In this section of Data Communication and Networking – Data and Signals MCQ (Multiple Choice) Based Questions and Answers,it cover the below lists of topic, All the Multiple Choice Question and Answer (MCQs) have been compiled from the books of Data Communication and Networking by The well known author behrouz A forouzan.

1. Data and signal MCQs.
2. Amplitude, frequency, and phase MCQs.
3. Time-domain graph plots MCQs.
4. Frequency-domain graph plots MCQs.
5. Spectrum ,bandwidth of a signa MCQs.
6. Bit rate (number of bits per second) and bit interval (duration of 1 bit) MCQs.
7. Nyquist formula MCQs.
8. Shannon capacity MCQs.
9. Attenuation, distortion, and noise MCQs.
10. Throughput, propagation speed, and propagation time ,wavelength of a frequency MCQs.

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

#### 1. Before data can be transmitted, they must be transformed to ________.

• periodic signals
• electromagnetic signals
• aperiodic signals
• low-frequency sine waves

• 1 Hz
• 100 Hz
• 1 KHz
• 1 MHz

#### 3. In a frequency-domain plot, the horizontal axis measures the ________.

• peak amplitude
• frequency
• phase
• slope

#### 4. In a time-domain plot, the horizontal axis is a measure of ________.

• signal amplitude
• frequency
• phase
• time

• 5 KHz
• 10 KHz
• 47 KHz
• 57 KHz

#### 6. What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?

• 4 MHz
• 1 KHz
• 3 MHz
• none of the above

#### 7. As frequency increases, the period ________.

• decreases
• increases
• remains the same
• doubles

#### 8. Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.

• one-half
• twice
• the same as
• indeterminate from

#### 9. A sine wave is ________.

• periodic and continuous
• aperiodic and continuous
• periodic and discrete
• aperiodic and discrete

#### 10. If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.

• 2
• 1
• -2
• between -2 and 2

#### 11. A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.

• P2 is zero
• P2 equals P1
• P2 is much larger than P1
• P2 is much smaller than P1

• Attenuation
• Distortion
• Noise
• Decibel

• Attenuation
• Distortion
• Noise
• Decibel

• Attenuation
• Distortion
• Noise
• Decibel

#### 15. When propagation speed is multiplied by propagation time, we get the ________.

• throughput
• wavelength of the signal
• distortion factor
• distance a signal or bit has traveled

#### 16. Data can be ________.

• analog
• digital
• (a) or (b)
• none of the above

#### 17. _______ data are continuous and take continuous values.

• analog
• digital
• (a) or (b)
• none of the above

#### 18. _______ data have discrete states and take discrete values.

• Analog
• Digital
• (a) or (b)
• None of the above

#### 19. Signals can be ________

• analog
• digital
• either (a) or (b)
• neither (a) nor (b)

#### 20. _____ signals can have an infinite number of values in a range.

• Analog
• Digital
• (a) or (b)
• None of the above

#### 21. _______ signals can have only a limited number of values.

• Analog
• Digital
• (a) or (b)
• None of the above

#### 22. Frequency and period are ______

• inverse of each other
• proportional to each other
• the same
• none of the above

• Amplitude
• Time
• Frequency
• Voltage

• Frequency
• Phase
• Amplitude
• Voltage

#### 25. A sine wave in the ______ domain can be represented by one single spike in the _____ domain.

• time; frequency
• frequency; time
• time; phase
• phase; time

#### 26. A _________ sine wave is not useful in data communications; we need to send a _______ signal.

• composite; single-frequency
• single-frequency; composite
• single-frequency; double-frequency
• none of the above

• frequency
• period
• bandwidth
• amplitude

#### 28. A(n)_________ signal is a composite analog signal with an infinite bandwidth.

• digital
• analog
• either (a) or (b)
• neither (a) nor (b)

• low-pass
• bandpass
• low rate
• high rate

• low-pass
• bandpass
• low rate
• high rate
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