MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
_____ signals can have an infinite number of values in a range. |
| A. | Analog |
| B. | Digital |
| C. | (a) or (b) |
| D. | None of the above |
| Answer» B. Digital | |
| 2. |
A sine wave in the ______ domain can be represented by one single spike in the _____ domain. |
| A. | time; frequency |
| B. | frequency; time |
| C. | time; phase |
| D. | phase; time |
| Answer» B. frequency; time | |
| 3. |
Data can be ________. |
| A. | analog |
| B. | digital |
| C. | (a) or (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 4. |
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 ________. |
| A. | P2 is zero |
| B. | P2 equals P1 |
| C. | P2 is much larger than P1 |
| D. | P2 is much smaller than P1 |
| Answer» C. P2 is much larger than P1 | |
| 5. |
________is the rate of change with respect to time. |
| A. | Amplitude |
| B. | Time |
| C. | Frequency |
| D. | Voltage |
| Answer» D. Voltage | |
| 6. |
________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. |
| A. | Attenuation |
| B. | Distortion |
| C. | Noise |
| D. | Decibel |
| Answer» B. Distortion | |
| 7. |
As frequency increases, the period ________. |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | doubles |
| Answer» B. increases | |
| 8. |
A sine wave is ________. |
| A. | periodic and continuous |
| B. | aperiodic and continuous |
| C. | periodic and discrete |
| D. | aperiodic and discrete |
| Answer» B. aperiodic and continuous | |
| 9. |
What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz? |
| A. | 4 MHz |
| B. | 1 KHz |
| C. | 3 MHz |
| D. | none of the above |
| Answer» D. none of the above | |
| 10. |
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. |
| A. | one-half |
| B. | twice |
| C. | the same as |
| D. | indeterminate from |
| Answer» C. the same as | |
| 11. |
________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal. |
| A. | Attenuation |
| B. | Distortion |
| C. | Noise |
| D. | Decibel |
| Answer» D. Decibel | |
| 12. |
________ 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. |
| A. | Attenuation |
| B. | Distortion |
| C. | Noise |
| D. | Decibel |
| Answer» C. Noise | |
| 13. |
___________ conversion involves three techniques: line coding, block coding, and scrambling. |
| A. | Analog-to-digital |
| B. | Digital-to-analog |
| C. | Analog-to-analog |
| D. | Digital-to-digital |
| Answer» E. | |
| 14. |
How many carrier frequencies are used in QPSK? |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | none of the above |
| Answer» B. 1 | |
| 15. |
If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V. |
| A. | 2 |
| B. | 1 |
| C. | -2 |
| D. | between -2 and 2 |
| Answer» D. between -2 and 2 | |
| 16. |
Which of the following layer decide the transmission rate in a Network? |
| A. | Physical layer |
| B. | Data link layer |
| C. | Network layer |
| D. | Transport layer |
| Answer» B. Data link layer | |
| 17. |
What is the main function of DSLAM? |
| A. | Convert analog signal into digital signal |
| B. | Covert digital signal into analog |
| C. | Used in router to detect the loss packets |
| D. | None of the above |
| Answer» B. Covert digital signal into analog | |
| 18. |
In _____ transmission, the carrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal. |
| A. | AM |
| B. | PM |
| C. | FM |
| D. | none of the above |
| Answer» B. PM | |
| 19. |
How many factors data rate limit depends on |
| A. | One |
| B. | two |
| C. | four |
| D. | three |
| Answer» E. | |
| 20. |
The unit that is used to express the state of a signal is |
| A. | Kilograms |
| B. | Seconds |
| C. | Decibel |
| D. | Hertz |
| Answer» D. Hertz | |
| 21. |
If signal does not change at all, its frequency is |
| A. | Zero |
| B. | Maximum |
| C. | Infinite |
| D. | None of Above |
| Answer» B. Maximum | |
| 22. |
The data rate depends upon |
| A. | Bandwidth |
| B. | Level of signals |
| C. | Level of noise |
| D. | All of the above |
| Answer» E. | |
| 23. |
Periodic analog signals can be classified as |
| A. | Simple analog signal |
| B. | Composite analog signal |
| C. | Multiple Sine waves |
| D. | All of the of Above |
| Answer» E. | |
| 24. |
If a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels the maximum Bit rate would be |
| A. | 12000 bps |
| B. | 6000 bps |
| C. | 1800bps |
| D. | zero |
| Answer» C. 1800bps | |
| 25. |
The data rate is sometimes called the ___ rate. |
| A. | baud |
| B. | bit |
| C. | signal |
| D. | none of the above |
| Answer» C. signal | |
| 26. |
There are three sampling methods: __________. |
| A. | quantized, sampled, and ideal |
| B. | ideal, sampled, and flat-top |
