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    Home MCQ subject Computer Database test-3

    Database Test 3 Computer Subject

    Database Test 3 Computer Subject
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    12345

    Question 11

    Which is not included in the definition of an entity?
    Show explanation Expand Question
    Entities represent tangible or identifiable things; actions are not considered entities.
    Not clear enough?

    Question 12

    An entity type whose existence depends on another entity type is called _________ entity?
    Show explanation Expand Question
    A weak entity cannot exist independently and depends on a strong entity.
    Not clear enough?

    Question 13

    An entity that Associates the instances of one or more entity types and contains attributes specific to the relationships is called ________?
    Show explanation Expand Question
    An associative entity is used to model relationships that have attributes specific to the relationship itself.
    Not clear enough?

    Question 14

    A person name, birthday and social security number are all examples of _______?
    Show explanation Expand Question
    These are properties describing an entity, which makes them attributes.
    Not clear enough?

    Question 15

    The most common type of relationship encountered in data modelling is __________ relationship?
    Show explanation Expand Question
    Binary relationships, involving two entities, are the most commonly used in data modeling.
    Not clear enough?

    Question 16

    Which is not a basic construct of an E-R model?
    Show explanation Expand Question
    Identifiers are properties of entities, not a primary construct of the ER model.
    Not clear enough?

    Question 17

    An example of a multi-valued attribute might be ______?
    Show explanation Expand Question
    A multi-valued attribute can have multiple values for a single entity instance, such as multiple college degrees.
    Not clear enough?

    Question 18

    _________ specifies the number of instances of one entity that can or must be associated with each instance of another?
    Show explanation Expand Question
    Cardinality constraints define the number of instances of one entity related to another entity.
    Not clear enough?

    Question 19

    An entity class?
    Show explanation Expand Question
    An entity class defines the structure and represents things users want to track; one instance alone does not define the class.
    Not clear enough?

    Question 20

    All instances of a given entity?
    Show explanation Expand Question
    All instances of an entity share the same attributes and belong to the same entity class, though values differ.
    Not clear enough?
    12345

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