DBMS MCQ Questions With Answers Set 10

DBMS MCQ questions with answers set 10 includes the mcqs of datebase anomalies, types of normalization, first normal form, second normal form, third normal form, functional dependency, transitive dependency, multi-valued dependencies, fourth normal form, Boyce-Codd normal form (BCNF) and various database keys concepts.

The following database mcqs are very helpful for those who are preparing UGC NET, GATE exam, UPSC, GMAT, GRE, lecture computer science, database designer job test, database developer jobs test, database administrator test, SPSC, FPSC, KPPSC OR CSS based private or government jobs. Its also helpful for those students who want to be appear in Microsoft SQL and Oracle certification exams.

Database Management System MCQs Set 10

1. Which of the following is TRUE from functional dependency shown as (A, B) → (C, D)?
A). A is the determinant of C
B). A and B together are determined by C and D together
C). A and B together determine D
D). C and D together determine A
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2. What is the highest normal form a relation is in if every determinant is a candidate key?
A). First
B). Second
C). Third
D). BCNF
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3. A relation is considered a _____?
A). Column
B). One-dimensional table
C). Two-dimensional table
D). Three-dimensional table
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4. A functional dependency is a relationship between or among?
A). Tables
B). Rows
C). Columns
D). Attributes
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5. Which of the following is a group of one or more attributes that uniquely identifies a row?
A). key
B). Determinant
C). Tuple
D). Relation
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6. For some relations, changing the data can have undesirable consequences, called _____?
A). Referential integrity constraints
B). Modification anomalies
C). Normal forms
D). Partial dependencies
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7. When the values in one attribute must exist in another attribute, it is called _____?
A). Transitive dependency
B). Insertion anomaly
C). Referential integrity constraints
D). Normal forms
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8. The different classes of relations and the techniques for preventing anomalies are called _____?
A). Normal forms
B). Modification anomalies
C). Referential integrity constraints
D). None of the above
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9. Two or more attributes or attribute collections that can be a key are called _____?
A). Determinants
B). BCNF
C). Candidate Keys
D). Primary Key
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10. A relation is in this form if it is in BCNF and has no multi-value dependencies?
A). First
B). Second
C). Third
D). Fourth
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11. If attribute A determines attribute B and B determines A, the values of the attributes have this relationship _____?
A). One-to-one
B). Many-to-one
C). Normalized
D). Many-to-many
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12. If attribute A determines B but B does not determine A, the relationship among their data values is _____?
A). One-to-one relationship
B). Many-to-many relationship
C). Many-to-one relationship
D). Normalized relationship
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13. One solution to the multi-value dependency constraint problem is to _____?
A). Change the theme
B). Split relation in two relations, each with a single theme
C). Add a composite key
D). Create a new relation
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14. In _____ normal form, any multi-valued attributes have been removed.
A). First
B). Second
C). Fourth
D). Fifth
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15. A relation is in fourth normal form if it is in BCNF and it has no _____?
A). Transitive dependencies
B). Partial dependencies
C). Multi-value dependencies
D). Deletion dependencies
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16. A partial functional dependency (FD) means that _____?
A). Some attributes of an entity are not known
B). Not all attributes on right-hand side of FD are necessary
C). No dependency exists in the entity
D). Not all-of the attributes on the left-hand side of the FD are necessary
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17. The anomalies addressed by moving from BCNF to 4NF generally deal with _____?
A). Inability to uniquely identify an entity
B). Inability to reconstruct relations once they have been decomposed
C). Excessive updates and redundancy of data for each entity
D). Creation of identical rows in a relation
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18. In general, a row in a relation should have all of the data about?
A). Each instance of the relation's theme
B). One instance of the relation's theme
C). No instance of the relation's theme
D). Every instance of the relation's theme
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19. Which of the following is a requirement of 3NF?
A). Must contain a composite
B). Must contain a partial dependency
C). Must contain no partial dependencies
D). Must contain no transitive dependencies
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20. Which is TRUE from functional dependency shown as A → (X, Y)?
A). X is functionally dependent on A
B). A determines Y
C). X and Y are functionally dependent on A
D). A is a determinant
E). All of the above
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21. Which of the following should not be placed in a relatiopal table?
A). Entity
B). Repeating group
C). Attribute
D). Relationship
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22. In BCNF, every _____ in a table is a candidate key.
A). Determinant
B). Entity
C). Atomic attribute
D). Primary Key
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23. An index _____?
A). Makes retrievals faster
B). Is always generated for a primary key
C). Increases the space needed for the database
D). Both a and b
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24. A 3NF violation means _____?
A). An attribute in the table depends on only one part of a concatenated key
B). An attribute in the table can have several values in one record
C). The table has no primary key
D). An attribute in the table belongs in another entity
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25. A relation is not allowed to have _____?
A). Two columns with the same values
B). Two columns with the same domain
C). Two columns with the same names
D). None of these
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