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261. Data duplication wastes the space, but also promotes a more serious problem called
  A.  other than those given as options
  B.  isolated
  C.  data inconsistency
  D.  separated data
     
   
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262. When data changes in multiple lists and all lists are not updated. This causes
  A.  Information overload
  B.  Data redundancy
  C.  Duplicate data
  D.  Data inconsistency
     
   
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263. An E-R diagram is a graphic method of presenting
  A.  entity classes and their relationships
  B.  primary keys and their relationships
  C.  primary keys and their relationships to instances
  D.  entity classes and their relationships to primary keys
     
   
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264. In E-R diagram, relationship type is represented by
  A.  dashed ellipse
  B.  diamond
  C.  ellipse
  D.  rectangle
     
   
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265. An entity set that does not have sufficient attributes to form a primary key, is a
  A.  primary entity set
  B.  simple entity set
  C.  strong entity set
  D.  weak entity set
     
   
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266. Communication between a computer and a keyboard involves ........ transmission.
  A.  simplex
  B.  half duplex
  C.  automatic
  D.  full-duplex
     
   
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267. Mobile phone is an example of which type of communication channel?
  A.  Half duplex
  B.  Simplex
  C.  Full duplex
  D.  None of these
     
   
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268. Which of the following cables can transmit data at high speeds?
  A.  Twisted pair cable
  B.  Optic fibre cable
  C.  Co-axial cable
  D.  UTP cable
     
   
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269. Networking using fibre optic cable is done as
  A.  it has high bandwidth
  B.  it is thin and light
  C.  it is not affected by electro magnetic interference/power surges etc
  D.  All of the above
     
   
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270. Which of the following is not a property of fibre optic cabling?
  A.  Transmits at faster speeds than copper cabling
  B.  Carries signals as light waves
  C.  Very resistant to interference
  D.  Easier to capture a signal from the copper cabling
     
   
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