DBMS Unit-1

[Remember] Which symbol is used to represent an entity in an ER diagram?

• A. Circle
• B. Diamond
• C. Rectangle
• D. Square

[Remember] What does a line connecting two entities in an ER diagram represent?

• A. An attribute
• B. A relationship
• C. An identifier
• D. A subtype

[Remember] What is the purpose of an ER diagram?

• A. To display data
• B. To create database tables
• C. To design a database schema
• D. To insert data

[Remember] Which symbol is used to represent a relationship in an ER diagram?

• A. Circle
• B. Diamond
• C. Rectangle
• D. Square

[Remember] What does a double diamond symbol in an ER diagram represent?

• A. A multivalued attribute
• B. A weak entity
• C. A subtype
• D. A derived attribute

[Remember] What is an entity in an ER diagram?

• A. A table in a database
• B. A field in a table
• C. A diagram of a database
• D. A visual representation of a database

An entity set that does not have sufficient attributes to form a primary key is termed a ________

• Strong entity set

• Variant set

• Weak entity set

• Variable set

An ER diagram can express the overall_____of a database graphically

• view structure

• model structure

• logical structure

• Architectural structure

Dashed ellipses represents

• derived attributes

• multi valued attributes

• weak entity sets

• Total participation of an entity

An entity set that has attributes to form primary key,such entity set is termed as

• strong entity set

• weak entity set

• composite entity set

• owner entity set