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. In the context of ER modeling, what does an 'entity' represent?
A.
A relationship between two tables
B.
A unique identifier for a record
C.
A real-world object or concept
D.
A set of attributes
Show solution
Solution
An 'entity' represents a real-world object or concept in ER modeling.
Correct Answer:
C
— A real-world object or concept
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Q. In the context of Object-Oriented Databases, what is 'encapsulation'?
A.
Hiding the internal state of an object
B.
Creating multiple instances of a class
C.
Normalizing data
D.
Establishing relationships between tables
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Solution
Encapsulation is the concept of hiding the internal state of an object and requiring all interaction to be performed through an object's methods.
Correct Answer:
A
— Hiding the internal state of an object
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Q. In the context of transactions, what does ACID stand for?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Concurrency, Integrity, Durability
C.
Accuracy, Consistency, Isolation, Durability
D.
Atomicity, Consistency, Isolation, Data
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties that guarantee reliable transactions.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. In the context of XML and ADO.NET, what does the DataSet represent?
A.
A single table of data
B.
An in-memory representation of data
C.
A direct connection to the database
D.
A method for data normalization
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Solution
The DataSet in ADO.NET represents an in-memory collection of data, which can include multiple tables and relationships.
Correct Answer:
B
— An in-memory representation of data
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Q. In the context of XML and ADO.NET, what does the term 'serialization' refer to?
A.
Converting XML data into a database format
B.
Transforming a DataSet into XML format
C.
Storing XML data in a binary format
D.
Creating a schema for XML data
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Solution
Serialization in this context refers to the process of converting a DataSet or other data structure into XML format for storage or transmission.
Correct Answer:
B
— Transforming a DataSet into XML format
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Q. What does 'concurrency control' refer to in Object-Oriented Databases?
A.
Managing simultaneous operations without conflicts
B.
Creating new object classes
C.
Normalizing data structures
D.
Defining relationships between objects
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Solution
Concurrency control refers to managing simultaneous operations to ensure data integrity and prevent conflicts.
Correct Answer:
A
— Managing simultaneous operations without conflicts
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Q. What does 'polymorphism' in Object-Oriented Databases refer to?
A.
The ability to process different data types in a uniform way
B.
The use of multiple databases
C.
The normalization of data
D.
The creation of multiple tables
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Solution
Polymorphism refers to the ability to process different data types in a uniform way, allowing for flexibility in data handling.
Correct Answer:
A
— The ability to process different data types in a uniform way
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Q. What does a crow's foot notation indicate in an ER diagram?
A.
One-to-one relationship
B.
One-to-many relationship
C.
Many-to-many relationship
D.
No relationship
Show solution
Solution
A crow's foot notation indicates a one-to-many relationship in an ER diagram.
Correct Answer:
B
— One-to-many relationship
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Q. What does a foreign key do in a relational database?
A.
Links two tables together
B.
Defines a primary key
C.
Indexes a table
D.
Stores unique values
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Solution
A foreign key in a relational database links two tables together by referencing the primary key of another table.
Correct Answer:
A
— Links two tables together
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Q. What does a primary key do in an ER model?
A.
Links two entities
B.
Identifies a unique record
C.
Defines a relationship type
D.
Stores multiple values
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Solution
A primary key uniquely identifies a record in a database table.
Correct Answer:
B
— Identifies a unique record
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Q. What does a primary key in an ER model signify?
A.
A unique identifier for an entity
B.
A foreign key reference
C.
An attribute that can be null
D.
A relationship type
Show solution
Solution
A primary key signifies a unique identifier for an entity in an ER model.
Correct Answer:
A
— A unique identifier for an entity
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Q. What does a solid line represent in an ER diagram?
A.
A weak relationship
B.
A strong relationship
C.
An attribute
D.
An entity
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Solution
A solid line in an ER diagram represents a strong relationship between entities.
Correct Answer:
B
— A strong relationship
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Q. What does ACID stand for in the context of database transactions?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Consistency, Integrity, Durability
C.
Atomicity, Concurrency, Isolation, Durability
D.
Atomicity, Consistency, Isolation, Data
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties that guarantee reliable processing of database transactions.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. What does ADO.NET primarily use to interact with XML data?
A.
DataSet
B.
DataReader
C.
DataAdapter
D.
Command
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Solution
ADO.NET uses DataSet to work with XML data, allowing for in-memory representation and manipulation.
Correct Answer:
A
— DataSet
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Q. What does an entity represent in an ER model?
A.
A relationship between two tables
B.
A real-world object or concept
C.
A specific attribute of a table
D.
A constraint on data
Show solution
Solution
An entity represents a real-world object or concept in an ER model.
Correct Answer:
B
— A real-world object or concept
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Q. What does an Entity-Relationship (ER) model primarily represent?
