What is a key characteristic of an analog signal?

• It can only take two distinct values.

• It varies continuously in both amplitude and frequency.

• It is sent as a series of pulses.

• It is easily interpreted by computers.

How is a person's voice sent through a cellular phone using analog and digital signals?

• Voice signals are transmitted as light pulses through fiber optics in cellular phones that is then turned into electrical signals.

• A person's voice is sent through a cellular phone using only sound waves without any conversion.
• A person's voice is sent by converting it into electrical signals or binary data for transmission over the network.

• A person's voice is recorded and stored on the phone's memory before being sent by electrical signals as a text message

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In a typical phone call using digital signals, what happens to the analog voice signal after it enters the phone?

• It is immediately sent out as an analogue electrical signal.

• It is converted to a digital signal and then sent via microwaves.

• It is amplified and then sent directly to a satellite.

• It is converted to a digital signal and then sent down copper wires.

How does a digital signal handle noise or interference during transmission over long distances?

• It amplifies the noise along with the signal, making it difficult to recover the original.

• It is completely immune to noise and interference.

• It picks up noise, but the original signal can still be perfectly recovered.

• It converts the noise into a different type of signal.

Which of the following is an advantage of digital signals over analog signals?

• They are simpler to generate.

• They are less prone to signal loss over short distances.

• They can carry more information and are easily interpreted by computers.

• They require less power for transmission.