Descripción: Quiz incluye correccion de las respuestas
Section 2 Quiz
(Answer all questions in this section) 1. Which of the following statements about Entities are true?
Mark for Review (1) Points
(hoose all correct answers) !he" never have #nstances #nstances $%omething$ of signi&cance to the business about which 'ata must be known () !he" are usuall" usuall" a noun noun () A name for a set of similar $things$ () #ncorrect Refer to %ection * +esson * 2. Entities are usuall" verbs !rue or ,alse?
Mark for Review (1) Points
!rue ! rue ,alse () ( ) orrect 3. A-an ........./s value can be a number0 a character string0 a 'ate0 an image0
istinguish nothing istinguish all entities in a 'atabase istinguish one instance of an entit" from all other instances of that entit" () orrect 5. A-an ......... is a 4iece of information that in some wa" 'escribes an entit"
#t is a 4ro4ert" of the entit" an' it quanti&es0 quali&es0 classi&es0 or s4eci&es the entit"
Mark for Review (1) Points
!able Process Attribute () ER orrect
6. !he
Mark for Review
wor' $5olatil e$ means3
(1) Points
+imite' quantit" %tatic6 unlikel" to change +arge quantit" hanging constantl"6 unstable () orrect 7. All of the following coul' be attributes of an E7!#!8 calle' PER%970
e:ce4t which one?
Mark for Review (1) Points
;aircolor Weight
8. A-an ......... is 'e&ne' as $%omething$ of signi&cance to the business
about which 'ata must be known
Mark for Review (1) Points
#nstance Relationshi4 Entit" () 7one of the above #ncorrect Refer to %ection * +esson * 9. A once4tual Mo'el is not concerne' with how the Ph"sical Mo'el will
be im4lemente' !rue or ,alse?
Mark for Review (1) Points
!rue () ,alse #ncorrect Refer to %ection * +esson 1 10. ata mo'els show users the 'ata that their Ph"sical Mo'el will contain
!rue or ,alse?
Mark for Review (1) Points
!rue () ,alse orrect 11. ata
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mo'elin g is 4erform e' for the following reasons3 (hoose !wo)
(1) Points
(hoose all correct answers) #t hel4s 'iscussions an' reviews () We 'raw an ER solel" to 4lease the users6 once com4lete'0 the ER is never referre' to again as it serves no 4ur4ose in the real
worl' We 'o not nee' 'atamo'els6 we can =ust start co'ing right awa" !he ER becomes a blue4rint for 'esigning the actual s"stem () orrect 12. !he Ph"sical Mo'el is 'erive' from the once4tual Mo'el !rue or
,alse?
Mark for Review (1) Points
!rue () ,alse orrect 13. Entit" Relationshi4 mo'eling is 'e4en'ent on the har'ware or
software use' for im4lementation0 so "ou will nee' to change "our ER if "ou 'eci'e to change ;ar'ware 5en'or !rue or ,alse?
Mark for Review (1) Points
!rue ,alse () orrect 14. !he 4ur4ose of an ER is to 'ocument the 4ro4ose' s"stem an'
facilitate 'iscussion an' un'erstan'ing of the requirements ca4ture' b" the 'evelo4er !rue or ,alse?
Mark for Review (1) Points
!rue () ,alse orrect 15. An Entit" Relationshi4 mo'el is in'e4en'ent of the har'ware or