RDBMS is based on which model? MCQ with Answer and Explanation

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RDBMS is based on which model?

A. Relational model

B. Network model

C. Hierarchical model

D. Object-oriented model

Answer: Option A

Solution (By JKSSB Mock Tests)

Relational Database Management System (RDBMS) is based on the relational model proposed by E.F. Codd.

This question belongs to: Computer Database Management System (DBMS)

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Question #1

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What is a database schema?

A. The overall design or structure of the database, including tables, columns, and relationships

B. A query result

C. A backup file

D. A single table

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Correct Answer: Option A

Explanation:
A schema is the logical description of the entire database, defining tables, views, indexes, and constraints.

This question belongs to: Computer Database Management System (DBMS)

Question #2

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What does the SQL command 'INSERT INTO' do?

A. Adds a new row to a table

B. Updates existing rows

C. Creates a table

D. Deletes rows

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Correct Answer: Option A

Explanation:
INSERT INTO is used to insert new records (rows) into a table.

This question belongs to: Computer Database Management System (DBMS)

Question #3

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What type of key uniquely identifies each record in a table and cannot contain NULL values?

A. Secondary Key

B. Candidate Key

C. Foreign Key

D. Primary Key

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Correct Answer: Option D

Explanation:
A Primary Key is a unique identifier for each tuple in a relation. It enforces entity integrity and strictly cannot accept NULL values.

This question belongs to: Computer Database Management System (DBMS)

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