laboursonline – MCQs, Mock Tests | Computer Hardware and Networking NETWORKING /PHYSICAL LAYER SET 4

If signal does not change at all, its frequency is

1. Zero
2. Maximum
3. Infinite
4. None of the above

✅ Correct Answer: 1

A period of 100 ms in microseconds would be equals to

1. 103us
2. 105us
3. 107us
4. 109us

✅ Correct Answer: 2

Analog data refers to information that is

1. Discrete state
2. Continuous state
3. Randomly arranged
4. None of the above

✅ Correct Answer: 2

We send a voice signal from a microphone to a recorder, the transmission is

1. Base band transmission
2. Broad band transmission
3. both a and b
4. None of the above

✅ Correct Answer: 1

The unit that is used to express the state of a signal is

1. Kilograms
2. Seconds
3. Decibel
4. Hertz

✅ Correct Answer: 3

The data rate depends upon

1. Bandwidth
2. Level of signals
3. Level of noise
4. All of the above

✅ Correct Answer: 4

Bit rate is measured in

1. Bits per Hertz
2. Bits Per Second
3. Nano seconds
4. Pixels per second

✅ Correct Answer: 2

Periodic analog signals can be classified as

1. Simple analog signal
2. Composite analog signal
3. Multiple Sine waves
4. All of the above

✅ Correct Answer: 4

Digital data refers to the information that is

1. Continuous
2. Discrete
3. Bits
4. Bytes

✅ Correct Answer: 2

Conversion of digital signal to analog signal is

1. Modulation
2. Demodulation
3. Encapsulation
4. Bypass

✅ Correct Answer: 1

A sine wave is defined by

1. amplitude
2. frequency
3. Phase
4. All of the above

✅ Correct Answer: 4

A digital signal is a composite analog signal with

1. finite bandwidth
2. Infinite bandwidth
3. zero bandwidth
4. None of the above

✅ Correct Answer: 2

Digital signals are represented in

1. Sine Waves
2. Levels
3. Stages
4. None of the above

✅ Correct Answer: 2

In data communications, the non periodic signals

1. Sine wave
2. Digital Signals
3. Analog Signals
4. None of the above

✅ Correct Answer: 4

The term that refers to loss of strength of a signal is called

1. attenuation
2. distortion
3. Noise
4. Impairments

✅ Correct Answer: 1

The value of the decibel is positive, if signal is

1. Attenuated
2. Distorted
3. Noisy
4. Amplified

✅ Correct Answer: 4

The term that describes the position of the waveform relative to time 0 is

1. Wavelength
2. Period
3. Frequency
4. Phase

✅ Correct Answer: 4

Bit Rate is the number of bits sent in

1. 1sec
2. 2sec
3. 10sec
4. 100sec

✅ Correct Answer: 1

In baseband transmission, the required bit rate is proportional to the

1. Wavelength
2. frequency
3. Period
4. Bandwidth

✅ Correct Answer: 4

Change over a long span of time means

1. High Frequency
2. Low Frequency
3. High Phase
4. Low phase

✅ Correct Answer: 2

The propagation speed of electromagnetic signals depends on the

1. medium
2. Period
3. Phase
4. delay

✅ Correct Answer: 1

The transmission impairment that refers to a signal with high energy in a very short time is

1. Thermal Noise
2. Induced Noise
3. Cross talk
4. Impulse Noise

✅ Correct Answer: 4

Bit length can be defined in terms of

1. high and low frequency
2. Propagation Speed
3. Bit duration
4. both b and c

✅ Correct Answer: 3

If a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels the maximum Bit rate would be

1. 12000 bps
2. 6000 bps
3. 1800bps
4. zero

✅ Correct Answer: 2

Sine wave can be represented by three parameters

1. peak amplitude, frequency and bandwidth
2. Frequency, phase and bandwidth
3. Peak amplitude, frequency and Phase
4. Peak amplitude, bandwidth, Period

