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Quiz no 3

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1) The time taken by a data signal to reach to moon and then back to earth was about:

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2) Which type of modem can be added to the system unit through expansion slot?

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3) Which communications medium requires line-of-sight?

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4) An example of non-numerical data is:

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5) Which of the following consists of thin glass to transmit beams of light?

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6) code is 7-bit or.8-bit code.

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7) Start/stop bits are not required in this type of transmission.

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8) An advantage of synchronous over asynchronous transmission is:

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9) BCD code is a_

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10) .Which transmission type transmits data one character at a time

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11) ASCII code was.developed by:

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12) Satellite transmission stations that can both send and receive messages are called:

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13) The transmission rate of modem can be measured in:

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14) Which of the following consists of two insulated copper wires twisted together?

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15) Which of the following converts digital signals to analog and analog to digital?

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16) Select unguided media from the following:

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17) Internet surfing is an example of:

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18) The signals produced by a computer to send over phone line must be converted to:

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19) Bps is short for:

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20) An important property of fiber optic cable is:

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21) Transmission that is used without timing signal is called:

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22) 50.This type of transmission is sometimes called start/stop transmission

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23) Which of the following type of data is used to display actions and movement?.

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24) Unicode uses:

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25) A modem allows computers to access other computers through following types of connection

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26) Which kind of signal is mostly required by telephone lines?

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27) Analog signal is measured in:

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28) What binary bits are used to encode digital data?

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29) The process of converting analog to digital signal is known as:

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30) The diameter of fiber optical cable is:

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31) Which of the following can severally affect the quality of satellite transmission?

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32) Computer transmit data in the form of codes.

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33) Digital signals are commonly known as:

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34) The conversation over a walkie-talkie radio is-an example of:

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35) The number of times a wave repeats during a specific time interval is called

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36) What is another term for guided media?

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37) Transmission from a satellite to its earth-based station is called:

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38) A fiber-optic cable’s core is measured in:

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39) How many characters ASCII 7-bit code can represent?

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40) Digital signal represents a sequence of values.

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41) Which is the most secure type of transmission medium?

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42) Which medium transmits voice and data via air as high-frequency radio waves?

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43) Which type of data consists of words,sentences and paragraphs?

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44) signal is a continuous electrical signal in the form of wave.

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45) All of the following are guided communications media EXCEPT:

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46) Which of the following code can represent up to 65,536 symbols?

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47) How many characters can Unicode represcnt?

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48) Modem stands for:

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49) Sound,light and radio waves are examples of

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50) The process of converting a digital signal to an analog signal is called:

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51) What is another term for unguided media?

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52) A type of communication that sends that uses a clock to control timing of bits being sent is called:

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53) Which communication technique can transmit the data over long distance?

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54) Which of the following coding schemes primarily.used by IBM?

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55) The process of transferring data electronically from one place to another is caled

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56) Physical path that connects the source and receiver is known as:

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57) Television and radio broadcasts are examples of:

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58) The internal transfer of binary data in a computer uses mode.

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59) All of the following are elements of data communication system EXCEPT:

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60) The electromagnetic or light waves representing data are called:

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61) Which of the following devices uses parallel transmission?

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62) EBCDIC is a

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63) The number of times a wave repeats during a specific time interval is called

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64) Which of the following is not a communication media?

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65) The typical fiber optic cable consists of very narrow strand of glass called:

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66) IBM stands for:

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67) BCD stands for:

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68) The medium in which signals travel through a cable or wire is called:

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69) A type of communication that sends data using flow control to synchronize data between sender

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70) Which of the following is the insulation on a fiber-optic cable?

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71) The types.of signals can be:

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72) Which multiplexing technique shifts each signal to a different carrier frequency?

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73) Which of the following transmission media is used in LAN?

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74) The mode that is like a two way street with traffic flowing in both direction at the.same time is ca

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75) The’transmission in which data can be received and. sent simultaneously is called:

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76) Which modem is used to transmit data signals through air instead of cable?

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77) The height of wave within a given period of time is known as:

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78) Most data .transmitted over telephone lines uses:.

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79) Which of the following technique uses modulation?

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80) How many characters ASCII 8-bit code can represent?

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81) Frequency is measured in:

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82) .The conversation over a walkie-talkie radio is-an example of:

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83) The number of frequencies that can fit on a link at one time is called:

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84) Which transmission allows data to travel in one direction at a time?

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85) The communication channels can be divided into_categories:

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86) Which of the following coding schemes uses 4-bit code?

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87) The music and speech.represent:

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88) Each set of bit pattern is called:

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89) The computers in wide geographical area can be efficiently connected by:

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90) Which value in start bit indicates that the transmission line is idle?

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91) Which of the following cables consists of a single core of solid copper?

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92) How many devices can exist between a sending and receiving host?

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93) How many modes of data communication are available?

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94) Which of the following features is provided with a modem?

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95) Full-duplex communication is made. possible by the.devices known as:

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96) A telephone conversation is’an example of:.

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97) Transmission media are usually categorized as_

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98) Data is transmitted block by block in: .

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99) Which of the following is not a:data communication mode?

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100) Which of the following is the fastest communication mode