1) What type of radiation does the television remote control emit? a) Ultraviolet b) Gamma c) Infrared d) X-Ray 2) Which kind of signal is emitted by a remote control? a) Analogue b) Digital 3) What type of signal can only have two values? a) Digital b) Analogue 4) How are ‘on’ and ‘off’ often represented in a digital signal? a) 1 and 5 b) 1 and 2 c) 1 and 0 d) 0 and 2 5) What do we call a signal that can have any value? a) Analogue b) Digital 6) If you speak into a microphone your sound is changed into an electric current a) Analogue b) Digital 7) When you speak more loudly, how does the electric current in the microphone change? a) Increases b) Stays the same c) Decreases 8) If you sing a high-pitched note, how does the electric current in the microphone change? a) Frequency increases b) Frequency stays the same c) Frequency stays the same 9) Which kind of signal does a DVD use an analogue or a digital signal? a) Analogue b) Digital 10) What kind of signal does a satellite television use? a) Analogue b) Digital 11) What kind of signal does a tape cassette use? a) Analogue b) Digital 12) Which part of the electromagnetic spectrum is used to transmit television signals? a) Radio b) Gamma c) Ultraviolet d) X-Ray 13) What do we call the system that allows many digital signals to be transmitted simultaneously? a) Multiwave b) Multicoloured c) Multiplex d) Multichannel 14) What do we call unwanted signals? a) interference b) superposition c) resonance d) reflection

P1L14-SignalsQuiz

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