Database MCQ & Objective Questions
Understanding databases is crucial for students preparing for school and competitive exams. Mastering this topic not only enhances your conceptual clarity but also boosts your confidence in tackling exam questions. Practicing MCQs and objective questions on databases helps you identify important questions and improves your exam preparation strategy.
What You Will Practise Here
Fundamentals of Database Management Systems (DBMS)
Types of Databases: Relational, NoSQL, and more
Key Concepts: Tables, Records, and Fields
Database Normalization and its forms
SQL Queries: Basics and advanced operations
Data Models: Hierarchical, Network, and Relational
Common Database Functions and their applications
Exam Relevance
Databases are a significant part of the curriculum in CBSE, State Boards, and competitive exams like NEET and JEE. Questions often focus on definitions, concepts, and practical applications of databases. Expect to see multiple-choice questions that test your understanding of database structures, SQL commands, and normalization processes. Familiarizing yourself with these patterns will greatly enhance your performance in exams.
Common Mistakes Students Make
Confusing different types of databases and their uses
Misunderstanding normalization forms and their significance
Overlooking SQL syntax and common errors in queries
Neglecting the importance of primary and foreign keys
Failing to relate theoretical concepts to practical scenarios
FAQs
Question: What are the main types of databases I should know for exams?Answer: You should focus on relational databases, NoSQL databases, and their respective uses in different scenarios.
Question: How can I improve my SQL query skills?Answer: Regular practice of SQL queries through objective questions and hands-on exercises will enhance your skills significantly.
Now is the time to take charge of your learning! Dive into our practice MCQs on databases and test your understanding. Consistent practice will not only prepare you for exams but also solidify your grasp of essential concepts. Start solving today!
Q. Which normal form requires that a relation is in Second Normal Form and has no transitive dependencies?
A.
First Normal Form
B.
Second Normal Form
C.
Third Normal Form
D.
Boyce-Codd Normal Form
Show solution
Solution
Third Normal Form (3NF) requires that a relation is in Second Normal Form and has no transitive dependencies.
Correct Answer:
C
— Third Normal Form
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Q. Which normal form requires that a table is in 1NF and all non-key attributes are fully functionally dependent on the primary key?
A.
First Normal Form (1NF)
B.
Second Normal Form (2NF)
C.
Third Normal Form (3NF)
D.
Boyce-Codd Normal Form (BCNF)
Show solution
Solution
Second Normal Form (2NF) requires that all non-key attributes are fully functionally dependent on the primary key.
Correct Answer:
B
— Second Normal Form (2NF)
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Q. Which normal form requires that a table is in 1NF and has no partial dependencies?
A.
First Normal Form (1NF)
B.
Second Normal Form (2NF)
C.
Third Normal Form (3NF)
D.
Boyce-Codd Normal Form (BCNF)
Show solution
Solution
Second Normal Form (2NF) requires that a table is in 1NF and has no partial dependencies.
Correct Answer:
B
— Second Normal Form (2NF)
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Q. Which normalization form eliminates transitive dependencies?
A.
First Normal Form
B.
Second Normal Form
C.
Third Normal Form
D.
Boyce-Codd Normal Form
Show solution
Solution
Third Normal Form (3NF) eliminates transitive dependencies.
Correct Answer:
C
— Third Normal Form
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Q. Which of the following best describes a 'weak entity' in an ER model?
A.
An entity that cannot exist without a strong entity
B.
An entity with no attributes
C.
An entity that has a composite key
D.
An entity that is not related to any other entity
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Solution
A weak entity is an entity that cannot exist without a strong entity and relies on it for its identification.
Correct Answer:
A
— An entity that cannot exist without a strong entity
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Q. Which of the following best describes a business rule?
A.
A guideline for database design
B.
A constraint on data values
C.
A policy that governs data usage
D.
All of the above
Show solution
Solution
A business rule can be a guideline, a constraint, or a policy regarding data.
Correct Answer:
D
— All of the above
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Q. Which of the following best describes a data mart?
A.
A large-scale data warehouse
B.
