Which of the following is true about the difference between data and signals?

• Data and signals are identical concepts in communication.

• Data is the raw entity; signals are the transmission form of data.

• Signals exist only in digital form, while data can be both analog and digital.

• Data always requires analog signals to be transmitted.

Which type of signal is more resilient to noise but requires more bandwidth?

• Analog signal

• Digital signal

• Composite signal

• Periodic signal

An analog sine wave is often used in communication theory because:

• It has infinite bandwidth.

• It is the simplest form of a periodic signal.

• It requires no medium for propagation.

• It can represent digital bits directly.

Which of the following parameters of a sine wave determines its energy level in transmission?

• Frequency

• Phase

• Amplitude

• Spectrum

Which of the following best describes a composite signal?

• A signal with only one frequency component

• A signal made by digital-to-analog conversion only

• A signal formed by multiple sine waves combined

• A digital waveform with infinite frequency

The spectrum of a signal refers to:

• The physical medium that carries the signal

• The range of frequencies that compose the signal

• The voltage levels used in digital signaling

• The number of cycles per second

In communication, the bandwidth of a medium is:

• The maximum data rate achievable

• The frequency range the medium can pass without significant loss

• The number of voltage levels supported

• The number of cycles completed per second

Which statement best explains why digital signals are more suitable for computer networks?

• They consume less bandwidth than analog signals.

• They are less sensitive to noise and easier to regenerate.

• They provide continuous representation of information.

• They eliminate the need for synchronization.

Which property of analog signals makes them more prone to distortion over long distances?

• They require infinite bandwidth.

• They use discrete values.

• They are continuous and can assume infinite values.

• They always depend on phase shift.

In signal analysis, Fourier's theorem states that:

• Every signal must be digital to be transmitted.

• Every periodic signal can be decomposed into a set of sine waves.

• Only analog signals can be represented mathematically.

• The bandwidth of a signal is infinite.