Year 9 Technology Quiz

What is the purpose of a nightlight as described in the design process?

• To illuminate a room when it's dark
• To play music when the room is quiet
• To heat a room
• To cool a room

Which component is responsible for detecting light levels in the nightlight circuit?

• Transistor
• LDR
• LED
• Resistor

What does the acronym LDR stand for?

• Light Dependent Resistor
• Light Direct Resistor
• Low Dim Resistor
• Low Direct Resistor

What happens to the resistance of an LDR when it is dark?

• It increases
• It decreases
• It stays the same
• It fluctuates

Which law is used to describe the relationship between voltage, current, and resistance?

• Ohm's Law
• Kirchhoff's Law
• Faraday's Law
• Newton's Law

What component is used to protect an LED from excessive current?

• Resistor
• Capacitor
• Transistor
• Switch

What is the purpose of a Darlington pair in the circuit?

• To amplify weak signals
• To reduce voltage
• To increase current
• To change resistance

What does a resistor's fourth color band represent?

• The tolerance
• The resistance
• The temperature
• The voltage

What is the unit of measurement for resistance?

• Ohms
• Volts
• Amperes
• Watts

What type of switch is commonly used in a nightlight circuit?

• SPST switch
• Push button switch
• Rotary switch
• DPDT switch