What geometric symbol is used in an Entity-Relationship (ER) diagram to represent a relationship between entities? MCQ with Answer and Explanation

Question
What geometric symbol is used in an Entity-Relationship (ER) diagram to represent a relationship between entities?
A. Diamond
B. Oval
C. Rectangle
D. Circle
Answer: Option A
Solution (By JKSSB Mock Tests)
Diamonds are utilized in ER diagrams to depict relationships between two or more entities.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
Which of the following is a collection of related data that is stored in a structured format?
A. DBMS
B. Database
C. Data warehouse
D. Information
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Correct Answer: Option B

Explanation:
A database is an organized collection of related data, typically stored electronically and accessed through a DBMS.
This question belongs to: Computer Database Management System (DBMS)
Question #2
What type of key uniquely identifies each record in a table and cannot contain NULL values?
A. Candidate Key
B. Primary Key
C. Foreign Key
D. Secondary Key
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Correct Answer: Option B

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)
Question #3
Which of the following is not a type of database model?
A. Object-oriented
B. Flat-file
C. Hierarchical
D. Network
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Correct Answer: Option B

Explanation:
Flat-file is not a database model; it is a simple file containing records. Hierarchical, Network, Relational, and Object-oriented are database models.
This question belongs to: Computer Database Management System (DBMS)
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