1. gradually rises from 0 to 9V immediately drops from 9V to 0V
In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the voltage across the capacitor 9V S R C
remains at 0V
gradually rises from 0 to 9V
immediately drops from 9V to 0V
gradually drops from 9V to 0V
remains at 9V

2. Identify the circuit symbol shown
AND gate
OR gate
NOT gate
diode
LED

3. Which of the following electronic devices contains a counter circuit?
Automatic parking light
Digital stopwatch
Electronic thermometer
Intercom
Radio receiver

4. A baby alarm needs an output device that transforms electrical energy into sound energy. Which of the following is suitable?
Electric Motor
LED
Loudspeaker
Relay
Solenoid

5. Which of the following devices contains a counter circuit?
Amplifier
Intercom
Burglar alarm
Computer
Radio receiver

6. The purpose of the amplifier in a personal stereo is to
convert an analogue signal to a digital signal
transform an electrical signal to a sound signal
transform a sound signal to an electrical signal
increase the frequency of an electrical signal
increase the amplitude of an electrical signal

7. Which of the following is an output device?
LDR
LED
Microphone
Solar cell
Thermistor

8. A telephone answering machine contains a loudspeaker, which is used in playing back any message received. The main energy transfer in the loudspeaker is
electrical to sound
sound to electrical
chemical to sound
sound to chemical
electrical to chemical

9. Which of the following is an input device?
Relay
Buzzer
Solenoid
Loudspeaker
Microphone

10. The symbol below is used to represent a component in an electronic circuit.
What does it represent?
A NOT gate
An AND gate
A LDR
A LED
An OR gate

11. Which of the following does not need a magnetic field to make it work?
Relay
Solenoid
Electric Motor
Electric Bell
Amplifier

12. The following symbol is used in circuit diagrams
The following symbol is used in circuit diagrams. The symbol represents a
light emitting diode (LED)
light dependent resistor (LDR)
transistor
variable resistor
battery

13. A…