1) One advantage of optical fibers over ordinary cables of the same thickness is: a) they are made of glass b) they can carry more information c) their signals weaken more over long distances 2) How do signals travel through optical fibres? a) As microwaves b) As radio waves c) As infrared radiation or visible light 3) What is a signal that varies continuously in frequency called? a) A digital signal b) An analogue signal c) An AM signal 4) Which type of signal maintains a better quality? a) Digital signal b) Analogue signal c) Both types are the same 5) What sort of signal is this? a) Analogue b) Digital c) Monologue 6) Some signals are made of a series of pulses which are just off or on. These are called: a) analogue signals b) digital signals c) wave signals 7) Signals can pick up random additions on their way to the receiver, making the quality poorer. What word is used for these 'random additions'? a) Dirt b) Noise c) Rubbish 8) What sort of signal is this? a) Monologue b) Analogue c) Digital 9) Which on of the following is easier to remove noise from? a) digital b) analogue 10) We cannot see infrared radiation, but we can feel it as heat energy. Infrared sensors can detect heat from the body. a) True b) False

data transmission world wall quiz 10

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