MCQ
1- ….……………. relates two or more distinct entities
with a specific meaning.
a- Attributes
b- Relationship
c- Strong entites
d- Weak entites
2- Relationships of the same type are grouped or
typed into a …………………..…… .
a- relationship type
b- relationship Instance
c- cardinality ratio
d- identifying relationship
3- ….…………….… is the number of participating
entity types.
a- Relationship type
b- The degree of a relationship type
c- Cardinality ratio
d- Identifying relationship
4- ….……………. exist independently of other types
of entities.
a- Weak entity
b- Strong entities
c- Attributes
d- Identifying relationship
5- .………….. represented with single-line rectangle.
a- Weak entity
b- Strong entities
c- Relationship
d- Derived attribute
6- ….………….. dependent on a strong entity cannot
exist on its own.
a- Strong entity
b- Weak entity
c- Primary key
d- Composite key
7- ………….. represented with double-line rectangle.
a- Strong entity
b- Derived attribute
c- Candidate key
d- Weak entity
8- ….………….. links strong entities to weak entities.
a- Relationship type
b- Identifying relationship
c- Weak entity
d- Attributes
9- ….……….. represented with double line diamond.
a- Weak entity
b- Primary key
c- Identifying relationship
d- Candidate key
10- ….………….. is an entity that does not have a
key attribute and that is identificationdependent on another entity type.
a- Strong entity
b- Weak entity
c- Ternary relationship
d- Composite key
11- ….……………. must participate in identifying
relationship type with an owner or identifying
entity type.
a- Strong entity
b- Weak entity
c- Primary key
d- Candidate key
12- Weak entities are identified by ……………………. .
a- a partial key of the weak entity type
b- the particular entity they are related to in the
identifying relationship type
c- the combination of both A, B
d- None of the above
13- ….……….. is a relationship of one entity related
to another of the same entity type.
a- Unary relationship
b- Binary relationship
c- Ternary relationship
d- Quaternary relationship
14- A relationship of degree two is called ……….… .
a- unary relationship
b- binary relationship
c- ternary relationship
d- quaternary relationship
15- A relationship with degree three is called ……. .
a- unary relationship
b- binary relationship
c- ternary relationship
d- quaternary relationship
16- A relationship of degree four is called ……..…… .
a- unary relationship
b- binary relationship
c- ternary relationship
d- quaternary relationship
17- ….….… is relationship type where same entity
type participates more than once in different
roles.
a- Recursive Relationship
b- Binary relationship
c- Ternary relationship
d- Quaternary relationship
18- Relationships may be given role names to
indicate purpose that each participating entity
type plays in a relationship in ..…….. .
a- recursive Relationship
b- binary relationship
c- ternary relationship
d- quaternary relationship
19- ….…… describes maximum number of possible
relationship occurrences for an entity
participating in a given relationship type.
a- Participation
b- Cardinality
c- Binary relationships
d- Quaternary relationships
20- ….…… determines whether all or only some
entity occurrences participate in a relationship.
a- Participation
b- The degree of a relationship type
c- Cardinality ratio
d- None of the above
21- The most common degree for relationships
is ……………. .
a- unary relationship
b- binary relationship
c- ternary relationship
d- quaternary relationship
22- Cardinality ratios and participation constraints
taken together are called ……… .
a- structural Constraints
b- primary key
c- identifying relationship
d- candidate key
23- ….………….. that limit the possible
combinations of entities that may participate in
the corresponding relationship set.
a- Structural Constraints
b- Participation
c- Cardinality
d- None of the above
24- Each entity in the relationship will have
exactly one related entity in ………….. .
a- One – to – One
b- One – to – Many
c- Many – to – Many
d- None of the above
25- An entity on one side of the relationship can
have many related entities, but an entity on the
other side will have a maximum of one related
entity in …………….. .
a- One – to – One
b- One – to – Many
c- Many – to – Many
d- None of the above
26- Entities on both sides of the relationship can
have many related entities on the other side
in …………..
a- One – to – One
b- One – to – Many
c- Many – to – Many
d- None of the above
27- ….…….. is the number of instances of one
entity that can or must be associated with each
instance of another entity.
a- The total participation
b- The partial participation
c- Cardinality Constraints
d- None of the above
28- If Minimum Cardinality for a field is zero, then
it is ……… .
a- optional
b- mandatory
c- All of the above
d- None of the above
29- If Minimum Cardinality for a field is one or
more, then it is ……….. .
a- optional
b- mandatory
c- All of the above
d- None of the above
30- On an ER model, …………….. is shown as a
double lines connecting the participating entity
type to the relationship.
a- the total participation
b- the partial participation
c- cardinality constraints
31- On an ER model, …………….. is shown as a
single line connecting the participating entity
type to the relationship.
a- the total participation
b- the partial participation
c- cardinality constraints
d- None of the above
32- ……… constraint on each participating entity
type.
a- Participation
b- The degree of a relationship type
c- Cardinality ratio
d- None of the above
33- Total Participation is also called ……… .
a- existence dependency
b- the degree of a relationship type
c- cardinality ratio
d- None of the above
34- ….……. is modeled as the diamond and lines
between entity types.
a- relationship type
b- relationship Instance
c- cardinality ratio
d- identifying relationship
True or False
1. A relationship type can not have attributes.
(False)
2. Two entities can have more than one type of
relationship between them (multiple
relationships). (True)
3. Associative Entity is a combination of
relationship and entity. (True)
4. The relationship type is modeled as the diamond
and lines between entity types. (True)
5. The relationship instance is between specific
entity instances. (True)
6. Cardinality specifies the number of instances of
one entity that can be associated with each
instance of another entity. (True)
7. A strong entity is an entity whose existence
depends on some other entity type. (False)
8. Derived attributes can be concluded from other
attributes. (True)
9. A key attribute can't be composite. (False)
10. Primary key consists of two or more attributes.
(False)
11. The degree of a relationship type is the
number of participating entity types. (True)
12. Strong entity dependent on a week entity and
cannot exist on its own. (False)
13. Identifying relationship links strong entities to
weak entities. (True)
14. Strong entities represented with single-line
rectangle. (True)
15. The degree of a relationship refers to the
number of attributes in the relationship. (False)
16. Multi-valued attributes can have one value for
that attribute. (False)
17. Key attributes must have a unique value. (True)
18. Key attribute may be composite. (True)
19. Recursive relationship type where same entity
type participates more than once in different
roles. (True)
20. The most common degree for relationships is
quaternary. (False)