Electronics for Year 8: Master Electrical Circuits and Devices

Question 1

What is an example of how an electrical circuit is used in our daily lives?

Accepted Answer

A flashlight

Answer

A bicycle

Answer

A book

Answer

A tree

Question 2

How does temperature typically affect the resistance of a metal wire?

Accepted Answer

Resistance increases as temperature increases.

Answer

Resistance decreases as temperature increases.

Question 3

When working with electricity, it's important to be aware of potential hazards. Which of the following actions can help minimize these risks?

Accepted Answer

Following safety protocols like using insulated tools, wearing appropriate attire, and working on de-energized circuits

Answer

Ignoring safety guidelines and working on live circuits without proper insulation

Answer

Using damaged or frayed wires while neglecting to wear protective gear

Question 4

Which of the following is NOT a type of electronic circuit?

Accepted Answer

Magnetic circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Combination circuit

Question 5

What is electromagnetic induction? Give two examples of how it is used in everyday life.

Accepted Answer

Electromagnetic induction is when electricity is created in a conductor when a magnetic field changes around it.

Accepted Answer

Electromagnetic induction is used to generate electricity in power stations.

Answer

Electromagnetic induction is only between two magnets.

Answer

Electromagnetic induction is not used in headphones.

Question 6

How does increasing the number of turns in a coil affect the magnetic field created?

Accepted Answer

Increases the magnetic field strength

Answer

Decreases the magnetic field strength

Answer

No effect on the magnetic field strength

Question 7

Which circuit uses a transistor and a logic gate to produce the output 'ON' only when both inputs are 'ON' (representing the AND logic function)?

Accepted Answer

A circuit combining a transistor and a logic gate to control an output based on two inputs.

Answer

A circuit where a transistor boosts the strength of an input signal.

Answer

A circuit where a transistor acts like a switch to turn an LED on or off.

Answer

A circuit where a logic gate processes two input signals to perform a logical operation.

Question 8

You've built an electronic circuit with a battery, switch, LED, and wires, but the LED isn't lighting up. What's the first step in troubleshooting the circuit?

Accepted Answer

Check the switch.

Answer

Replace the battery.

Answer

Measure the voltage across the LED.

Question 9

In an alternating current (AC) circuit, which term refers to the combined effect of resistance, capacitance, and inductance on the flow of electric current?

Accepted Answer

Impedance

Answer

Conductance

Answer

Reactance

Question 10

When designing and using electronic devices, which ethical considerations are important to keep in mind?

Accepted Answer

Making devices durable to reduce waste

Accepted Answer

Using recyclable materials in manufacturing

Accepted Answer

Using repairable parts to extend device lifespan

Answer

Adding unnecessary features for profit

Question 11

Which of these is NOT part of a transistor?

Accepted Answer

Resistor

Answer

Emitter

Answer

Base

Answer

Collector

Question 12

What is the main purpose of a breadboard in electronics?

Accepted Answer

To test and experiment with circuit designs temporarily

Answer

To permanently join components together

Answer

To store electronic components

Answer

To generate electricity

Question 13

Which of the following is NOT a basic electrical circuit component?

Accepted Answer

Magnet

Answer

Battery

Answer

Resistor

Answer

Capacitor

Question 14

What is the SI unit of measurement for electrical current?

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Watt

Question 15

Which type of circuit allows current to flow in a single direction?

Accepted Answer

Diode circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Closed circuit

Question 16

Which safety precaution is most important to follow when working with electricity?

Accepted Answer

Never touch exposed wires.

Answer

Wear gloves when handling wires.

Answer

Use a multimeter to test wires before touching them.

Answer

Always work in a well-lit area.

Question 17

What is the main purpose of a fuse in a circuit?

Accepted Answer

To protect the circuit from excessive current

Answer

To store electrical energy

Answer

To regulate the flow of current

Answer

To amplify signals

Question 18

What is the primary function of a resistor in a circuit?

Accepted Answer

To limit the flow of current and prevent damage

Answer

To allow current to flow freely

Answer

To store electrical energy

Answer

To amplify electrical signals

Question 19

What is a key function of a diode?

