| 41. | Data Models in DBMS are classified into ______ categories. |
| a. | 3 |
| b. | 4 |
| c. | 5 |
| d. | 2 |
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Answer: (a).3
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| 42. | Which of the following is example of Object based logical model ? |
| a. | Entity Relationship Model |
| b. | Hierarchical Model |
| c. | Relational Model |
| d. | Network Model |
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Answer: (a).Entity Relationship Model
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| 43. | Entity Relationship model consists of collection of basic objects called _________ and relationship among these objects. |
| a. | functions |
| b. | models |
| c. | entities |
| d. | None of these |
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Answer: (c).entities
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| 44. | Object which is distinguishable from other objects by specific set of attributes is called as ___________. |
| a. | Classes |
| b. | Entity |
| c. | Attributes |
| d. | None of these |
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Answer: (b).Entity
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| 45. | Association among several entities is called as _____________. |
| a. | Extraction |
| b. | Relationship |
| c. | Combination |
| d. | Association |
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Answer: (b).Relationship
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| 46. | ______________ express the number of entities to which another entity can be associated via a relationship set. |
| a. | Logical Cardinality |
| b. | Mapping Cardinality |
| c. | Messaging Cardinality |
| d. | None of these |
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Answer: (b).Mapping Cardinality
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| 47. | In Object Oriented Model values are stored into __________ variables. |
| a. | Instance |
| b. | Local |
| c. | Static |
| d. | Global |
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Answer: (a).Instance
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| 48. | Collection of tables to represent both data and relationship is described by _____________. |
| a. | Relational Model |
| b. | Entity Relation Model |
| c. | Network Model |
| d. | Entity Model |
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Answer: (a).Relational Model
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| 49. | Ability to modify schema of database in one level without affecting the schema definition in higher level is called as __________. |
| a. | Data Independence |
| b. | Data Isolation |
| c. | Data Migration |
| d. | Data Abstraction |
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Answer: (a).Data Independence
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| 50. | There are _________ levels of data independence. |
| a. | 2 |
| b. | 1 |
| c. | 4 |
| d. | 3 |
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Answer: (a).2
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