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. |
The range of frequencies a channel can pass is called bandwidth in |
| A. | Bits per second |
| B. | Hertz |
| C. | Kilogram |
| D. | Nanosecond |
| Answer» C. Kilogram | |
| 2. |
________ uses two carriers, one in-phase and the other quadrature. |
| A. | ASK |
| B. | PSK |
| C. | FSK |
| D. | QAM |
| Answer» E. | |
| 3. |
_________ conversion is the representation of analog information by an analog signal. |
| A. | Digital-to-analog |
| B. | Analog-to-analog |
| C. | Analog-to-digital |
| D. | Digital-to-digital |
| Answer» C. Analog-to-digital | |
| 4. |
Signals can be ________. |
| A. | analog |
| B. | digital |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5. |
While there is (are) only _____ way(s) to send parallel data, there is (are) three subclass(es) of serial transmission. |
| A. | one; two |
| B. | two; three |
| C. | one; three |
| D. | none of the above |
| Answer» D. none of the above | |
| 6. |
In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. |
| A. | ASK |
| B. | PSK |
| C. | FSK |
| D. | QAM |
| Answer» C. FSK | |
| 7. |
Unipolar, bipolar, and polar encoding are types of _______ encoding. |
| A. | line |
| B. | block |
| C. | NRZ |
| D. | Manchester |
| Answer» B. block | |
| 8. |
Consider the below figure. What are the bits transmitted for the Unipolar system? |
| A. | 01101 |
| B. | 11010 |
| C. | 10110 |
| D. | 01001 |
| Answer» D. 01001 | |
| 9. |
Digital data refers to the information that is |
| A. | Continuous |
| B. | Discrete |
| C. | Bits |
| D. | Bytes |
| Answer» C. Bits | |
| 10. |
The bandwidth of a composite signal is the difference between the highest and |
| A. | zero frequency |
| B. | lowest frequencies |
| C. | two Parallel frequencies |
| D. | None of Above |
| Answer» C. two Parallel frequencies | |
| 11. |
Change over a long span of time means |
| A. | High Frequency |
| B. | Low Frequency |
| C. | High Phase |
| D. | Low phase |
| Answer» C. High Phase | |
| 12. |
The first step in PCM is ________. |
| A. | quantization |
| B. | modulation |
| C. | sampling |
| D. | none of the above |
| Answer» D. none of the above | |
| 13. |
When propagation speed is multiplied by propagation time, we get the ________. |
| A. | throughput |
| B. | wavelength of the signal |
| C. | distortion factor |
| D. | distance a signal or bit has traveled |
| Answer» E. | |
| 14. |
If the bit rate for an FSK signal is 1200 bps, the baud rate is ________. |
| A. | 300 |
| B. | 400 |
| C. | 600 |
| D. | 1200 |
| Answer» E. | |
| 15. |
The value of the decibel is positive, if signal is |
| A. | Attenuated |
| B. | Distorted |
| C. | Noisy |
| D. | Amplified |
| Answer» E. | |
| 16. |
If the bit rate for an ASK signal is 1200 bps, the baud rate is ________. |
| A. | 300 |
| B. | 400 |
| C. | 600 |
| D. | 1200 |
| Answer» E. | |
| 17. |
AM and FM are examples of ________ conversion. |
| A. | digital-to-digital |
| B. | digital-to-analog |
| C. | analog-to-analog |
| D. | analog-to-digital |
| Answer» D. analog-to-digital | |
| 18. |
In QAM, both ________ of a carrier frequency are varied. |
| A. | frequency and amplitude |
| B. | phase and frequency |
| C. | amplitude and phase |
| D. | none of the above |
| Answer» D. none of the above | |
| 19. |
If the baud rate is 400 for a QPSK signal, the bit rate is ________ bps. |
| A. | 100 |
| B. | 400 |
| C. | 800 |
| D. | 1600 |
| Answer» D. 1600 | |
| 20. |
______ substitutes four consecutive zeros with 000V or B00V. |
| A. | B4B8 |
| B. | HDB3 |
| C. | B8ZSf |
| D. | none of the above |
| Answer» C. B8ZSf | |
| 21. |
The _____ scheme uses data patterns of size 2 and encodes the 2-bit patterns as one signal element belonging to a four-level signal. |
| A. | 4B5B |
| B. | 2B1Q |
| C. | MLT-3 |
| D. | none of the above |
| Answer» C. MLT-3 | |
| 22. |
ASK, PSK, FSK, and QAM are examples of ________ conversion. |
| A. | digital-to-digital |
| B. | digital-to-analog |
| C. | analog-to-analog |
| D. | analog-to-digital |
| Answer» C. analog-to-analog | |
| 23. |
______ substitutes eight consecutive zeros with 000VB0VB. |
| A. | B4B8 |
| B. | HDB3 |
| C. | B8ZS |
| D. | none of the above |
| Answer» D. none of the above | |
| 24. |
The ______ scheme uses three levels (+V, 0, and -V) and three transition rules to move between the levels. |
| A. | 4B5B |
| B. | 2B1Q |
| C. | MLT-3 |
| D. | none of the above |
| Answer» D. none of the above | |
| 25. |
Quadrature amplitude modulation (QAM) is a combination of ___________. |
| A. | ASK and FSK |
| B. | ASK and PSK |
| C. | PSK and FSK |
| D. | none of the above |
| Answer» C. PSK and FSK | |
| 26. |
________ provides synchronization without increasing the number of bits. |
| A. | Scrambling encoding |
