Electric Circuits: Interactive Quizzes and Practice Questions

Question 1

According to Ohm's law, the relationship between current and voltage in a conductor is:

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Equal

Answer

Independent

Question 2

In a series circuit configuration, the total resistance:

Accepted Answer

Equals the sum of individual resistances

Answer

Is lesser than the sum of individual resistances

Answer

Is greater than the sum of individual resistances

Answer

Depends on the number of resistors

Question 3

Which of the following is NOT a manifestation of electrical energy?

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Thermal energy

Answer

Magnetic energy

Question 4

Kirchhoff's current law implies that the total current entering a junction:

Accepted Answer

Is equal to the total current leaving the junction

Answer

Is greater than the total current leaving the junction

Answer

Is less than the total current leaving the junction

Answer

Is independent of the current entering the junction

Question 5

A resistor primarily serves to:

Accepted Answer

Hinder current flow

Answer

Permit unimpeded current flow

Answer

Store electrical energy

Answer

Generate electrical energy

Question 6

In a parallel circuit arrangement, the total resistance:

Accepted Answer

Is lesser than the sum of individual resistances

Answer

Equals the sum of individual resistances

Answer

Is greater than the sum of individual resistances

Answer

Depends on the number of resistors

Question 7

Which unit is used to measure electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Coulomb

Question 8

A capacitor is a device that:

Accepted Answer

Stores electrical charge

Answer

Generates electrical current

Answer

Dissipates electrical energy

Answer

Blocks electrical flow

Question 9

Ignoring others, which safety measure should NOT be taken when handling electrical circuits?

Accepted Answer

Standing on a wet floor

Answer

Wearing appropriate clothing

Answer

Using insulated tools

Answer

Never working alone

Question 10

In the circuit diagram, which component experiences the greatest voltage drop when current flows through the circuit?

Accepted Answer

Resistor

Answer

Battery

Answer

Capacitor

Answer

Connecting Wires

Question 11

In the International System of Units (SI), what is the base unit for measuring electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Coulomb

Question 12

According to Ohm's Law, the current (I) flowing through a conductor is directly proportional to the:

Accepted Answer

Voltage (V)

Answer

Resistance (R)

Answer

Temperature (T)

Answer

Cross-sectional area (A)

Question 13

Which component is NOT typically found in a basic electric circuit?

Accepted Answer

Transistor

Answer

Battery

Answer

Resistor

Answer

Wire

Question 14

In a parallel circuit, how does the current distribution compare to the total current?

Accepted Answer

Equal to the total current

Answer

Inversely proportional to the resistance

Answer

Proportional to the resistance

Answer

Zero

Question 15

Which primary function do fuses serve in electric circuits?

Accepted Answer

Protecting against excessive current

Answer

Preventing overheating

Answer

Limiting voltage drop

Answer

Improving conductivity

Question 16

Kirchhoff's Current Law states that the total current entering a junction in a circuit is:

Accepted Answer

Equal to the total current leaving the junction

Answer

Zero

Answer

Proportional to the voltage

Answer

Inversely proportional to the resistance

Question 17

In a series circuit, how is the total resistance related to the individual resistances?

Accepted Answer

Equal to the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Zero

Question 18

Which of the following is NOT a basic electrical component found in circuits?

Accepted Answer

Transistor

Answer

Resistor

Answer

Capacitor

Answer

Battery

Question 19

According to Ohm's law, the voltage across a resistor is directly proportional to the:

Accepted Answer

Current passing through the resistor

Answer

Resistance of the resistor

Answer

Power dissipated by the resistor

Answer

Inductance of the resistor

Question 20

The standard unit for measuring electrical power is the:

Accepted Answer

Watt

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 21

Which of the following devices is used to store electrical energy?

Accepted Answer

Capacitor

Answer

Resistor

Answer

Inductor

Answer

Diode

Question 22

The primary purpose of a circuit breaker is to:

Accepted Answer

Interrupt the circuit when current exceeds a safe level

Answer

Complete the circuit when current drops below a safe level

Answer

Increase the resistance of the circuit

Answer

Decrease the voltage of the circuit

Question 23

Which of the following materials is a conductor of electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Rubber

Answer

Wood

Question 24

A transformer is a device primarily used to:

Accepted Answer

Alter the voltage of a circuit

Answer

Alter the current of a circuit

Answer

Alter the resistance of a circuit

Answer

Alter the frequency of a circuit

Question 25

In an RLC circuit, which components determine the resonant frequency? Explain the role of each component in this determination.

Accepted Answer

All three components (Resistor, Inductor, Capacitor) determine resonant frequency.

Answer

Capacitor only determines resonant frequency.

Answer

Inductor only determines resonant frequency.

Answer

Resistor only determines resonant frequency.

Question 26

Which of the following is NOT a fundamental concept in the analysis of electric circuits?

