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. How can ADO.NET handle concurrency when working with XML data?
A.
By using optimistic concurrency control
B.
By locking the XML file during access
C.
By using a transaction log
D.
By serializing all access to the XML data
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Solution
ADO.NET can handle concurrency using optimistic concurrency control, which allows multiple users to access the data without locking it.
Correct Answer:
A
— By using optimistic concurrency control
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Q. In a client-server architecture, what is the role of the client?
A.
To manage the database and handle requests
B.
To send requests to the server and display results
C.
To store data locally
D.
To perform data backups
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Solution
In a client-server architecture, the client sends requests to the server and displays results.
Correct Answer:
B
— To send requests to the server and display results
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Q. In a client-server architecture, which layer is responsible for the user interface?
A.
Database layer
B.
Application layer
C.
Network layer
D.
Storage layer
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Solution
In a client-server architecture, the application layer is responsible for the user interface.
Correct Answer:
B
— Application layer
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Q. In a client-server database, what role does the server play?
A.
It processes user requests and manages data storage
B.
It only stores data without processing requests
C.
It acts as a client to other servers
D.
It is responsible for user interface design
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Solution
In a client-server database, the server processes user requests and manages data storage.
Correct Answer:
A
— It processes user requests and manages data storage
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Q. In a client-server database, which component is responsible for processing queries?
A.
Client
B.
Server
C.
Database
D.
Network
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Solution
In a client-server database, the server is responsible for processing queries.
Correct Answer:
B
— Server
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Q. In a database, what does a 'foreign key' do?
A.
Links two tables together
B.
Identifies a unique record
C.
Stores large amounts of data
D.
Indexes a table for faster access
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Solution
A foreign key links two tables together by referencing the primary key of another table.
Correct Answer:
A
— Links two tables together
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Q. In a database, what does ACID stand for?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Concurrency, Integrity, Durability
C.
Atomicity, Consistency, Isolation, Data integrity
D.
Atomicity, Consistency, Isolation, Distribution
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the key properties of transactions in a database.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. In a DBMS architecture, what does the term 'data independence' refer to?
A.
The ability to change the data structure without affecting the application
B.
The ability to access data from multiple sources
C.
The ability to store data in different formats
D.
The ability to secure data from unauthorized access
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Solution
Data independence refers to the ability to change the data structure without affecting the applications that use the data.
Correct Answer:
A
— The ability to change the data structure without affecting the application
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Q. In a distributed database, what is the purpose of data replication?
A.
To ensure data consistency across all nodes
B.
To reduce the size of the database
C.
To increase the complexity of the system
D.
To eliminate the need for backups
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Solution
Data replication in a distributed database ensures data consistency across all nodes by maintaining copies of the same data in multiple locations.
Correct Answer:
A
— To ensure data consistency across all nodes
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Q. In a multiuser database environment, what is a deadlock?
A.
A situation where two transactions are waiting for each other to release locks
B.
A method of data encryption
C.
A type of database backup
D.
A way to optimize queries
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Solution
A deadlock occurs when two transactions are waiting for each other to release locks, preventing both from proceeding.
Correct Answer:
A
— A situation where two transactions are waiting for each other to release locks
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Q. In a multiuser database environment, what is a potential problem that can arise?
A.
Data redundancy
B.
Data inconsistency
C.
Data isolation
D.
Data normalization
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Solution
Data inconsistency can arise in a multiuser database environment when multiple users update the same data simultaneously.
Correct Answer:
B
— Data inconsistency
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Q. In a multiuser database environment, what is the role of a DBMS?
A.
To manage user interfaces
B.
To provide data storage and retrieval services
C.
To perform data analysis
D.
To create reports
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Solution
The primary role of a DBMS in a multiuser environment is to manage data storage and retrieval services efficiently.
Correct Answer:
B
— To provide data storage and retrieval services
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Q. In a relational database, what does a foreign key do?
A.
Links two tables together
B.
Ensures data integrity
C.
Acts as a primary key in another table
D.
All of the above
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Solution
A foreign key links two tables together, ensures data integrity, and can act as a primary key in another table.
Correct Answer:
D
— All of the above
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Q. In a relational database, what does a foreign key represent?
A.
A unique identifier for a table
B.
A reference to a primary key in another table
C.
An attribute of an entity
D.
A constraint on data types
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Solution
A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table.
Correct Answer:
B
— A reference to a primary key in another table
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Q. In a relational database, what is a foreign key?
A.
A unique identifier for a record
B.
