| 41. | Data Models in DBMS are classified into ______ categories. |
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Answer: (a).3
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| 42. | Which of the following is example of Object based logical 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. |
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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 ___________. |
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Answer: (b).Entity
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| 45. | Association among several entities is called as _____________. |
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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. |
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Answer: (b).Mapping Cardinality
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| 47. | In Object Oriented Model values are stored into __________ variables. |
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Answer: (a).Instance
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| 48. | Collection of tables to represent both data and relationship is described by _____________. |
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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 __________. |
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Answer: (a).Data Independence
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| 50. | There are _________ levels of data independence. |
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Answer: (a).2
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