Data Modeling with ER Model Questions and Answers
Data Modeling with ER Model forms the core of any database design process and frequently appears in DBMS aptitude questions and answers during exams and interviews. The Entity-Relationship (ER) model defines data objects, their relationships, and constraints, helping designers create efficient database schemas. For students preparing for Infosys, Cognizant, and TCS NQT, understanding ER diagrams, cardinality, and relationship mapping is crucial. Practicing aptitude questions with solutions PDF on ER models ensures clarity on database conceptual design. Mastering this concept allows candidates to analyze business requirements and translate them into accurate and logical database structures.
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Data Modeling with ER Model
1. Which of the following indicates the maximum number of entities that can be involved in a relationship?
- Minimum cardinality
- Maximum cardinality
- ERD
- Greater Entity Count (GEC)
2. Which type of entity cannot exist in the database unless another type of entity also exists in the database, but does not require that the identifier of that other entity be included as part of its own identifier?
- Weak entity
- Strong entity
- ID-dependent entity
- ID- independent entity
3. In a one-to-many relationship, the entity that is on the one side of the relationship is called a(n) ________ entity.
- parent
- child
- instance
- subtype
4. Which type of entity represents an actual occurrence of an associated generalized entity?
- Supertype entity
- Subtype entity
- Archetype entity
- Instance entity
5. A recursive relationship is a relationship between an entity and ________ .
- itself
- a subtype entity
- an archetype entity
- an instance entity
6. Which of the following indicates the minimum number of entities that must be involved in a relationship?
- Minimum cardinality
- Maximum cardinality
- ERD
- Greater Entity Count (GEC)
7. Which of the following refers to something that can be identified in the users' work environment, something that the users want to track?
- Entity
- Attribute
- Identifier
- Relationship
8. In which of the following is a single-entity instance of one type related to many entity instances of another type?
- One-to-One Relationship
- One-to-Many Relationship
- Many-to-Many Relationship
- Composite Relationship
9. Which of the following refers to an entity in which the identifier of one entity includes the identifier of another entity?
- Weak entity
- Strong entity
- ID-dependent entity
- ID-independent entity
10. Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?
- Supertype entity
- Subtype entity
- Archetype entity
- Instance entity