| C. | ideal, natural, and flat-top |
| D. | none of the above |
| Answer» D. none of the above | |
| 27. |
Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address? |
| A. | Hub |
| B. | Switch |
| C. | Gateway |
| D. | Modem |
| Answer» C. Gateway | |
| 28. |
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? |
| A. | DNS Server |
| B. | Switch |
| C. | Hub |
| D. | Gateway |
| Answer» D. Gateway | |
| 29. |
Baud means? |
| A. | The number of bits transmitted per unit time |
| B. | The number of byted transmitted per unit time |
| C. | The rate at which the signal changes |
| D. | None of above |
| Answer» D. None of above | |
| 30. |
The _________ product defines the number of bits that can fill the link. |
| A. | bandwidth-period |
| B. | frequency-amplitude |
| C. | bandwidth-delay |
| D. | delay-amplitude |
| Answer» D. delay-amplitude | |
| 31. |
For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate. |
| A. | noisy |
| B. | noiseless |
| C. | bandpass |
| D. | low-pass |
| Answer» B. noiseless | |
| 32. |
Baseband transmission of a digital signal is possible only if we have a ____ channel. |
| A. | low-pass |
| B. | bandpass |
| C. | low rate |
| D. | high rate |
| Answer» B. bandpass | |
| 33. |
A(n)_________ signal is a composite analog signal with an infinite bandwidth. |
| A. | digital |
| B. | analog |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. analog | |
| 34. |
The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal. |
| A. | frequency |
| B. | period |
| C. | bandwidth |
| D. | amplitude |
| Answer» D. amplitude | |
| 35. |
For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate. |
| A. | noisy |
| B. | noiseless |
| C. | bandpass |
| D. | low-pass |
| Answer» C. bandpass | |
| 36. |
If the available channel is a ____ channel, we cannot send a digital signal directly to the channel. |
| A. | low-pass |
| B. | bandpass |
| C. | low rate |
| D. | high rate |
| Answer» C. low rate | |
| 37. |
A _________ sine wave is not useful in data communications; we need to send a _______ signal. |
| A. | composite; single-frequency |
| B. | single-frequency; composite |
| C. | single-frequency; double-frequency |
| D. | none of the above |
| Answer» C. single-frequency; double-frequency | |
| 38. |
_________ can impair a signal. |
| A. | Attenuation |
| B. | Distortion |
| C. | Noise |
| D. | All of the above |
| Answer» E. | |
| 39. |
The constellation diagram of BPSK has ______ dots. |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | none of the above |
| Answer» B. 1 | |
| 40. |
The most common technique to change an analog signal to digital data is called __________. |
| A. | PAL |
| B. | PCM |
| C. | sampling |
| D. | none of the above |
| Answer» C. sampling | |
| 41. |
MAC address is also known as __________. |
| A. | Hardware address |
| B. | Physical address |
| C. | IP address |
| D. | both and b above |
| Answer» E. | |
| 42. |
_______ data are continuous and take continuous values. |
| A. | analog |
| B. | digital |
| C. | (a) or (b) |
| D. | none of the above |
| Answer» B. digital | |
| 43. |
The ________ mode provides synchronization for the entire stream of bits must. In other words, it guarantees that the data arrive at a fixed rate. |
| A. | synchronous |
| B. | asynchronous |
| C. | isochronous |
| D. | none of the above |
| Answer» D. none of the above | |
| 44. |
In _________, the frequency of the carrier signal is varied to represent data. Both peak amplitude and phase remain constant. |
| A. | ASK |
| B. | PSK |
| C. | FSK |
| D. | QAM |
| Answer» D. QAM | |
| 45. |
The Federal Communications Commission (FCC) allows ______kHz for each AM station. |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | none of the above |
| Answer» C. 20 | |
| 46. |
In induced noise, the impairment is created by sources like |
| A. | Motor & appliances |
| B. | Power lines |
| C. | the sending and receiving antenna |
| D. | Motion of electrons in wire |
| Answer» B. Power lines | |
| 47. |
Bit Rate is the number of bits sent in |
| A. | 1sec |
| B. | 2sec |
| C. | 10sec |
| D. | 100sec |
| Answer» B. 2sec | |
| 48. |
A sine wave is defined by |
| A. | amplitude |
| B. | frequency |
| C. | Phase |
| D. | All of the above |
| Answer» E. | |
| 49. |
_______ encoding has a transition at the middle of each bit. |
| A. | RZ |
| B. | Manchester |
| C. | Differential Manchester |
| D. | All the above |
| Answer» E. | |
| 50. |
which of the following devices is used to connect different network segments and manage the traffic between them? |
| A. | Bridge |
| B. | Hub |
| C. | Gateway |
| D. | Repeater |
| Answer» B. Hub | |