Lesson T4.3.2
T4.3.2 Circuits with heat, light, sound and movement Quiz: KS3 Design & Technology, Unit 4
20 questions
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Lesson T4.3.2, Circuits with heat, light, sound and movement: 20 multiple choice questions for the KS3 Design & Technology (National Curriculum), Unit 4: Technical knowledge, written with Revision Ninja.
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The 20 questions
-
Which component converts electrical energy into heat inside a household kettle?
- Piezo transducer
- Heating element
- Step-down transformer
- Solenoid coil
-
Why do traditional filament lamps waste most of their energy?
- High magnetism
- Filaments get hot
- Too much sound
- Chemical leaks
-
How does a piezo buzzer produce sound waves when a voltage is applied?
- Coil pulls a plunger
- Crystal changes shape
- Magnet spins rapidly
- Air gets superheated
-
Which input device detects sound waves and converts them into electrical signals?
- Microphone
- Speaker
- Buzzer
- Solenoid
-
Which electromagnetic component uses a coil to pull a metal plunger in or out?
- Thermistor
- Solenoid
- Capacitor
- Potentiometer
-
What type of simple switch detects when a product has been angled?
- Reed switch
- Toggle switch
- Push switch
- Tilt switch
-
Which input and output combination is best for a door alarm system?
- Reed switch and buzzer
- Switch and lamp
- Buzzer and LED
- LDR and motor
-
Which component is needed to monitor water temperature in a heating circuit?
- LDR
- Microswitch
- Piezo buzzer
- Thermistor
-
How does the resistance of an LDR change as daylight fades into dusk?
- Resistance falls
- Drops to zero
- Resistance rises
- Stays constant
-
What component is used to let a small microcontroller pin switch a heavy buzzer?
- Resistor
- Capacitor
- Diode
- Transistor
-
How can you reverse the rotational direction of a DC motor?
- Reduce the voltage
- Use an LED
- Swap supply connections
- Add a resistor
-
A heating element has a resistance of 12 ohms and is connected to a 12 V supply. What is its power output?
- 144 W
- 1 W
- 24 W
- 12 W
-
Which change makes a heating wire produce more heat from the same voltage?
- Shorter wire
- Thicker wire
- Lower voltage
- Higher resistance
-
What property of a sound wave determines the pitch of a piezo buzzer?
- Amplitude
- Current
- Frequency
- Voltage
-
Which energy conversion takes place inside an operating loudspeaker?
- Chemical to sound
- Electrical to sound
- Sound to electrical
- Light to electrical
-
What happens to the resistance of an LDR when covered by a hand?
- Resistance drops
- Current stops
- Stays the same
- Resistance increases
-
Which output devices create a flashing light and a sound?
- LED and buzzer
- Resistor and transistor
- Thermistor and LDR
- Motor and switch
-
What happens to the power output of a heating element if its resistance drops?
- Power increases
- Power decreases
- Stays constant
- Power stops
-
Which component converts most of its electrical energy directly into light?
- LED
- Filament lamp
- Heating element
- Piezo buzzer
-
Why does a DC motor slow down when the supply voltage is reduced?
- Magnetic field stops
- Voltage increases
- Current decreases
- Resistance increases
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