Question 10
- List three symptoms of a faulty mobile phone microphone.
- List three components of a mobile phone that has polarity.
Candidates’ performance on this question was excellent.
Observation
The expected answers are:
(a) Symptoms of a faulty mobile phone microphone
- poor audio quality during phone call / receiver cannot hear the caller’s voice (one way conversation)
- change in sound / callers voice is distorted to the receiver
- sound interruption / receiver can hear the caller on some occasions but not all the time
(b) Components of a mobile phone with polarity
- backup battery
- electrolytic / polarised capacitor
- battery terminal connector
- mouthpiece / microphone
- earpiece / speaker
- vibrator / motor
- buzzer / ringer / loudspeaker
- transistor
- regulator
- charging port
- diode