The document contains a quiz about entity relationship models with 7 multiple choice questions. An entity is defined as a real or conceptual "thing" in the database. A many-to-many relationship is represented by a double line symbol. The graphic shows the relationship that a student can own 0, 1 or more cars. An ER model provides a logical view of the data structure and relationships without details of physical implementation.

1. 1
Quiz About
Entity Relationship

2. 2
Question 1
An entity is
A. A real physical “thing”
that is specific to a
particular database
management system
C. A “thing” which has either
a real physical
existence (e.g. a car or
a student) or a
conceptual existence
(e.g. a course)
B. A real physical “thing” or
a conceptual “thing”
that is specific to a
particular database
management system
D. Any physical “thing” that
exists in the real world

3. 3
Question 2
The symbol represents a
A. A one to one relation
C. A many to many
relation
B. A many to one
relation
D. A one to many
relation

4. 4
Question 3
The graphic indicates
A. A student can own
many cars and a car
can be owned by
many students
C. A car can be owned
by many students
B. That a student can
own 0,1 or more
cars
D. A student cannot
own a car

5. 5
Question 4
The symbol represents
A. An entity
C. An attribute
B. A record
D. A relation

6. 6
Question 5
An instance is
A. Any particular entity
C. An attribute of an
entity
B. A particular
occurrence of an
entity (e.g. Tom is
an instance of the
entity STUDENT)
D. A special type of
relation

7. 7
Question 6
The ER model is meant to
A. Enable detailed
descriptions of data
query processing
C. Enable low level
descriptions of data
B. Replace relational
design
D. Be close to a users
perception of the
data

8. 8
Question 7
This graphic
A. Indicates that
many students can
attend many
courses
C. Indicates that there
is a missing entity
B. Indicates that
students have to
attend more than one
course
D. Indicates that
students attend
courses

9. Which of the following statements best
describes the function of an entity relation
9
model
A. An ER model is
concerned primarily
with a logical view of
the data and secondly
with the physical
implementation
C. An ER model provides
a view of the logic of
the data and not the
physical
implementation
B. An ER model is concerned
primarily with a physical
implementation of the data and
secondly with the logical view
D. An ER model is entirely
concerned with modeling the
physical implementation

10. 10
Key
• 1) D
• 2) D
• 3) B
• 4) A
• 5) B
• 6) D
• 7) C