Accepted Answer

Resistance and Capacitance

Answer

Ohm's law

Answer

Kirchhoff's laws

Answer

Voltage and Current

Question 27

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

Accepted Answer

Voltage (V)

Answer

Resistance (R)

Answer

Frequency (f)

Answer

Capacitance (C)

Question 28

Which of Kirchhoff's laws states that the algebraic sum of currents at any junction in a circuit is zero?

Accepted Answer

Current law

Answer

Voltage law

Answer

Loop law

Answer

Power law

Question 29

A circuit diagram represents:

Accepted Answer

The electrical connections between components

Answer

The physical layout of circuit components

Answer

The mathematical equations describing circuit behaviour

Answer

The voltage and current measurements in the circuit

Question 30

Which of the following is a typical instrument used to measure current in an electric circuit?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Galvanometer

Question 31

What is the unit of electrical resistance?

Accepted Answer

Ohm (Ω)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Farad (F)

Question 32

Which of the following materials is typically used as an insulator in electric circuits?

Accepted Answer

Rubber

Answer

Copper

Answer

Silver

Answer

Aluminium

Question 33

What is the purpose of a fuse in an electric circuit?

Accepted Answer

To protect the circuit from overcurrent

Answer

To provide a low-resistance path for current flow

Answer

To regulate the voltage in the circuit

Answer

To store electrical energy

Question 34

Which factors determine the resistance of a metallic conductor?

Accepted Answer

Length, cross-sectional area, and material composition

Answer

Voltage, current, and power

Answer

Temperature and magnetic field

Answer

Frequency and wavelength

Question 35

Which of the following describes a key characteristic of transistors?

Accepted Answer

Transistors have three terminals.

Answer

Transistors can only amplify current.

Answer

Transistors are only used as switches in circuits.

Question 36

In an electric circuit, which of the following is a closed path for current to flow?

Accepted Answer

Loop

Answer

Branch

Answer

Node

Answer

Component

Question 37

According to Ohm's law, the voltage (V) across a resistor is directly proportional to which variable?

Accepted Answer

Current (I)

Answer

Power (P)

Answer

Resistance (R)

Answer

Frequency (f)

Question 38

In a parallel circuit, which of the following quantities is the same for all branches?

Accepted Answer

Voltage

Answer

Power

Answer

Resistance

Answer

Current

Question 39

Which of the following is NOT a component of a circuit breaker?

Accepted Answer

Resistor

Answer

Solenoid

Answer

Bimetallic strip

Question 40

What is the standard international unit of electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 41

In a series circuit, the total resistance (RT) is calculated by:

Accepted Answer

Adding the individual resistances

Answer

Adding the individual voltages

Answer

Adding the individual currents

Answer

Adding the individual powers

Question 42

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

Accepted Answer

To store electrical energy

Answer

To protect against short circuits

Answer

To increase current flow

Answer

To reduce voltage drop

Question 43

Which of the following is NOT a critical safety precaution when working with electrical circuits?

Accepted Answer

Using bare wires

Answer

Avoiding contact with water

Answer

Checking for live wires

Answer

Wearing insulated gloves

Question 44

What is the main purpose of a transformer in an electrical circuit?

Accepted Answer

To change voltage levels

Answer

To control current flow

Answer

To store electrical energy

Question 45

A circuit has a resistance of 10 ohms and a current of 2 amperes. What is the voltage across the circuit?

Accepted Answer

20 volts

Answer

8 volts

Answer

5 volts

Question 46

The unit of electrical resistance is:

Accepted Answer

Ohm (Ω)

Answer

Watt (W)

Answer

Volt (V)

Answer

Ampere (A)

Question 47

In a series circuit, how does the current behave at different components?

Accepted Answer

It remains the same throughout the circuit.

Answer

It decreases at each component.

Answer

It varies depending on the component.

Answer

It increases at each component.

Question 48

What is the combined resistance of two 5-ohm resistors connected in parallel?

Accepted Answer

2.5 ohms

Answer

10 ohms

Answer

1 ohm

Answer

25 ohms

Question 49

According to Kirchhoff's Current Law, the sum of currents entering a junction is equal to:

Accepted Answer

The sum of currents leaving the junction.

Answer

Zero

Answer

The total resistance of the circuit.

Answer

The voltage across the junction.

Question 50

Which electrical component stores energy in an electric field?

Accepted Answer

Capacitor

Answer

Inductor

Answer

Transistor

Answer

Resistor

Question 51

What effect does doubling the length of a wire have on its resistance?

Accepted Answer

It doubles its resistance.

Answer

It quadruples its resistance.

Answer

It remains the same.

Answer

It halves its resistance.

Question 52

Which material is NOT a good conductor of electricity?

Accepted Answer

Rubber

Answer

Aluminum

Answer

Silver

Answer

Copper

Question 53

In a circuit diagram, what does the symbol '—||—' represent?

Accepted Answer

An open switch

Answer

A resistor

Answer

A battery

Answer

A closed switch