AIOU test 5/01/2023

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

2) Digital signal represents a sequence of values.

3) Internet surfing is an example of:

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

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

6) The chart,graph,pictures and freehand drawing are examples of:

7) How many modes of data communication are available?

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

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

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

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

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

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

14) The music and speech.represent:

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

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

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

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

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

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

21) Television and radio broadcasts are examples of:

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

23) An important property of fiber optic cable is:

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

25) Which of the following is NOT a coding scheme to represent data in computer?

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

27) Data is transmitted block by block in: .

28) Modem stands for:

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

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

31) Each set of bit pattern is called:

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

33) BCD code is a_

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

35) Unicode uses:

36) The types.of signals can be:

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

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

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

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

41) The diameter of fiber optical cable is:

42) Which of the following devices uses parallel transmission?

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

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

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

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

47) Which of the following is the fastest communication mode

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

49) Select unguided media from the following:

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

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

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

53) Digital signals are commonly known as:

54) What is another term for unguided media?

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

56) How many characters can Unicode represcnt?

57) Computer transmit data in the form of codes.

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

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

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

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

62) Bps is short for:

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

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

65) EBCDIC is a

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

67) Frequency is measured in:

68) An advantage of synchronous over asynchronous transmission is:

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

70) ASCII code was.developed by:

71) Which of the following technique uses modulation?

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

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

74) Transmission media are usually categorized as_

75) BCD stands for:

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

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

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

79) The communication channels can be divided into_categories:

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

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

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

83) An example of non-numerical data is:

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

85) Sound,light and radio waves are examples of

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

87) IBM stands for:

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

89) What is another term for guided media?

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

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

92) Transmission from Earth to satellite is called:

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

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

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

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

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

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

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

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