Question

4) in a relational model, a tuple refers to a column of a relation.

a) true

b) false

5) all instances of an an entity type have the same set of attributes.

a) True

b) Flase

6) in file based system, each program maintains its own set of data thus avoids redundant data

a) true

b) false

7) relationship types are associated between early instances?

a) true

b) false

Answer 1

4) Answer : b)false

Reason : In a relation,row is called a tuple and column is called an attribute.

5) Answer : a)true

Reason : instances of an entity of same set share the same properties or attributes.

6) Answer : b) false

Reason : In file base system,there might be having duplicate data in more files.so it is waste of memory in files.data redundancy is the main drawback in file base system

7) Answer : a)true

Reason : Relationship types are associated with early instances.example,

One to Many relationship

An instance of an entity is related with more than one instance of another entity.like this relationship types are associated with early instances.