✅ Correct Answer: 3

The range of frequencies a channel can pass is called bandwidth in

1. Bits per second
2. Hertz
3. Kilogram
4. Nanosecond

✅ Correct Answer: 2

When there is heavy traffic on the network, the queuing time is

1. fluctuate
2. Remains same
3. increases
4. decreases

✅ Correct Answer: 3

The time required for a bit to travel from source to destination is

1. Latency
2. Propagation Time
3. Delay
4. Transmission time

✅ Correct Answer: 2

In data communications, we use periodic analog signals and

1. Periodic digital signals
2. Non periodic analog signals
3. Non periodic digital signals
4. both a and c

✅ Correct Answer: 3

The range of frequencies contained in a composite signal is its

1. Wavelength
2. Bandwidth
3. amplitude
4. Composite

✅ Correct Answer: 2

In real life, we cannot have a

1. Noisy Channel
2. Noiseless channel
3. Bandwidth of channel
4. Frequency of channel

✅ Correct Answer: 2

A transmission media can have signal impairment because of

1. Noise
2. Attenuation
3. distortion
4. All of the above

✅ Correct Answer: 4

The bandwidth of a composite signal is the difference between the highest and

1. zero frequency
2. lowest frequencies
3. two Parallel frequencies
4. None of the above

✅ Correct Answer: 2

The relationship between amplitude and frequency can be represented by

1. frequency-domain plot.
2. Time-domain plot
3. Phase Domain Plot
4. Amplitude domain Plot

✅ Correct Answer: 1

Frequency is expressed in

1. Second
2. Nanosecond
3. Hertz
4. Megahertz

✅ Correct Answer: 3

Given the frequency 24Hz the corresponding period would be c. d.

1. 87.9ms
2. 41.7ms
3. 90ms
4. 12ms

✅ Correct Answer: 2

The power in our house can be represented by

1. sine wave with a peak amplitude
2. sine wave with amplitude
3. sine wave with phase
4. sine wave with frequency

✅ Correct Answer: 1

In induced noise, the impairment is created by sources like

1. Motor & appliances
2. Power lines
3. the sending and receiving antenna
4. Motion of electrons in wire

✅ Correct Answer: 1

Data to be transmitted must be transformed into

1. Electronic signal
2. Magnetic pulses
3. Radiations
4. Electromagnetic signals

✅ Correct Answer: 4

SNR stands for

1. Shannon Noise ratio
2. Shannon Noise Relation
3. Signal Noise ratio
4. Signal Noise Relation

✅ Correct Answer: 3

SNR (signal to noise ratio) is equals to

1. Avg signal power/Avg noise power
2. Avg signal power/Avg distortion
3. Avg noise power/Attenuation
4. Avg Attenuation/Avg distortion

✅ Correct Answer: 1

One Picoseconds (PS) is equivalent to

1. 10-3 s
2. 10-6 s
3. 10-9 s
4. 10-12 s

✅ Correct Answer: 4

We cannot send the digital signal directly to the channel, when the channel is

1. bandpass
2. Bypass
3. baseband
4. Low pass

✅ Correct Answer: 1

The difference in the delay of the signal may create a difference in

1. Phase
2. Frequency
3. Period
4. Decibel

✅ Correct Answer: 1

Signal to Noise Ratio is the ratio of the two

1. Signals
2. Powers
3. Noise
4. Frequencies

✅ Correct Answer: 2

According to Fourier analysis, any composite signal is a combination of sine waves with

1. diff frequencies amplitude, and phase
2. different frequencies
3. same frequencies
4. same frequencies with amplitude and phase

✅ Correct Answer: 1

How many factors data rate limit depends on

1. one
2. two
3. four
4. three

✅ Correct Answer: 4

If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth?

1. 2500 Hz
2. 900 Hz
3. 800 Hz
4. can’t be determined with the information given

✅ Correct Answer: 3

Assume we need to download text documents at the rate of 100 pages per second. What is the required bit rate of the channel?

1. 1.846 Mbps
2. 1.536 Mbps
3. 2.4 Mbps
4. None of the Mentioned

✅ Correct Answer: 2

A digitized voice channel is made by digitizing a 4-kHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate?

1. 64 kbps
2. 32 kbps
3. 128 kbps
4. 16 kbps

✅ Correct Answer: 1