MC	Which statement is CORRECT?	The extent of a class is the set of all current instances.  	correct	Many-to-many relationships cannot be expressed using ODL.	incorrect	ODL is only optimized for Java objects.	incorrect	Unary, binary and ternary relationships are supported in ODL. 	incorrect	
MC	Which statement is NOT CORRECT?	Encapsulation of variables is used to control how and when certain variables are accessed and modified.	incorrect	When subclasses override one or more methods from their superclass, polymorphism allows the objects from the subclasses to respond differently to the same method.	incorrect	OQL can be used for both navigational (procedural) as well as associative (declarative) access.	incorrect	Dynamic binding means that objects are allowed to take the form of either the class they are an instance of, or any of its sub classes.	correct	
MC	What is NOT an advantage of OODBMSs?	They allow to store objects and relationships in a transparent way.	incorrect	They solve the impedance mismatch problem by using the same data model as the programming language.	incorrect	The identity based approach allows for improved performance when performing complex queries involving multiple interrelated objects, avoiding expensive joins. 	incorrect	Scalability and fault-tolerance of OODBMSs is far better than that of their relational counterparts.	correct	
MC	Which statement is NOT CORRECT?	Encapsulation refers to storing a value in a variable, and never changing it again. This way its value is safe forever.	incorrect	Encapsulation refers to storing a value variable, and making it impossible to retrieve it.	incorrect	Encapsulation refers to controlling the way a variable is accessed by forcing users to use getter/setter methods that prevent misuse of the variable.	correct	Encapsulation implies that the methods of a class are not accessible to the other classes. 	incorrect	
MC	What is NOT an advantage of OODBMSs?	The identity based approach allows for improved performance when performing complex queries involving multiple interrelated objects, avoiding expensive joins. 	incorrect	Scalability and fault-tolerance of OODBMSs is far better than that of their relational counterparts.	correct	They solve the impedance mismatch problem by using the same data model as the programming language.	incorrect	They allow to store objects and relationships in a transparent way.	incorrect	
MC	Which statement is NOT CORRECT?	An OID is the same thing as a primary key.	correct	OODBMSs solve the impedance mismatch problem by using the same data model as the programming language.	incorrect	The OQL language provides no explicit support for INSERT, UPDATE, and DELETE operations.  	incorrect	OQL can be used for both navigational (procedural) as well as associative (declarative) access.	incorrect	
MC	Which statement is NOT CORRECT?	Objects are blueprints of classes. "Human", "Employee", "Sale" are examples of objects.	correct	Objects store both a piece of information and ways to manipulate this information.	incorrect	A class can be instantiated into several objects.  	incorrect	Objects are instances of classes. The people "Bart Baesens", "Wilfried Lemahieu" and "Seppe vanden Broucke" could be instances of the class "Person".	incorrect	
MC	Which statement is NOT CORRECT?	Objects store both a piece of information and ways to manipulate this information.	incorrect	Encapsulation implies that the methods of a class are not accessible to the other classes. 	incorrect	Two objects are identical or equivalent when the values of their variables are the same.	correct	Encapsulation refers to storing a value variable, and making it impossible to retrieve it.	incorrect	
MC	Which statement is NOT CORRECT?	OQL is a declarative, non-procedural query language.	incorrect	The OQL language provides no explicit support for INSERT, UPDATE, and DELETE operations.  	incorrect	OQL can be used for both navigational (procedural) as well as associative (declarative) access.	incorrect	Join queries are not supported in OQL.	correct	
MC	Which statement is CORRECT?	Two objects with the same values always have the same OID.	incorrect	An OID is the same as a primary key in a relational database setting.	incorrect	The OID of an object remains the same during the entire lifetime of the object.	correct	Each literal is defined by an OID according to the ODMG standard.	incorrect