| B. | Line coding |
| C. | Block coding |
| D. | None of the above |
| Answer» B. Line coding | |
| 27. |
Repeater operates in which layer of the OSI model? |
| A. | Physical layer |
| B. | Data link layer |
| C. | Network layer |
| D. | Transport layer |
| Answer» B. Data link layer | |
| 28. |
In asynchronous transmission, the gap time between bytes is _______. |
| A. | fixed |
| B. | variable |
| C. | a function of the data rate |
| D. | zero |
| Answer» C. a function of the data rate | |
| 29. |
In _______, the peak amplitude of one signal level is 0; the other is the same as the amplitude of the carrier frequency. |
| A. | PSK |
| B. | OOK |
| C. | FSK |
| D. | none of the above |
| Answer» C. FSK | |
| 30. |
The idea of RZ and the idea of NRZ-L are combined into the ________ scheme. |
| A. | Manchester |
| B. | differential Manchester |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» B. differential Manchester | |
| 31. |
Which of the following is not an analog-to-analog conversion? |
| A. | AM |
| B. | PM |
| C. | FM |
| D. | QAM |
| Answer» E. | |
| 32. |
A channel has a 1-MHz bandwidth. The SNR for this channel is 63. What is the appropriate signel level? |
| A. | 2 |
| B. | 8 |
| C. | 4 |
| D. | 16 |
| Answer» D. 16 | |
| 33. |
When there is heavy traffic on the network, the queuing time is |
| A. | fluctuate |
| B. | Remains same |
| C. | increases |
| D. | decreases |
| Answer» D. decreases | |
| 34. |
The transmission impairment that refers to a signal with high energy in a very short time is |
| A. | Thermal Noise |
| B. | Induced Noise |
| C. | Cross talk |
| D. | Impulse Noise |
| Answer» E. | |
| 35. |
Conversion of digital signal to analog signal is |
| A. | Modulation |
| B. | Demodulation |
| C. | Encapsulation |
| D. | Bypass |
| Answer» B. Demodulation | |
| 36. |
Which of the following statements is correct? |
| A. | characteristic of LAN is unlimited expansion |
| B. | characteristic of LAN is low cost access for low bandwidth channels |
| C. | characteristic of the hub architecture of ARC-net is alternative routing |
| D. | characteristic of the hub architecture of ARC-net is directionalized transmission |
| Answer» E. | |
| 37. |
_______ describes the position of the waveform relative to time 0. |
| A. | Frequency |
| B. | Phase |
| C. | Amplitude |
| D. | Voltage |
| Answer» C. Amplitude | |
| 38. |
Bit length can be defined in terms of |
| A. | high and low frequency |
| B. | Propagation Speed |
| C. | Bit duration |
| D. | both b and c |
| Answer» D. both b and c | |
| 39. |
In a _____ scheme, all the signal levels are on one side of the time axis, either above or below. |
| A. | polar |
| B. | bipolar |
| C. | unipolar |
| D. | all of the above |
| Answer» D. all of the above | |
| 40. |
______ finds the value of the signal amplitude for each sample; ____ finds the change from the previous sample. |
| A. | DM; PCM |
| B. | PCM; DM |
| C. | DM; CM |
| D. | none of the above |
| Answer» C. DM; CM | |
| 41. |
A periodic signal completes one cycle in 0.001 s. What is the frequency? |
| A. | 1 Hz |
| B. | 100 Hz |
| C. | 1 KHz |
| D. | 1 MHz |
| Answer» D. 1 MHz | |
| 42. |
The term ......... describes the position of the waveform relative to time 0. |
| A. | Frequency |
| B. | Phase |
| C. | Phase Shift |
| D. | Time period |
| Answer» C. Phase Shift | |
| 43. |
Before data can be transmitted, they must be transformed to ________. |
| A. | periodic signals |
| B. | electromagnetic signals |
| C. | aperiodic signals |
| D. | low-frequency sine waves |
| Answer» C. aperiodic signals | |
| 44. |
The _______ is the physical path over which a message travels. |
| A. | Protocol |
| B. | Medium |
| C. | Signal |
| D. | All the above |
| Answer» C. Signal | |
| 45. |
The physical layer is concerned with the movement of _______ over the physical medium. |
| A. | programs |
| B. | dialogs |
| C. | protocols |
| D. | bits |
| Answer» E. | |
| 46. |
If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency? |
| A. | 5 KHz |
| B. | 10 KHz |
| C. | 47 KHz |
| D. | 57 KHz |
| Answer» E. | |
| 47. |
In a frequency-domain plot, the horizontal axis measures the ________. |
| A. | peak amplitude |
| B. | frequency |
| C. | phase |
| D. | slope |
| Answer» C. phase | |
| 48. |
In a time-domain plot, the horizontal axis is a measure of ________. |
| A. | signal amplitude |
| B. | frequency |
| C. | phase |
| D. | time |
| Answer» E. | |
| 49. |
A_SINGLE_CHANNEL_IS_SHARED_BY_MULTIPLE_SIGNALS_BY?$ |
| A. | analog modulation |
| B. | digital modulation |
| C. | multiplexing |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 50. |
Wireless_transmission_can_be_done_via$ |
| A. | radio waves |
| B. | microwaves |
| C. | infrared |
| D. | all of the mentioned |
| Answer» E. | |