A key that links two tables together
C.
A key that is not indexed
D.
A key used for data encryption
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Solution
A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table, establishing a link between them.
Correct Answer:
B
— A key that links two tables together
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Q. In a relational database, what is the purpose of a foreign key?
A.
To uniquely identify a record
B.
To establish a relationship between two tables
C.
To enforce data integrity
D.
To improve query performance
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Solution
A foreign key is used to establish a relationship between two tables, linking records in one table to records in another.
Correct Answer:
B
— To establish a relationship between two tables
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Q. In a star schema, what do the fact tables contain?
A.
Dimension attributes
B.
Aggregated data
C.
Transactional data
D.
Metadata
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Solution
Fact tables in a star schema contain transactional data that can be analyzed, often including measures and foreign keys to dimension tables.
Correct Answer:
C
— Transactional data
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Q. In a star schema, what do the fact tables represent?
A.
Dimensions of the data
B.
Aggregated data
C.
Transactional data
D.
Metadata
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Solution
Fact tables in a star schema represent transactional data, containing measurable, quantitative data for analysis.
Correct Answer:
C
— Transactional data
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Q. In a star schema, what type of table is the central fact table surrounded by?
A.
Dimension tables
B.
Normalization tables
C.
Transaction tables
D.
Index tables
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Solution
In a star schema, the central fact table is surrounded by dimension tables that provide context to the data.
Correct Answer:
A
— Dimension tables
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Q. In a star schema, what type of table is the central fact table?
A.
Dimension table
B.
Lookup table
C.
Aggregate table
D.
Fact table
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Solution
In a star schema, the central table is the fact table, which contains quantitative data for analysis.
Correct Answer:
D
— Fact table
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Q. In ADO.NET, which class is used to represent a connection to a database?
A.
SqlConnection
B.
SqlCommand
C.
SqlDataAdapter
D.
SqlDataReader
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Solution
SqlConnection class is used to establish a connection to a SQL Server database in ADO.NET.
Correct Answer:
A
— SqlConnection
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Q. In an Entity-Relationship (ER) model, what does a diamond shape represent?
A.
Entity
B.
Attribute
C.
Relationship
D.
Weak entity
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Solution
In an ER model, a diamond shape represents a relationship between entities.
Correct Answer:
C
— Relationship
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Q. In an Entity-Relationship (ER) model, what does an entity represent?
A.
A relationship between two tables
B.
A single piece of data
C.
A real-world object or concept
D.
A database transaction
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Solution
In an ER model, an entity represents a real-world object or concept that can have data stored about it.
Correct Answer:
C
— A real-world object or concept
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Q. In an ER diagram, how is a multi-valued attribute represented?
A.
As a rectangle
B.
As an oval
C.
As a double oval
D.
As a diamond
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Solution
A multi-valued attribute is represented as a double oval in an ER diagram.
Correct Answer:
C
— As a double oval
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Q. In an ER diagram, how is a primary key typically represented?
A.
Underlined text
B.
Bold text
C.
Italicized text
D.
In a different color
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Solution
A primary key is typically represented by underlined text in an ER diagram.
Correct Answer:
A
— Underlined text
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Q. In an ER diagram, what does a diamond shape represent?
A.
Entity
B.
Attribute
C.
Relationship
D.
Weak entity
Show solution
Solution
In an ER diagram, a diamond shape represents a relationship between entities.
Correct Answer:
C
— Relationship
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Q. In an ER model, how is a one-to-many relationship typically represented?
A.
With a single line connecting two entities
B.
With a crow's foot notation
C.
With a dashed line
D.
With a double line
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Solution
A one-to-many relationship is typically represented with a crow's foot notation.
Correct Answer:
B
— With a crow's foot notation
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Q. In an ER model, what does a circle represent?
A.
An entity
B.
An attribute
C.
A relationship
D.
A weak entity
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Solution
A circle in an ER model represents an attribute of an entity.
Correct Answer:
B
— An attribute
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Q. In an ER model, what does a diamond shape represent?
A.
Entity
B.
Attribute
C.
Relationship
D.
Weak Entity
Show solution
Solution
In an ER model, a diamond shape represents a relationship between entities.
Correct Answer:
C
— Relationship
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Q. In an ER model, what does a solid line between two entities indicate?
A.
A weak relationship
B.
A strong relationship
C.
A one-to-many relationship
D.
A many-to-many relationship
Show solution
Solution
A solid line between two entities indicates a strong relationship in an ER model.
Correct Answer:
B
— A strong relationship
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