| 1. | Which transmission media has the highest transmission speed in a network? |
| a. | coaxial cable |
| b. | twisted pair cable |
| c. | optical fiber |
| d. | electrical cable |
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Answer: (c).optical fiber
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| 2. | Bits can be send over guided and unguided media as analog signal by |
| a. | digital modulation |
| b. | amplitude modulation |
| c. | frequency modulation |
| d. | phase modulation |
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|
Answer: (a).digital modulation
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| 3. | Which data communication method is used to transmit the data over a serial communication link? |
| a. | Simplex |
| b. | Half-duplex |
| c. | Full duplex |
| d. | All of above |
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|
Answer: (c).Full duplex
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| 4. | The method of communication in which transaction takes place in both directions,but only in one direction at a time, is called ? |
| a. | Simplex |
| b. | Four wire circuit |
| c. | Full duplex |
| d. | Half-duplex |
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|
Answer: (d).Half-duplex
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| 5. | In communication satellite, multiple repeaters are known as? |
| a. | Detectors |
| b. | Modulators |
| c. | Stations |
| d. | Transponders |
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|
Answer: (d).Transponders
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| 6. | Loss in signal power as light travels down the fiber is called? |
| a. | Attenuation |
| b. | Propagation |
| c. | Scattering |
| d. | Interruption |
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|
Answer: (a).Attenuation
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| 7. | Which of the following devices modulates digital signals into analog signals that can be sent over traditional telephone lines? |
| a. | Router |
| b. | Gateway |
| c. | Switch |
| d. | Modem |
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|
Answer: (d).Modem
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| 8. | Which of the following performs modulation and demodulation? |
| a. | fiber optics |
| b. | switch |
| c. | modulator |
| d. | modem |
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|
Answer: (d).modem
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| 9. | The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as |
| a. | modulation |
| b. | demodulation |
| c. | synchronizing |
| d. | digitising |
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Answer: (d).digitising
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| 10. | Which of the following communication modes support two-way traffic but in only one direction at a time? |
| a. | simplex |
| b. | half duplex |
| c. | three-quarters duplex |
| d. | none of the above |
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|
Answer: (b).half duplex
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