A subset of a data warehouse focused on a specific business area
C.
A type of database management system
D.
A method for data extraction
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Solution
A data mart is a smaller, more focused version of a data warehouse, designed to serve the needs of a specific business area.
Correct Answer:
B
— A subset of a data warehouse focused on a specific business area
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Q. Which of the following best describes a dimension table?
A.
Contains foreign keys
B.
Stores detailed transactional data
C.
Provides context to fact data
D.
Is always normalized
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Solution
Dimension tables provide context to fact data by containing descriptive attributes.
Correct Answer:
C
— Provides context to fact data
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Q. Which of the following best describes a many-to-many relationship?
A.
One entity can relate to many instances of another entity
B.
One entity can relate to only one instance of another entity
C.
Many instances of one entity can relate to many instances of another entity
D.
No relationship exists between the entities
Show solution
Solution
A many-to-many relationship allows many instances of one entity to relate to many instances of another entity.
Correct Answer:
C
— Many instances of one entity can relate to many instances of another entity
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Q. Which of the following best describes a primary key?
A.
A unique identifier for a record in a table
B.
A foreign key that links to another table
C.
An attribute that can have null values
D.
A composite of multiple attributes
Show solution
Solution
A primary key is a unique identifier for a record in a table.
Correct Answer:
A
— A unique identifier for a record in a table
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Q. Which of the following best describes a snowflake schema?
A.
A denormalized structure
B.
A highly normalized structure
C.
A flat structure
D.
A structure with no relationships
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Solution
A snowflake schema is characterized by a highly normalized structure, where dimension tables are normalized into multiple related tables.
Correct Answer:
B
— A highly normalized structure
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Q. Which of the following best describes an Object-Relational Database?
A.
A database that only supports objects
B.
A hybrid of relational and object-oriented features
C.
A database that uses only flat files
D.
A database that does not support SQL
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Solution
An Object-Relational Database combines features of both relational and object-oriented databases.
Correct Answer:
B
— A hybrid of relational and object-oriented features
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Q. Which of the following best describes data mart?
A.
A large-scale data warehouse
B.
A subset of a data warehouse
C.
A type of operational database
D.
A data processing tool
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Solution
A data mart is a subset of a data warehouse, often focused on a specific business line or team.
Correct Answer:
B
— A subset of a data warehouse
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Q. Which of the following best describes data normalization in the context of data warehousing?
A.
Reducing data redundancy
B.
Increasing data redundancy
C.
Creating summary tables
D.
Storing data in flat files
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Solution
Normalization in data warehousing aims to reduce data redundancy and improve data integrity, although denormalization is often used for performance.
Correct Answer:
A
— Reducing data redundancy
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Q. Which of the following best describes ETL in the context of data warehousing?
A.
Extract, Transform, Load
B.
Evaluate, Test, Launch
C.
Execute, Transfer, Log
D.
Extract, Transfer, Load
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Solution
ETL stands for Extract, Transform, Load, which is the process of moving data from source systems into a data warehouse.
Correct Answer:
A
— Extract, Transform, Load
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Q. Which of the following describes a 'transaction' in a database?
A.
A single operation on the database
B.
A sequence of operations treated as a single unit
C.
A method of indexing data
D.
A way to enforce data integrity
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Solution
A transaction is a sequence of operations that are treated as a single unit of work, ensuring data integrity.
Correct Answer:
B
— A sequence of operations treated as a single unit
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Q. Which of the following is a benefit of data warehousing?
A.
Increased data redundancy
B.
Improved data quality
C.
Slower query performance
D.
Complex data management
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Solution
Data warehousing improves data quality by consolidating and cleaning data from various sources.
Correct Answer:
B
— Improved data quality
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Q. Which of the following is a benefit of distributed databases?
A.
Increased data redundancy
B.
Improved data access speed
C.
Simplified database management
D.
Reduced data security
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Solution
Improved data access speed is a benefit of distributed databases as they can provide faster access to data by locating it closer to the user.
Correct Answer:
B
— Improved data access speed
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Q. Which of the following is a benefit of using a snowflake schema?