A.
The physical storage of data
B.
The relationships between data entities
C.
The SQL queries for data retrieval
D.
The performance metrics of a database
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Solution
An Entity-Relationship (ER) model primarily represents the relationships between data entities.
Correct Answer:
B
— The relationships between data entities
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Q. What does concurrency control in a DBMS ensure?
A.
Data redundancy
B.
Data integrity during simultaneous access
C.
Faster data retrieval
D.
Data backup
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Solution
Concurrency control ensures data integrity when multiple users access the database simultaneously.
Correct Answer:
B
— Data integrity during simultaneous access
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Q. What does JDBC stand for?
A.
Java Database Connectivity
B.
Java Data Base Connection
C.
Java Data Connection Bridge
D.
Java Database Connection
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Solution
JDBC stands for Java Database Connectivity, which is an API for connecting and executing queries on a database.
Correct Answer:
A
— Java Database Connectivity
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Q. What does JSP stand for in the context of web development?
A.
Java Server Pages
B.
Java Simple Pages
C.
Java Script Pages
D.
Java Server Protocol
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Solution
JSP stands for Java Server Pages, which is a technology used for developing web pages that support dynamic content.
Correct Answer:
A
— Java Server Pages
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Q. What does normalization aim to achieve in database design?
A.
Data redundancy
B.
Data integrity
C.
Data security
D.
Data accessibility
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Solution
Normalization aims to achieve data integrity by organizing data to reduce redundancy and improve data consistency.
Correct Answer:
B
— Data integrity
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Q. What does normalization aim to achieve?
A.
Reduce data redundancy
B.
Increase data integrity
C.
Simplify database design
D.
All of the above
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Solution
Normalization aims to achieve all of the above by organizing data to minimize redundancy and dependency.
Correct Answer:
D
— All of the above
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Q. What does ODBC stand for?
A.
Open Database Connectivity
B.
Open Data Base Connection
C.
Object Database Connection
D.
Open Data Base Connectivity
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Solution
ODBC stands for Open Database Connectivity, which is a standard API for accessing database management systems.
Correct Answer:
A
— Open Database Connectivity
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Q. What does the ACID acronym stand for in database transactions?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Consistency, Integrity, Durability
C.
Atomicity, Concurrency, Isolation, Durability
D.
Atomicity, Consistency, Isolation, Data
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties that guarantee reliable transaction processing.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. What does the ACID property in transactions stand for?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Consistency, Integrity, Durability
C.
Atomicity, Concurrency, Isolation, Durability
D.
Atomicity, Consistency, Isolation, Data
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are key properties that guarantee reliable transaction processing.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. What does the acronym ACID stand for in the context of transactions?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Concurrency, Isolation, Durability
C.
Atomicity, Consistency, Integrity, Durability
D.
Atomicity, Consistency, Isolation, Data
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties of database transactions.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
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Q. What does the acronym ER stand for in database modeling?
A.
Entity Relationship
B.
Entity Relation
C.
Entity Record
D.
Entity Reference
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Solution
ER stands for Entity Relationship in database modeling.
Correct Answer:
A
— Entity Relationship
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Q. What does the term 'ACID' stand for in database transactions?
A.
Atomicity, Consistency, Isolation, Durability
B.
Atomicity, Consistency, Integrity, Durability
C.
Atomicity, Concurrency, Isolation, Durability
D.
Atomicity, Consistency, Isolation, Dependability
Show solution
Solution
ACID stands for Atomicity, Consistency, Isolation, and Durability, which are the properties that guarantee reliable processing of database transactions.
Correct Answer:
A
— Atomicity, Consistency, Isolation, Durability
Learn More →
Q. What does the term 'cardinality' refer to in an ER model?
A.
The number of attributes in an entity
B.
The number of entities in a relationship
C.
The type of data stored in an entity
D.
The uniqueness of an entity
Show solution
Solution
Cardinality refers to the number of entities involved in a relationship.
Correct Answer:
B
— The number of entities in a relationship
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Q. What does the term 'concurrency control' refer to in a database system?
A.
Managing multiple database connections
B.
Ensuring data consistency during simultaneous transactions
C.
Optimizing query performance
D.
Backing up data regularly
Show solution
Solution
Concurrency control refers to the management of simultaneous operations on a database without conflicting, ensuring data consistency.
Correct Answer:
B
— Ensuring data consistency during simultaneous transactions
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Q. What does the term 'concurrency control' refer to in a DBMS?
A.
Managing multiple database connections
B.
Ensuring data consistency during simultaneous transactions
C.
Optimizing query performance
D.
Backing up data
Show solution
Solution
Concurrency control refers to the management of simultaneous operations on a database without conflicting.
Correct Answer:
B
— Ensuring data consistency during simultaneous transactions
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