Computer Hardware and Networking/NETWORKING /PHYSICAL LAYER SET 4 Sample Test,Sample questions

Question:
	
A period of 100 ms in microseconds would be equals to

1.103us

2.105us

3.107us

4.109us


Question:
	
A sine wave is defined by

1.amplitude

2.frequency

3.Phase

4.All of the above


Question:
	
Data to be transmitted must be transformed into

1.Electronic signal

2.Magnetic pulses

3.Radiations

4.Electromagnetic signals


Question:
	
Digital signals are represented in

1.Sine Waves

2.Levels

3.Stages

4.None of the above


Question:
	
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


Question:
	
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


Question:
	
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


Question:
	
The propagation speed of electromagnetic signals depends on the

1.medium

2.Period

3.Phase

4.delay


Question:
A digital signal is a composite analog signal with

1.finite bandwidth

2.Infinite bandwidth

3. zero bandwidth

4. None of the above


Question:
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


Question:
A transmission media can have signal impairment because of

1.Noise

2.Attenuation

3.distortion

4.All of the above


Question:
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


Question:
Analog data refers to information that is

1.Discrete state

2.Continuous state

3.Randomly arranged

4.None of the above


Question:
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


Question:
Bit length can be defined in terms of

1.high and low frequency

2.Propagation Speed

3.Bit duration

4.both b and c


Question:
Bit rate is measured in

1.Bits per Hertz

2.Bits Per Second

3.Nano seconds

4.Pixels per second


Question:
Bit Rate is the number of bits sent in

1.1sec

2.2sec

3.10sec

4.100sec


Question:
Change over a long span of time means

1.High Frequency

2.Low Frequency

3.High Phase

4.Low phase


Question:
Conversion of digital signal to analog signal is

1.Modulation

2.Demodulation

3.Encapsulation

4.Bypass


Question:
Digital data refers to the information that is

1.Continuous

2.Discrete

3.Bits

4.Bytes


Question:
Frequency is expressed in

1.Second

2.Nanosecond

3.Hertz

4.Megahertz


Question:
Given the frequency 24Hz the corresponding period would be

c.	

d.	

1.87.9ms

2.41.7ms

3.90ms

4.12ms


Question:
How many factors data rate limit depends on

1.one

2.two

3.four

4.three


Question:
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


Question:
If signal does not change at all, its frequency is

1.Zero

2.Maximum

3.Infinite

4.None of the above


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

1.Wavelength

2.frequency

3.Period

4.Bandwidth


Question:
In data communications, the non periodic signals

1.Sine wave

2.Digital Signals

3.Analog Signals

4.None of the above


Question:
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


Question:
In real life, we cannot have a

1.Noisy Channel

2.Noiseless channel

3.Bandwidth of channel

4.Frequency of channel


Question:
One Picoseconds (PS) is equivalent to

1.10-3 s

2.10-6 s

3.10-9 s

4.10-12 s


Question:
Periodic analog signals can be classified as

1.Simple analog signal

2.Composite analog signal

3.Multiple Sine waves

4.All of the above


Question:
Signal to Noise Ratio is the ratio of the two

1.Signals

2.Powers

3.Noise

4.Frequencies


Question:
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


Question:
SNR stands for

1.Shannon Noise ratio

2.Shannon Noise Relation

3.Signal Noise ratio

4.Signal Noise Relation


Question:
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


Question:
The data rate depends upon

1.Bandwidth

2.Level of signals

3.Level of noise

4.All of the above


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

1.Phase

2.Frequency

3.Period

4.Decibel


Question:
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


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

1.Bits per second

2.Hertz

3.Kilogram

4.Nanosecond


Question:
The range of frequencies contained in a composite signal is its

1.Wavelength

2.Bandwidth

3.amplitude

4.Composite


Question:
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


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

1.Wavelength

2.Period

3.Frequency

4.Phase


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

1.attenuation

2.distortion

3.Noise

4.Impairments


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

1.Latency

2.Propagation Time

3.Delay

4.Transmission time


Question:
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


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

1.Kilograms

2.Seconds

3.Decibel

4.Hertz


Question:
The value of the decibel is positive, if signal is

1.Attenuated

2.Distorted

3.Noisy

4.Amplified


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

1.bandpass

2.Bypass

3.baseband

4.Low pass


Question:
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


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

1.fluctuate

2.Remains same

3.increases

4.decreases


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