Accepted Answer

To allow current to flow in only one direction

Answer

To amplify electrical signals

Answer

To store electrical energy

Answer

To regulate voltage

Question 20

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

Accepted Answer

Metal

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 21

What is the unit used to measure electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Farad

Question 22

What is the main purpose of a breadboard in electronics?

Accepted Answer

To allow for quick and temporary circuit prototyping

Answer

To provide a permanent electrical connection

Answer

To store electronic components

Answer

To amplify electrical signals

Question 23

What is the unit of measurement for the flow of electrical charge?

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Watt

Question 24

Which electronic component is used to regulate the flow of electricity in a circuit?

Accepted Answer

Resistor

Answer

Diode

Answer

Capacitor

Answer

Inductor

Question 25

Which of the following materials is a semiconductor?

Accepted Answer

Silicon

Answer

Wood

Answer

Plastic

Answer

Metal

Question 26

What is the main function of a printed circuit board (PCB) in an electronic device?

Accepted Answer

To connect electrical components

Answer

To store data

Answer

To power the device

Answer

To amplify signals

Question 27

What is the function of a diode?

Accepted Answer

To allow electric current to flow in one direction only

Answer

To store electrical charge

Answer

To amplify signals

Answer

To regulate voltage

Question 28

Which of the following is a semiconductor material?

Accepted Answer

Silicon

Answer

Copper

Answer

Aluminum

Answer

Iron

Question 29

What is the unit of measurement for electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Watt

Question 30

What is the main function of a resistor in an electrical circuit?

Accepted Answer

To control the flow of current

Answer

To store electrical energy

Answer

To amplify signals

Answer

To convert AC to DC

Question 31

Which unit is used to measure electrical current?

Accepted Answer

Amperes

Answer

Volts

Answer

Ohms

Answer

Farads

Question 32

What is the key difference between a conductor and an insulator?

Accepted Answer

Conductors allow electricity to flow easily, while insulators do not.

Answer

Insulators allow electricity to flow easily, while conductors do not.

Answer

Conductors are made of metal, while insulators are made of plastic.

Answer

Insulators are made of metal, while conductors are made of plastic.

Question 33

What is the primary purpose of a simple electronic circuit?

Accepted Answer

To control the flow of electricity

Answer

To amplify signals

Answer

To convert AC to DC

Answer

To store electrical energy

Question 34

Which of the following is NOT a step in the electronic design process?

Accepted Answer

Install the circuit

Answer

Identify the problem

Answer

Design the circuit

Answer

Test the circuit

Question 35

What is the primary function of a resistor within an electrical circuit?

Accepted Answer

Control the flow of current

Answer

Store electrical energy

Answer

Generate electrical energy

Answer

Amplify electrical signals

Question 36

Which material type possesses the property of being able to conduct electricity under certain conditions?

Accepted Answer

Semiconductor

Answer

Conductor

Answer

Insulator

Answer

Superconductor

Question 37

What is the key characteristic of a diode in an electrical circuit?

Accepted Answer

Allows current flow in one direction only

Answer

Blocks current flow in both directions

Answer

Stores electrical charge

Answer

Amplifies electrical signals

Question 38

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

Accepted Answer

Store electrical charge

Answer

Control the flow of current

Answer

Generate electrical signals

Answer

Amplify electrical power

Question 39

Which of these is a common type of transistor?

Accepted Answer

Bipolar Junction Transistor (BJT)

Answer

Light-Emitting Diode (LED)

Answer

Integrated Circuit (IC)

Answer

Resistor

Question 40

What is the primary purpose of a printed circuit board (PCB) in electronics?

Accepted Answer

Connect electrical components together

Answer

Provide a base for mounting components

Answer

Amplify electrical signals

Answer

Store electrical energy

Question 41

How do analogue signals differ from digital signals?

Accepted Answer

Analogue signals are continuous, while digital signals are discrete

Answer

Digital signals are continuous, while analogue signals are discrete

Answer

Analogue signals are used for data transmission, while digital signals are used for sound

Answer

Digital signals are used for data transmission, while analogue signals are used for sound

Question 42

What is the main purpose of a resistor in an electronic circuit?

