,1. Multiple Choice: Which of the following is a key feature of
an Entity-Relationship (ER) model?
a) Attributes
b) Relations
c) Entities
d) All of the above
Correct Answer: d) All of the above
Rationale: The ER model is fundamental in data modeling
and includes entities (objects), attributes (properties of
objects), and relations (associations between objects).
2. Fill-in-the-Blank: In a database, _________ integrity
ensures that all foreign key values point to existing rows.
Correct Answer: Referential
Rationale: Referential integrity is a database concept that
ensures relationships between tables remain consistent.
3. True/False: Normalization always leads to a performance
increase in database management systems.
Correct Answer: False
Rationale: While normalization reduces data redundancy
and improves data integrity, it can sometimes lead to
performance trade-offs due to increased complexity in
queries.
, Reduced data redundancy
Rationale: Relational databases are designed to ensure
data consistency, scalability, and reduced redundancy,
though they can handle complex transactions, it is not an
inherent benefit.
5. True/False: In a relational database, a tuple is equivalent
to a table row.
Correct Answer: True
Rationale: In relational database terminology, a tuple is a
row within a table, which contains a single record.
6. Multiple Choice: Which normal form is primarily
concerned with the elimination of duplicate data?
a) First Normal Form (1NF)
b) Second Normal Form (2NF)
c) Third Normal Form (3NF)
d) Boyce-Codd Normal Form (BCNF)
Correct Answer: c) Third Normal Form (3NF)
Rationale: 3NF is aimed at reducing the duplication of
data and ensuring that non-key attributes are dependent on
the primary key.
7. Fill-in-the-Blank: _________ is a database management
system feature that ensures any transaction is either fully
completed or rolled back.
Correct Answer: Atomicity
Rationale: Atomicity is one of the ACID properties of
database transactions, ensuring that all operations within a
transaction are completed successfully or none are.
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