WorksheetsDCCN-Chapt-2 - Quiz
Total questions: 40
Worksheet time: 30mins
Name
Class
Date
1.
What is the key difference between analog and digital data?
a)
Digital data is always periodic
b)
Analog data is stored as 0s and 1s
c)
Digital data cannot be transmitted over a medium
d)
Analog data is continuous, while digital data has discrete states
2.
What is true for a sine wave signal?
a)
A combination of different frequencies
b)
A simple periodic analog signal that cannot be decomposed further
c)
A signal that is always digital
d)
A non-periodic analog signal
3.
How is frequency defined in relation to period?
a)
Frequency is the inverse of period
b)
Frequency and period are independent of each other
c)
Period is the square of frequency
d)
Frequency is always greater than period
4.
What is the unit of frequency in the SI system?
a)
Hertz
b)
Volt
c)
Newton
d)
Ohm
5.
How is phase measured in signal analysis?
a)
In meters or centimeters
b)
In hertz or seconds
c)
In volts or amperes
d)
In degrees or radians
6.
What happens when a signal does not change at all over time?
a)
It has zero frequency
b)
It has an infinite frequency
c)
It has a frequency of 1 Hz
d)
It does not exist as a signal
7.
What does a frequency-domain plot primarily show?
a)
Changes in signal amplitude over time
b)
Relationship between amplitude and frequency
c)
Relationship between phase and period
d)
The number of data packets in transmission
8.
What is wavelength dependent on?
a)
Only the signal frequency
b)
Only the propagation speed of the medium
c)
Both the frequency and propagation speed of the medium
d)
The amplitude of the signal
9.
How is the propagation speed of electromagnetic signals affected?
a)
It decreases in air and further decreases in cables
b)
It remains constant in all mediums
c)
It increases in optical fiber
d)
It does not depend on the medium
10.
What type of signal is made up of multiple sine waves with different frequencies, amplitudes, and phases?
a)
Digital Signal
b)
Composite Signal
c)
Analog Signal
d)
Modulated Signal
11.
What is the bandwidth of a composite signal containing frequencies between 2000 Hz and 7000 Hz?
a)
2000 Hz
b)
7000 Hz
c)
5000 Hz
d)
9000 Hz
12.
In digital transmission, how many bits can be sent per level if a signal has 4 levels?
a)
1 bit
b)
2 bits
c)
3 bits
d)
4 bits
13.
What is the key characteristic of baseband transmission?
a)
It modulates digital signals
b)
It uses a bandpass channel
c)
It sends digital signals without conversion
d)
It requires infinite bandwidth
14.
In broadband transmission, what is used to convert digital signals to analog?
a)
Modulation
b)
Fourier Transform
c)
Attenuation
d)
Distortion
15.
What does attenuation cause in signal transmission?
a)
Increase in signal power
b)
Loss of energy
c)
Change in signal shape
d)
Increase in bandwidth
16.
What is the unit used to measure the relative strength of signals?
a)
Hertz
b)
Joule
c)
Decibel
d)
Volt
17.
What does Signal-to-Noise Ratio (SNR) represent?
a)
The ratio of signal power to noise power
b)
The ratio of bandwidth to frequency
c)
The number of bits per level
d)
The difference between bit rate and baud rate
18.
What does the Nyquist Bit Rate formula calculate?
a)
Maximum data rate of a noisy channel
b)
Minimum data rate of a noiseless channel
c)
Maximum data rate of a noiseless channel
d)
Minimum data rate of a noisy channel
19.
What is the main limitation of increasing signal levels to achieve higher bit rate?
a)
It requires more bandwidth
b)
It makes receiver differentiation difficult
c)
It increases the transmission speed
d)
It reduces the number of bits transmitted
20.
According to Shannon’s capacity formula, what factor does NOT affect channel capacity?
a)
Bandwidth
b)
Signal-to-noise ratio
c)
Signal levels
d)
Noise level
21.
What is the primary measure of how fast we can actually send data through a network?
a)
Throughput
b)
Latency
c)
Bandwidth
d)
Jitter
22.
Which of the following best describes latency?
a)
Total bandwidth available in a system
b)
Difference in delay experienced by different packets
c)
Maximum achievable data rate of a network
d)
Time taken for a bit to travel from source to destination
23.
What is the main factor that affects propagation time?
a)
Signal frequency
b)
Network congestion
c)
Distance and propagation speed
d)
Bandwidth availability
24.
Transmission time is dependent on which two factors?
a)
Propagation speed and queuing time
b)
Message size and bandwidth
c)
Jitter and latency
d)
Distance and noise
25.
What is jitter in a network?
a)
The maximum data rate a network can support
b)
A measure of network congestion
c)
Time taken for a signal to propagate
d)
Variation in delay of packets
26.
Which of the following statements about bandwidth is true?
a)
It only refers to frequency range in hertz
b)
It can be measured in both hertz and bits per second
c)
It is independent of network performance
d)
It is not affected by noise
27.
What happens when network traffic increases?
a)
Queuing time decreases
b)
Latency remains constant
c)
Throughput increases
d)
Queuing time increases
28.
What is the primary purpose of line coding in digital transmission?
a)
Converting digital data into digital signals
b)
Error correction
c)
Modulation of analog signals
d)
Noise reduction
29.
In block coding, what is the purpose of adding redundancy?
a)
To increase data rate
b)
For synchronization and error detection
c)
To decrease bandwidth usage
d)
To enhance modulation
30.
Which step in PCM involves approximating sampled values to the nearest predefined level?
a)
Sampling
b)
Encoding
c)
Quantization
d)
Modulation
31.
What is the minimum sampling rate required in PCM to avoid aliasing according to Nyquist-Shannon theorem?
a)
Equal to the highest frequency of the analog signal
b)
Twice the highest frequency of the analog signal
c)
Half the highest frequency of the analog signal
d)
Any arbitrary sampling rate
32.
According to Nyquist’s theorem, what is the minimum sampling rate required for a signal with a maximum frequency of 5 kHz?
a)
5 kHz
b)
10 kHz
c)
15 kHz
d)
20 kHz
33.
Which transmission method does NOT involve modulation?
a)
Bandpass transmission
b)
Baseband transmission
c)
Amplitude Shift Keying (ASK)
d)
Frequency Shift Keying (FSK)
34.
Which modulation technique varies the amplitude of the carrier signal?
a)
Frequency Shift Keying (FSK)
b)
Phase Shift Keying (PSK)
c)
Amplitude Shift Keying (ASK)
d)
Quadrature Amplitude Modulation (QAM)
35.
In Binary Frequency Shift Keying (BFSK), what is varied to represent digital data?
a)
Amplitude
b)
Frequency
c)
Phase
d)
Voltage
36.
What is a major drawback of baseband transmission?
a)
Requires complex modulation
b)
Limited bandwidth
c)
High power consumption
d)
Poor performance over long distances
37.
In digital-to-analog conversion, if the baud rate is 2400 and each signal unit carries 2 bits, what is the bit rate?
a)
2400 bps
b)
4800 bps
c)
1200 bps
d)
9600 bps
38.
In QAM, which two signal characteristics are varied simultaneously?
a)
Frequency and Amplitude
b)
Frequency and Time
c)
Phase and Frequency
d)
Amplitude and Phase
39.
A modem is primarily used for which of the following functions?
a)
Converting digital signals to analog and vice versa
b)
Multiplexing data streams
c)
Enhancing bandwidth
d)
Encrypting transmitted data
40.
Which type of modem is used for high-speed internet via telephone lines?
a)
Dial-up modem
b)
DSL modem
c)
Fiber-optic modem
d)
Cable modem
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