# Computer Hardware and Networking/NETWORKING /PHYSICAL LAYER SET 1 Sample Test,Sample questions

## Question: ``` A sine wave is ________.```

1.periodic and continuous

2.aperiodic and continuous

3.periodic and discrete

4.aperiodic and discrete

Posted Date:-2022-06-17 11:44:15

## Question: ``` A _________ sine wave is not useful in data communications; we need to send a _______ signal```

1.composite; single-frequency

2.single-frequency; composite

3.single-frequency; double-frequency

4.none of the above

Posted Date:-2022-06-17 12:34:37

## Question: ``` For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate. ```

1.noisy

2.noiseless

3.bandpass

4.low-pass

Posted Date:-2022-06-17 12:40:05

## Question: ``` For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate. ```

1.noisy

2.noiseless

3.bandpass

4.low-pass

Posted Date:-2022-06-17 12:41:23

## Question: ``` If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?```

1. 5 KHz

2.10 KHz

3.47 KHz

4. 57 KHz

Posted Date:-2022-06-17 11:29:13

## Question: ``` If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?```

1. 5 KHz

2.10 KHz

3.47 KHz

4. 57 KHz

Posted Date:-2022-06-17 11:29:14

## Question: ``` The physical layer is concerned with the movement of _______ over the physical medium.```

1.programs

2.dialogs

3.protocols

4.bits

Posted Date:-2022-06-17 11:17:15

## Question: ``` The term ......... describes the position of the waveform relative to time 0.```

1.Frequency

2.Phase

3.Phase Shift

4.Time period

Posted Date:-2022-06-17 11:24:44

## Question: ``` The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.```

1.frequency

2.period

3.bandwidth

4.amplitude

Posted Date:-2022-06-17 12:35:26

## Question: ``` The _________ product defines the number of bits that can fill the link.```

1.bandwidth-period

2. frequency-amplitude

3.bandwidth-delay

4.delay-amplitude

Posted Date:-2022-06-17 12:43:21

## Question: ``` Unipolar, bipolar, and polar encoding are types of _______ encoding. a. line b. block c. NRZ d. Unipolar, bipolar, and polar encoding are types of _______ encoding.```

1.line

2.block

3.NRZ

4. Manchester

Posted Date:-2022-06-17 12:56:53

## Question: ``` _____ signals can have an infinite number of values in a range. ```

1.Analog

2.Digital

3.(a) or (b)

4.None of the above

Posted Date:-2022-06-17 11:55:24

## Question: `A periodic signal completes one cycle in 0.001 s. What is the frequency?`

1.1 Hz

2.100 Hz

3.1 KHz

4.1 MHz

Posted Date:-2022-06-17 11:20:27

## Question: `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 ________.`

1.P2 is zero

2.P2 equals P1

3.P2 is much larger than P1

4.P2 is much smaller than P1

Posted Date:-2022-06-17 11:45:54

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

1.time; frequency

2.frequency; time

3.time; phase

4. phase; time

Posted Date:-2022-06-17 12:33:16

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

1.digital

2.analog

3.either (a) or (b)

4.neither (a) nor (b)

Posted Date:-2022-06-17 12:36:25

## Question: `As frequency increases, the period ________.`

1.decreases

2.increases

3.remains the same

4.doubles

Posted Date:-2022-06-17 11:32:55

## Question: ```Baseband transmission of a digital signal is possible only if we have a ____ channel. ```

1.low-pass

2.bandpass

3.low rate

4.high rate

Posted Date:-2022-06-17 12:38:12

## Question: ```Baud means? ```

1.The number of bits transmitted per unit time

2.The number of byted transmitted per unit time

3.The rate at which the signal changes

4.None of the above

Posted Date:-2022-06-17 12:49:00

## Question: ```Before data can be transmitted, they must be transformed to ________. ```

1.periodic signals

2.electromagnetic signals

3.aperiodic signals

4.low-frequency sine waves

Posted Date:-2022-06-17 11:19:35

## Question: ```Data can be ________. d. none of the above```

1.analog

2.digital

3.(a) or (b)

4.None of the above

Posted Date:-2022-06-17 11:51:29

## Question: `Frequency and period are ______.`

1.inverse of each other

2.proportional to each other

3.the same

4.None of the above

Posted Date:-2022-06-17 12:29:25

## Question: `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.`

1.one-half

2.twice

3.the same as

4. indeterminate from

Posted Date:-2022-06-17 11:34:34

## Question: `If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.`

1. low-pass

2.bandpass

3. low rate

4.high rate

Posted Date:-2022-06-17 12:39:16

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

1.2

2.1

3.-2

4.between -2 and 2

Posted Date:-2022-06-17 11:45:00

## Question: `In a frequency-domain plot, the horizontal axis measures the ________.`

1.peak amplitude

2.frequency

3.phase

4.slope

Posted Date:-2022-06-17 11:26:12

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

1.signal amplitude

2.frequency

3.phase

4.time

Posted Date:-2022-06-17 11:27:15

## Question: ```In asynchronous serial communication the physical layer provides ```

1.start and stop signalling

2.flow control

3.both (a) and (b)

