Chapter 3 DATABASE MODEL MCQs 13 min Score: 0 Attempted: 0/13 Subscribe 1. The term 'semantic' means? (A) Data (B) Attribute (C) Meaning (D) DetailedShow All Answers 2. Which of the following is not true of semantic objects? (A) Always describe a distinct identity (B) Always provide a sufficient description (C) Are always named (D) Always represent physical entitiesShow All Answers 3. A semantic object? (A) Is a characteristic of an attribute (B) Is a representation of some identifiable thing in the users' work environment (C) Is one or more object attributes that the users employ to identify object instances (D) Is description of an attribute's possible valuesShow All Answers 4. Combinations of composite and compound objects are known as? (A) Hybrid objects (B) Association objects (C) Subtype objects (D) Arch type objectsShow All Answers 5. A semantic object that contains only single-value, simple or group attributes is called? (A) Hybrid objects (B) Composite objects (C) Compound objects (D) Simple objectsShow All Answers 6. Which of the following are used to represent the specialization of objects? (A) Subtype objects (B) Association objects (C) Hybrid objects (D) Archtype objectsShow All Answers 7. The columns of a table correspond to _____? (A) Field (B) Record (C) Table (D) CellShow All Answers 8. A relation is also known as _____? (A) Table (B) Tuple (C) Relationship (D) AttributeShow All Answers 9. An attribute is also known as a _____? (A) Table (B) Field (C) Row (D) RelationShow All Answers 10. Which of the following is NOT a general characteristic of relations _____? (A) The order of columns is significant (B) Each row is unique (C) The order of rows is insignificant (D) Columns are all elemental or atomicShow All Answers 11. Which of the following are properties of relations _____? (A) All of the above (B) No two rows in a relation are identical (C) There are no multivalued attributes in a relation (D) Each attribute has a unique nameShow All Answers 12. How are the E-R model and the semantic object model similar? (A) Both are tools for understanding and documenting the structure of the users' data (B) Both see the concept of entity as basic (C) They both see the semantic object as basic (D) Neither strives to model the structure of the things in the users' worldShow All Answers 13. How many categories of data models in DBMS? (A) 4 (B) 5 (C) 3 (D) none of theseShow All Answers