Accepted Answer

To control the flow of current

Answer

To store electrical energy

Answer

To amplify signals

Answer

To generate electricity

Question 43

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

Accepted Answer

To store electrical energy

Answer

To block DC current

Answer

To amplify signals

Answer

To protect against electrical surges

Question 44

What is the main difference between a conductor and an insulator?

Accepted Answer

Conductors allow electricity to flow easily, while insulators do not

Answer

Insulators allow electricity to flow easily, while conductors do not

Answer

Conductors are used to carry electricity, while insulators are used to protect against electrical shocks

Answer

Insulators are used to carry electricity, while conductors are used to protect against electrical shocks

Question 45

Which of the following tools is primarily used for soldering electronic components together?

Accepted Answer

Soldering iron

Answer

Wire strippers

Answer

Multimeter

Answer

Breadboard

Question 46

What is the main purpose of a breadboard in electronics?

Accepted Answer

To provide a temporary platform for testing circuits

Answer

To permanently connect electronic components

Answer

To measure electrical properties

Answer

To store electrical energy

Question 47

What is the primary function of a transistor in an electronic circuit?

Accepted Answer

To switch electrical signals

Answer

To amplify signals

Answer

To store electrical energy

Answer

To generate electricity

Question 48

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

Accepted Answer

To control the flow of electrical current

Answer

To store electrical energy

Answer

To amplify electrical signals

Answer

To generate electricity

Question 49

Which electronic device converts alternating current (AC) to direct current (DC)?

Accepted Answer

Rectifier

Answer

Diode

Answer

Transistor

Answer

Capacitor

Question 50

What is the unit used to measure electrical current?

Accepted Answer

Amperes

Answer

Volts

Answer

Ohms

Answer

Watts

Question 51

When is an electrical circuit considered 'open'?

Accepted Answer

When there is no complete path for current to flow

Answer

When there is a complete path for current to flow

Answer

When the power source is turned off

Answer

When the switch is closed

Question 52

What is the main use of a breadboard in electronics?

Accepted Answer

To construct temporary circuits

Answer

To test electronic components

Answer

To store electrical energy

Answer

To amplify electrical signals

Question 53

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

Accepted Answer

To store electrical energy

Answer

To control the flow of electrical current

Answer

To amplify electrical signals

Answer

To generate electricity

Question 54

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

Accepted Answer

To permit electrical current to flow in one direction only

Answer

To amplify electrical signals

Answer

To store electrical energy

Answer

To generate electricity

Question 55

In an AC circuit, which property of an inductor causes it to resist changes in current flow?

Accepted Answer

Inductance

Answer

Resistance

Answer

Capacitance

Question 56

Which of these is an older technology in electronics?

Accepted Answer

Transistors

Answer

Virtual reality

Answer

Cloud computing

Answer

Artificial intelligence

Question 57

What should you always prioritize when building electrical circuits?

Accepted Answer

Staying safe with electricity

Answer

Using the right tools

Answer

Following instructions closely

Answer

Wearing suitable clothes

Question 58

How does an inductor affect the current flow in an AC circuit?

Accepted Answer

It decreases the current flow.

Answer

It increases the current flow.

Answer

It has no effect on the current flow.

Question 59

Which of the following materials allows electricity to flow through it easily?

Accepted Answer

Metal

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 60

What is the main function of a resistor in a circuit?

Accepted Answer

To reduce the flow of current

Answer

To increase the flow of current

Answer

To store electrical energy

Answer

To generate electrical energy

Question 61

Which unit is used to measure electrical current?

Accepted Answer

Ampere

Answer

Voltage

Answer

Resistance

Answer

Power

Question 62

What is the key difference between a series circuit and a parallel circuit?

Accepted Answer

Series circuits have only one path for current flow, while parallel circuits have multiple.

Answer

Series circuits have multiple paths for current flow, while parallel circuits have only one.

Answer

Series circuits have higher resistance than parallel circuits.

Answer

Parallel circuits have higher resistance than series circuits.

Question 63

Which electronic component is commonly used to make signals stronger?

Accepted Answer

Transistor

Answer

Diode

Answer

Capacitor

Answer

Inductor

Question 64

What is the main purpose of a capacitor in a circuit?

Accepted Answer

To store electrical energy

Answer

To release electrical energy

Answer

To regulate voltage

Answer

To convert AC to DC