Entity Relationship Model MCQs | Database Management System Objective Questions and Answers

Questions

1 Every weak entity set can be converted into a strong entity set by :

A using generalization

B adding appropriate attributes

C using aggregation

D none of the above

Answer: Option [B]

2 A weak entity set in an E-R diagram is an entity set that :

A has a primary key

B must be part of a one to many relationship set

C is not existence dependent on a dominant entity

D must not participate as owner in an identifying relationship with another entity set

Answer: Option [B]

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3 E-R model uses which symbol to represent weak entity set :

A Dotted rectangle

B Diamond

C Doubly outlined rectangle

D None of the above

Answer: Option [C]

4 In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect ?

A operationally, If Y is deleted, so is X

B X existence is dependent on Y

C operationally, if X is deleted, so is Y

D operationally, if X is deleted, Y remains the same

Answer: Option [B]

5 The ER model includes additional concepts like :

A Specialization

B Generalization

C Categorization

D All of the above

Answer: Option [D]