In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the volt

1
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 symbol represents a

• light emitting diode (LED)
• light dependent resistor (LDR)
• transistor
• variable resistor
• battery

13

• A