Quiz on Analogue and Digital Signals

How is a digital signal represented?

• By a continuous wave

• By a range of values

• By 0 for off and 1 for on

• By varying voltages

What is the role of integrated circuits (ICs) in electronic systems?

• To provide power to the system

• To control processes and perform tasks

• To convert digital signals to analogue

• To act as a storage device

What is the main use of a 555 timer in circuits?

• Timing

• Data storage

• Signal amplification

• Power regulation

What is the first step in the astable process?

• The output is turned off

• The system is turned off

• The astable is turned on

• The output is turned on

What is the unit of frequency?

• Seconds

• Hertz

• Metres

• Volts

What is the purpose of a microcontroller in the seatbelt alarm example?

• To measure speed

• To control the buzzer

• To display time

• To adjust volume

How long does the buzzer stay on in the seatbelt alarm programme?

• 1 second

• 0.5 seconds

• 2 seconds

• 3 seconds

Which chip is used for a 7-segment display decoder-driver?

• 4017

• 4026

• 555

• 7400

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

• To store energy

• To amplify signals

• To limit current

• To convert AC to DC

Which component is used to store electrical energy in a circuit?

• Resistor

• Capacitor

• Inductor

• Diode