A.
Simpler queries
B.
Reduced data redundancy
C.
Faster data retrieval
D.
Easier to understand
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Solution
A snowflake schema reduces data redundancy by normalizing dimension tables, which can lead to more efficient storage.
Correct Answer:
B
— Reduced data redundancy
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Q. Which of the following is a benefit of using indexing in a database?
A.
Increased data redundancy
B.
Faster data retrieval
C.
Simplified database design
D.
Reduced storage requirements
Show solution
Solution
Indexing improves the speed of data retrieval operations on a database table.
Correct Answer:
B
— Faster data retrieval
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Q. Which of the following is a benefit of using Object-Oriented Databases?
A.
Easier data modeling for complex applications
B.
Strict adherence to SQL standards
C.
Limited data types
D.
No support for relationships
Show solution
Solution
Object-Oriented Databases provide easier data modeling for complex applications due to their support for complex data types and relationships.
Correct Answer:
A
— Easier data modeling for complex applications
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Q. Which of the following is a characteristic of a data warehouse?
A.
Normalized data structure
B.
Real-time data processing
C.
Historical data storage
D.
Transactional data management
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Solution
Data warehouses are characterized by their ability to store historical data for analysis, unlike operational databases which focus on current transactions.
Correct Answer:
C
— Historical data storage
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Q. Which of the following is a characteristic of a primary key in SQL Server 2000?
A.
It can contain NULL values
B.
It must be unique
C.
It can be duplicated
D.
It can be a composite key only
Show solution
Solution
A primary key must be unique and cannot contain NULL values in SQL Server 2000.
Correct Answer:
B
— It must be unique
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Q. Which of the following is a characteristic of a primary key?
A.
It can contain duplicate values
B.
It can be null
C.
It uniquely identifies a record in a table
D.
It can be changed frequently
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Solution
A primary key uniquely identifies each record in a table and cannot contain duplicate values or be null.
Correct Answer:
C
— It uniquely identifies a record in a table
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Q. Which of the following is a characteristic of a relational database?
A.
Data is stored in tables
B.
Data is stored in files
C.
Data is stored in objects
D.
Data is stored in arrays
Show solution
Solution
A characteristic of a relational database is that data is stored in tables.
Correct Answer:
A
— Data is stored in tables
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Q. Which of the following is a characteristic of a star schema in data warehousing?
A.
Highly normalized structure
B.
Central fact table with dimension tables
C.
Multiple fact tables
D.
Complex relationships between tables
Show solution
Solution
A star schema features a central fact table surrounded by dimension tables, making it easy to query and understand.
Correct Answer:
B
— Central fact table with dimension tables
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Q. Which of the following is a characteristic of a star schema in database design?
A.
Highly normalized structure
B.
Central fact table with dimension tables
C.
Complex relationships between tables
D.
Use of many-to-many relationships
Show solution
Solution
A star schema features a central fact table surrounded by dimension tables, providing a simple and efficient structure for data analysis.
Correct Answer:
B
— Central fact table with dimension tables
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Q. Which of the following is a characteristic of a strong entity?
A.
It has a partial key
B.
It can exist independently
C.
It is represented by a dashed rectangle
D.
It has no attributes
Show solution
Solution
A strong entity can exist independently and has its own primary key.
Correct Answer:
B
— It can exist independently
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Q. Which of the following is a characteristic of a transaction in a database?
A.
Atomicity
B.
Redundancy
C.
Isolation
D.
Both Atomicity and Isolation
Show solution
Solution
Transactions in a database are characterized by properties known as ACID: Atomicity, Consistency, Isolation, and Durability.
Correct Answer:
D
— Both Atomicity and Isolation
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Q. Which of the following is a characteristic of a transaction in a DBMS?
A.
Atomicity
B.
Redundancy
C.
Isolation
D.
Both Atomicity and Isolation
Show solution
Solution
A transaction in a DBMS is characterized by Atomicity and Isolation, ensuring that transactions are completed fully or not at all.
Correct Answer:
D
— Both Atomicity and Isolation
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