Related Questions

A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).
A True
B False
A subtype discriminator is which of the following?
A An attribute of the supertype whose values determine the subtype
B An attribute of the subtype whose values determine the supertype
C An attribute of the supertype whose values determine the supertype
D An attribute of the subtype whose values determine the subtype
When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?
A Disjoint with total specialization
B Disjoint with partial specialization
C Overlap with total specialization
D Overlap with partial specialization
Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:
A Much easier alignment
B Better linearity
C Greater limiting
D Fewer tuned circuits
Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?
A Supertype entity
B Subtype entity
C Archetype entity
D Instance entity
Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
A ∞
B 0
C 1
D 0.24
Two sets are called disjoint if the ________ is an empty set.
A intersection
B union
C difference
D complement
Which of the following is a subtype of Blob?
A Elemental Object
B Create Object
C Data Object
D File Object
A supertype/subtype hierarchy is which of the following?
A Each subtype has only one attribute
B Each supertype has only one attribute
C Each subtype has only one supertype
D Each supertype has only one subtype
Use of a supertype/subtype relationship is necessary when which of the following exists?
A An instance of a subtype participates in a relationship that is unique to that subtype
B An instance of a subtype participates in a relationship that is the same as the other subtypes
C Attributes apply to all of the instances of an entity type
D No attributes apply to any of the instances of an entity type

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