Data Communication And Networks 01

1. Data can be either

a. Imagesb. Numbersc. Wordsd. All of these

2. The word Data is derived from

a. Latinb. Contextualc. DBd. None of these

3. How many types of data are

a. 1b. 2c. 3d. 4

4. The types of data are

a. Qualitativeb. Quantitativec. Both a & bd. None of these

5. Data are taken as ________ level of abstraction

a. Highestb. Middlec. Lowestd. None of these

6. Information are taken as ________ level of abstraction

a. Highestb. Middlec. Lowestd. None of these

7. Knowledge are taken as ________ level of abstraction

a. Highestb. Middlec. Lowestd. None of these

8. The quantitative data is expressed in

a. Numerical formb. Non-numerical formc. Both a & bd. None of these

9. The qualitative data is expressed in

a. Numerical formb. Non-numerical formc. Both a & bd. None of these

10. The qualitative data may be

a. Thingsb. Words c. Textd. None of these

11. Which type of data is hard, rigorous, credible and scientific

a. Qualitative datab. Quantitative datac. Both a & bd. None of these

12. Which data are rich, poor, tall, short, good, bad, better

a. Qualitative datab. Quantitative datac. Both a & bd. None of these

13. Data type is thought of as a set of

a. Valuesb. Operations on valuesc. Both a & bd. None of these

14. Data type as defined in programming language are

a. Integersb. Floating-point numbersc. Charactersd. Alphanumeric stringse. All of these

15. The smallest addressable unit of data is defined as a group of ___ bits is known as a byte:

a. 4b. 8c. 16d. 32

16. The unit processed by machine code instructions is called a _______

a. Wordb. Numberc. Bitd. Byte

17. The machine code unit may be _________ depending on the computer architecture:

a. 8 bit or 16 bitb. 16 bit or 32 bitc. 32 bit or 64 bitd. 64bit or 128 bit

18. In a 32-bit word it can represent unsigned integer values ranging from

a. 0 to 232 -1b. -231 to 231-1c. 0 to 264 -1d. 0 to 231 -1

19. In a 32-bit word it can represent signed integer values ranging from

a. 0 to 232 -1b. -231 to 231-1c. 231 to 264 -1d. 0 to 231 -1

20. A signal is an

a. Electric currentb. Electromagnetic fieldc. Electronic currentd. Both a & b

21. A signal is used to convey data froma. One place to another placeb. One system to another systemc. Both a & bd. None of these22. In case of PSTN, signaling between

a. A telephone userb. The telephone networkc. Both a & bd. None of these

23. A channel is defined as a path between a. Transistor and receiver b. Transmitter and transistorc. Transmitter and receiverd. None of these24. The path of channel may be

a. Physicalb. Logicalc. Both a & bd. None of these

25. The path of channel may be

a. Hard wiredb. Wirelessc. Both a & bd. None of these

26. Noise of channel noise___________ the quality of information and data

a. Upgradesb. Degradesc. Both a & bd. None of these

27. In channel , the information may not bea. Reproducedb. Reach the receiver at allc. Both a & bd. None of these28. In channel noise, data by affecting communications and files of all types including

a. Imagesb. Audioc. Textd. Programse. Telemetryf. All of these

29. Information and data may be treated as a signal in either

a. Electrical formb. Electromagnetic formc. Both a & bd. None of these

30. The noise may be classified as ______________ based upon the sources

a. Internalb. Externalc. Both a & bd. None of these

31. The noise generated because of electricity or atmospheric disturbances is of the order of

a. 300kHzb. 300MHzc. 300GHzd. 300Hz

32. The noise generated which is lower than the high frequency range of ____ and may have more interface with the signal of information:

a. 300MHzb. 300kHzc. 300GHzd. 300Hz

33. External noise is generally picked up from electrical appliances existing ____________________a. In the vicinityb. From the atmosphere c. From electrical transformersd. Also from outer spacee. All of these34. Internal noise is generated in the

a. Channelsb. Receiversc. Transmitterd. Both a & b

35. Internal noise is less dependent on frequency, but has a significant effect at:

a. Higher frequencyb. Low frequencyc. Middle frequencyd. No frequency

36. External noise has _______ effect on higher frequencies

a. Moreb. Lessc. Nod. None of these

37. Internal noise is fairly low in case ofa. Digital signal processingb. Fiber optics technologyc. Both a & bd. None of these38. Noise is measured in terms of the signal to noise ratio

a. S/Nb. SNRc. S/Md. Both a & b

39. The unit of noise is

a. decibelsb. Hertzc. Micrond. bits per second

e. 40. ____________ defined as the size of the range of frequencies that can be transmitted through a channele. Channel Bandwidthf. Channel Data Transmission Rateg. Channel noiseh. Channel capacity41. In other words channel bandwidth may be define it as the volume of information per unit time that a _____________________

a. Computerb. Personc. Transmission medium can handled. All of these

42. Channel Bandwidth is measured in

a. decibelsb. Hertzc. Micrond. bits per second

43. Bandwidth is expressed as data speed in ___________ digital systems:

a. decibelsb. Hertzc. Micrond. bits per second

44. In analog systems, bandwidth is expressed as the difference between the

a. Highest frequencyb. Lowest frequencyc. Both a & bd. None of these

45. __________ is determined by the maximum number of bits that can be transmitted per unit time through the physical medium:a. Channel Bandwidthb. Channel Data Transmission Ratec. Channel noised. Channel capacity46. Channel Data Transmission Rate is measured in

a. decibelsb. Hertzc. Micrond. bits per second

47. Which gave the maximum data rate of a noiseless channel a. H.Nyquist in 1924b. H.Nyquist in 1934c. Peter Sain in 1932d. None of these 48. Channel latency depends on the a. Signal propagation speedb. Media characteristicsc. Transmission distanced. All of these49. _____________ is the amount of time that is needed for the information to propagate from the source to destination through the channel:a.

b. Propagation timec. Channel Latencyd. Channel Utilizatione. Both a & b

50. Throughput may be defined as the number of _______________ through a data communication system over a period of time:

a. bitsb. charactersc. blocks passingd. All of these

51. ___________ may be defined as range of frequencies assigned to a channel

a. Bandwidthb. Channel noisec. Bit rated. Channel latency

52. Higher the Bandwidth,________ will be the data transmission rate or throughput

a. Moreb. Lessc. Mediumd. None of these

53. In transmission of a signal, the range of carrier frequencies depends on thea. Nature of mediumb. Requirement of the applications supportedc. Nature of distanced. Both a & b54. ________ may be defined as the range of frequencies being supported by a particular transmission medium

a. Frequencyb. Frequency spectrumc. Carrier frequencyd. None of these

55. The actual range of frequencies supporting a given communication is known as

a. Baud rateb. Pass bandc. Band datad. Pass

56. Higher frequency signal offers _________ bandwidth

a. Lesserb. Greaterc. Mediumd. None of these

57. ________ refers to the minimum or maximum spatial separation between devices over a link, in the context of a complete, end to end circuit

a. Bandwidthb. Channelc. Distanced. None of these

58. _________ is the rate over network speed which is used to detect errors while transmitting data

a. Bit rateb. Data ratec. Baud rated. Pass band

59. What is the frequency range of gamma and cosmic rays

a. >1008GHzb. 1018GHzd.