Normalization and normal forms MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

1. What is the primary purpose of database normalization?

a) To increase data redundancy
b) To reduce data redundancy
c) To improve data consistency
d) To increase data retrieval speed

Answer: b) To reduce data redundancy

2. Which normal form is concerned with the elimination of partial dependencies?

a) First Normal Form (1NF)
b) Second Normal Form (2NF)
c) Third Normal Form (3NF)
d) Boyce-Codd Normal Form (BCNF)

Answer: b) Second Normal Form (2NF)

3. In which normal form must a table be, to ensure that it has no transitive dependencies?

a) 1NF
b) 2NF
c) 3NF
d) BCNF

Answer: c) Third Normal Form (3NF)

4. What is a transitive dependency in a database?

a) A dependency between non-prime attributes
b) A dependency between a non-prime attribute and a candidate key
c) A dependency in which one attribute is functionally dependent on another through a third attribute
d) A functional dependency that can be removed by splitting the table

Answer: c) A dependency in which one attribute is functionally dependent on another through a third attribute

5. Which of the following normal forms is stricter than 3NF but not as strict as 4NF?

a) 2NF
b) BCNF
c) 1NF
d) 5NF

Answer: b) BCNF

6. Which of the following is a requirement for a table to be in First Normal Form (1NF)?

a) The table must have a primary key
b) All attributes must depend on the whole primary key
c) No repeating groups are allowed
d) There should be no partial dependencies

Answer: c) No repeating groups are allowed

7. A relation is in Boyce-Codd Normal Form (BCNF) if it is in 3NF and which additional condition is satisfied?

a) It has no multi-valued dependencies
b) It has no partial dependencies
c) It has only one candidate key
d) Every determinant is a candidate key

Answer: d) Every determinant is a candidate key

8. What is the primary advantage of decomposing a database into smaller tables during normalization?

a) Improved data redundancy
b) Simplified data retrieval
c) Minimized update anomalies
d) Increased complexity of queries

Answer: c) Minimized update anomalies

9. In a normalized database, what is meant by “update anomaly”?

a) An error caused by the accidental update of a redundant data
b) A situation where updates cannot be performed due to missing data
c) An inconsistency caused by the accidental update of non-key attributes
d) An issue that arises when a table contains redundant data

Answer: c) An inconsistency caused by the accidental update of non-key attributes

10. Which of the following is not a goal of normalization?

a) Eliminating redundant data
b) Reducing data integrity issues
c) Increasing data retrieval speed
d) Organizing data efficiently

Answer: c) Increasing data retrieval speed

 

More MCQs Of Database Systems

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   2. Network model MCQs in DBMS
   3. Relational model MCQs in DBMS
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