4.None of the mentioned

Posted Date:-2022-06-17 12:47:07

## Question: ```physical layer provides ```

1.mechanical specifications of electrical connectors and cables

2.electrical specification of transmission line signal level

3.specification for IR over optical fiber

4.all of the mentioned

Posted Date:-2022-06-17 12:45:47

## Question: ```Signals can be ________. ```

1.analog

2.digital

3.either (a) or (b)

4.neither (a) nor (b)

Posted Date:-2022-06-17 11:54:25

## Question: `The physical layer concerns with`

1.bit-by-bit delivery

2.process to process delivery

3.application to application delivery

4.None of the above

Posted Date:-2022-06-17 11:22:04

## Question: ```The physical layer is responsible for ```

1.line coding

2.channel coding

3.modulation

4.all of the mentioned

Posted Date:-2022-06-17 12:47:57

## Question: ```The portion of physical layer that interfaces with the media access control sublayer is called ```

1.physical signalling sublayer

2.physical data sublayer

4.none of the mentioned

Posted Date:-2022-06-17 12:44:25

## Question: `The _______ is the physical path over which a message travels.`

1.Signal

2.Protocol

3.Medium

4.All of the above

Posted Date:-2022-06-17 11:18:30

## Question: ```Unipolar, bipolar, and polar encoding are types of _______ encoding. ```

1.line

2.block

3.NRZ

4.Manchester

Posted Date:-2022-06-17 12:53:30

## Question: ```What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz? ```

1.4 MHz

2.1 KHz

3.3 MHz

4.None of the above

Posted Date:-2022-06-17 11:31:05

## Question: ```When propagation speed is multiplied by propagation time, we get the ________. ```

1.throughput

2.wavelength of the signal

3.distortion factor

4.distance a signal or bit has traveled

Posted Date:-2022-06-17 11:50:02

## Question: `which of the following devices is used to connect different network segments and manage the traffic between them?`

1.Bridge

2.Hub

3.Gateway

4.Repeater

Posted Date:-2022-06-17 12:52:29

## Question: `Which of the following devices takes data sent from one network device and forwards it to all devices on the network regardless of the intended recipient?`

1.DNS Server

2.Switch

3.Hub

4.Gateway

Posted Date:-2022-06-17 12:50:09

## Question: `Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?`

1.Hub

2.Switch

3.Gateway

4.Modem

Posted Date:-2022-06-17 12:51:26

## Question: `__ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.`

1.Attenuation

2.Distortion

3.Noise

4.Decibel

Posted Date:-2022-06-17 11:49:05

## Question: `__ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.`

1.Attenuation

2.Distortion

3.Noise

4.Decibel

Posted Date:-2022-06-17 11:48:26

## Question: ```___ describes the position of the waveform relative to time 0. ```

1.Frequency

2.Phase

3.Amplitude

4.Voltage

Posted Date:-2022-06-17 12:32:20

## Question: ```______ can impair a signal. ```

1.Attenuation

2.Distortion

3.Noise

4.All of the above

Posted Date:-2022-06-17 12:42:30

## Question: `_______ data are continuous and take continuous values.`

1.analog

2.digital

3.(a) or (b)

4.None of the above

Posted Date:-2022-06-17 11:52:40

## Question: ```_______ data have discrete states and take discrete values. ```

1.Analog

2.Digital

3.(a) or (b)

4.None of the above

Posted Date:-2022-06-17 11:53:31

## Question: `_______ encoding has a transition at the middle of each bit.`

1.RZ

2.Manchester

3.Differential Manchester

4.All of the above

Posted Date:-2022-06-17 12:55:43

## Question: `_______ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.`

1. Attenuation

2.Distortion

3.Noise

4.Decibel

Posted Date:-2022-06-17 11:47:00

## Question: ```_______ signals can have only a limited number of values. ```

1.Analog

2.Digital

3.(a) or (b)

4.None of the above

Posted Date:-2022-06-17 12:24:04

## Question: ```_______is the rate of change with respect to time. ```

1.Amplitude

2.Time

3.Frequency

4.Voltage

Posted Date:-2022-06-17 12:31:30

## More MCQS

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