Signals: Digital vs. Analog Quiz

Which of the following best defines "wavelength" in the context of electromagnetic waves?

• The number of waves that pass a point in one second

• The distance between two consecutive crests of a wave

• The height of the wave from rest position to crest

• The speed at which the wave travels

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True or False: Analog signals can have an infinite number of possible values within a range, while digital signals have only specific, discrete values.

• True

• False

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Which device listed below is NOT typically used to transmit digital signals?

• Cellular phone

• Vinyl record player

• Wi-Fi router

• GPS receiver

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What is the main function of the "encode" process in communication devices?

• To increase the energy of a signal

• To convert information into a form suitable for transmission

• To measure the amplitude of a wave

• To create a magnetic field

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Which of the following is a qualitative example of information?

• The temperature is 25°C

• The sound is loud

• The wavelength is 500 nm

• The frequency is 60 Hz

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A mechanical wave requires which of the following to travel?

• Vacuum

• Medium

• Magnet

• Electric field

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Which statement best describes how digital signals transmit information differently from analog signals?

• Digital signals use continuous waves, while analog signals use discrete pulses.

• Digital signals use discrete values, while analog signals use continuous waves.

• Both use the same method but at different frequencies.

• Analog signals are only used in modern communication devices.

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A student is using a remote control to change the channel on a television. Which type of wave is most likely being used to transmit the signal from the remote to the TV?

• Mechanical wave

• Electromagnetic wave

• Sound wave

• Water wave

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If a Wi-Fi signal is being blocked by a thick wall, which property of the wave is most likely affected?

• Frequency

• Amplitude

• Transmission

• Crest

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A GPS device receives information from satellites in space. Why can electromagnetic waves from satellites reach the GPS device on Earth, but mechanical waves cannot?

• Electromagnetic waves can travel through a vacuum, but mechanical waves require a medium.

• Mechanical waves travel faster than electromagnetic waves.

• GPS devices only detect mechanical waves.

• Electromagnetic waves require a medium to travel.

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