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)