L2 Test Review

What is the main difference between analog and digital signals?

• Analog signals are more expensive.

• Digital signals are continuous.

• Analog signals are smooth and continuous; digital signals use separate steps.

• Digital signals can’t carry sound.

What is modulation?

• The process of destroying signals

• Adding noise to a signal

• Changing a wave to carry information

• Blocking a signal with interference

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Why is noise a problem for analog signals?

• It helps transmit them

• It makes the signal faster

• It can blend into the smooth signal and change it

• Noise doesn’t affect analog signals

What is one advantage of digital signals over analog signals?

• They are harder to store

• They are more affected by noise

• They are easier to copy without errors

• They cost more to use

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What does binary mean in digital signals?

• A mixture of waves

• A signal that repeats

• A pattern of 1s and 0s

• A very fast wave

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Which tool most often uses digital signals?

• A fire alarm

• A smart phone

• A smoke signal

• A flashlight

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What does "noise" mean in signal terms?

• Loud music

• Any change or error that gets added to the signal

• The message being sent

• Static electricity

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What is one real-world example of an analog signal?

• A drum beat

• A computer keyboard

• A digital clock

• A thermometer with a needle

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Which signal is more reliable over long distances?

• Analog

• Digital

• Sound

• Visible light

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Which signal is shown in a graph with smooth, wavy lines?

• Digital

• Analog

• Radio

• Binary

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