Object Oriented Database MCQ

Test your knowledge with important Object Oriented Database MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Object Oriented Database MCQs at Bissoy

• An ordered collection of elements of the same type are called sets.
  ক

  True

  খ

  False
• In ODL, you specify an operation using parentheses after its name.
  ক

  True

  খ

  False
• You may specify an object identifier with only one unique tag name.
  ক

  True

  খ

  False
• If you know all the possible values that an attribute can have, you can enumerate those values in ODL.
  ক

  True

  খ

  False
• Specifying a key ensures that no two objects belonging to a class have the same value for the key attribute(s).
  ক

  True

  খ

  False
• An attribute's value is always literal.
  ক

  True

  খ

  False
• Database objects are almost always transient.
  ক

  True

  খ

  False
• An attribute's value is either a literal or an object identifier.
  ক

  True

  খ

  False
• A collection of literals or object types is called a bag.
  ক

  True

  খ

  False
• Literals do not have identifiers, and, therefore, cannot be individually referenced like objects.
  ক

  True

  খ

  False
• The ODMG Object Model supports only unary and binary relationships.
  ক

  True

  খ

  False
• The Object Model supports different literal types, but does not support atomic literals, collection literals, and structured literals.
  ক

  True

  খ

  False
• Before specifying a key for a class, you must specify its extent.
  ক

  True

  খ

  False
• The ODMG Object Model requires that a relationship be specified in both directions.
  ক

  True

  খ

  False
• ODL supports the abstract keyword for classes and operations.
  ক

  True

  খ

  False
• The Object Query Language is which of the following?
  ক

  Similar to SQL and uses a select-from-where structure

  খ

  Similar to SQL and uses a select-where structure

  গ

  Similar to SQL and uses a from-where structure

  ঘ

  Not similar to SQL
• A relationship should be specified how in the ODL?
  ক

  One direction starting with the first class

  খ

  One direction starting with the second class

  গ

  Neither direction

  ঘ

  Both directions
• Which of the following is an ordered collection of elements of the same type?
  ক

  Set

  খ

  Bag

  গ

  List

  ঘ

  Dictionary
• Which of the following is true concerning the following statement: class Manager extends Employee
  ক

  Manager is a concrete class and a superclass.

  খ

  Manager is a concrete class and a subclass.

  গ

  Manager is an abstract class and a superclass.

  ঘ

  Manager is an abstract class and a subclass.
• Which of the following is an unordered collection of elements that may contain duplicates?
  ক

  Set

  খ

  Bag

  গ

  List

  ঘ

  Dictionary
• The reserved word enum is used for which of the following?
  ক

  To define a range for an attribute.

  খ

  To define a range for a class.

  গ

  To define a range for a relationship.

  ঘ

  All of the above.
• Which of the following is true concerning an ODBMS?
  ক

  They have the ability to store complex data types on the Web.

  খ

  They are overtaking RDBMS for all applications.

  গ

  They are most useful for traditional, two-dimensional database table applications.

  ঘ

  All of the above.
• An atomic literal is which of the following?
  ক

  Strings

  খ

  Boolean

  গ

  Long

  ঘ

  All of the above.
• The keyword "inverse" is used in which of the following?
  ক

  Class

  খ

  Attribute

  গ

  Relationship

  ঘ

  All of the above
• Using ODL, you can define which of the following?
  ক

  Attribute

  খ

  Structure

  গ

  Operation

  ঘ

  All of the above
• Identify the class name for the following code: ABC123 course();
  ক

  ABC123

  খ

  course

  গ

  course()

  ঘ

  All of the above
• An extent is which of the following?
  ক

  A keyword that indicates that the subclass inherits from a superclass

  খ

  A keyword that indicates that the superclass inherits from a subclass

  গ

  The set of all instances of a class within a database

  ঘ

  Only one instance of a class within a database
• ODL supports which of the following types of association relationships?
  ক

  Unary

  খ

  Unary and Binary

  গ

  Unary and Binary and Ternary

  ঘ

  Unary and Binary and Ternary and higher