

Answer

The charge remains the same.

Answer

The charge quadruples.

Answer

The charge halves.

Question 43

Which of the following is NOT a unit of electric charge?

Accepted Answer

Volt

Answer

Faraday

Answer

Coulomb

Answer

Ampere-second

Question 44

A conductor is a material that allows for the free movement of:

Accepted Answer

Electrons

Answer

Protons

Answer

Neutrons

Question 45

What is the principle of superposition as it applies to electric fields?

Accepted Answer

The net electric field at a point due to multiple charges is the vector sum of the individual electric fields.

Answer

The electric field is always perpendicular to the direction of charge movement.

Question 46

A dielectric material is inserted between the plates of a capacitor. What effect does this have on the capacitance?

Accepted Answer

The capacitance increases.

Answer

The capacitance becomes zero.

Answer

The capacitance remains the same.

Answer

The capacitance decreases.

Question 47

Which of the following is the SI unit of electric charge?

Accepted Answer

Coulomb

Answer

Ohm

Answer

Ampere

Answer

Volt

Question 48

The electric field at a point is defined as the force experienced by:

Accepted Answer

A positive test charge placed at that point

Answer

A neutral test charge placed at that point

Answer

An electron placed at that point

Answer

A negative test charge placed at that point

Question 49

Which of the following materials is an electrical insulator?

Accepted Answer

Rubber

Answer

Aluminum

Answer

Water

Answer

Copper

Question 50

The electric potential at a point is defined as the work done in:

Accepted Answer

Bringing a positive charge from infinity to that point

Answer

Moving a positive charge from one point to another

Answer

Bringing a negative charge from infinity to that point

Question 51

A capacitor is a device that stores:

Accepted Answer

Electric charge

Answer

Electric potential

Answer

Electric current

Answer

Electric field

Question 52

The capacitance of a capacitor depends on:

Accepted Answer

The area of the plates and the distance between them

Answer

The type of material used for the plates

Answer

The voltage applied across the plates

Question 53

When a capacitor is charged, the electric field between the plates is:

Accepted Answer

Uniform

Answer

Non-uniform

Answer

Zero