CS403 Mid Term Past Paper
MIDTERM EXAMINATION
Fall 2008
CS403- Database
Management Systems (Session - 2)
Ref No: 101305
Time: 60 min
Marks: 38
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12/13/2008
12:00:00 AM
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11
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14
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Question No: 1 ( Marks: 1 ) - Please choose one
Which
of the following is not a benefit of normalization?
► Minimize insertion anomolies
► Minimize deletion anomolies
► Minimize updation anomolies
► Maximize redundancy
Question No: 2 ( Marks: 1 ) - Please choose one
Which
of the following is NOT a component of a DFD?
► Dataflow
► Datastore
► External
entities
► Relationship
between external entities
Question No: 3 ( Marks: 1 ) - Please choose one
Which
of the following is correct regarding Dataflow diagram?
► Single DFD is required to represent a system
► The dataflow must be bidirectional
► Created at increasing levels of detail
► Used to
represent the relationships among the external entities
Question No: 4 ( Marks: 1 ) - Please choose one
Which of the following is CORRECT about database management
system's languages?
► Data
definition languages are used to specify the conceptual schema only.
► Data
manipulation languages are used to create the databases.
► Data
manipulation languages are used for retrieval, insertion, deletion and
modification of data.
► Data
definition langauges are only used to update data in the DBMS.
Question No: 5 ( Marks: 1 ) - Please choose one
Controlling redundancy in a database management system DOES
NOT help to
► avoid
duplication
► avoid
unnecessary wastage of storage space
► avoid
unauthorised access to data
► avoid
inconsistency among data
Question No: 6 ( Marks: 1 ) - Please choose one
Which of the following concepts is applicable with respect to
3NF?
► Full
functional dependency
► Any
kind of dependency
► Transitive
dependency
► Partial
functional dependency
Question No: 7 ( Marks: 1 ) - Please choose one
Consider
two sets A and B. A contains 3 elements and B contains 4. How many elements do
their cartesian product contains?
► 12
► 9
► 16
► 7
Question No: 8 ( Marks: 1 ) - Please choose one
Consider
two sets A and B. A contains 2 elements and B contains 3. How many elements do
their cartesian product contains?
► 6
► 9
► 4
► 5
Question No: 9 ( Marks: 1 ) - Please choose one
In a
conceptual database model, which of the following most likely represents a
valid identifier for a class grades?
► StudentID
► StudentID, CourseID
► StudentID, CourseID, InstructorID
► StudentID, CourseSectionID
Question No: 10 ( Marks: 1 ) - Please choose one
Identify the correct statement with respect to normalization.
► Normalization
is a formal technique that can be used only at the starting phase of the
database design.
► Normalization
can be used as a top-down standalone database design technique.
► The
process of normalization through decomposition must achieve the lossless join
property at any cost whereas the dependency
reservation property is sometimes
sacrificed.
► The
process of normalization through decomposition must achieve the dependency
reservation property at any cost whereas the lossless
join property is sometimes
sacrificed.
Question No: 11 ( Marks: 1 ) - Please choose one
Consider the following relation and its sample data.
(Consider that these are the only tuples for the given relation)
Which of the following statements is NOT correct?
► The
functional dependency DeptNo -> ProjNo holds over R.
► The
functional dependency EmpNo -> DeptNo holds over R.
► The
functional dependency ProjNo -> DeptNo holds over R.
► The
functional dependency (EmpNo, ProjNo) -> DeptNo holds over R.
Question No: 12 ( Marks: 1 ) - Please choose one
Which
of the following is not true about relational tables?
► Column values are of the same kind.
► Each
row is unique.
► Each
column must have a unique name.
► The
sequence of rows is significant.
Question No: 13 ( Marks: 1 ) - Please choose one
Identify the operation which is NOT one of the parts of the
five basic set operations in relational algebra?
► Join
► Union
► Cartesian
Product
► Set
Difference
Question No: 14 ( Marks: 1 ) - Please choose one
Consider the following statements.
A. An entity integrity constraint states that no
primary key value can be null.
B. A referential integrity constraint is specified
between two relations.
C. A foreign key cannot be used to refer to its own
relation.
Identify which of the above statements is/are correct.
► Only
A
► Only
B
► Only
B and C
► Only A and B
Question No: 15 ( Marks: 1 ) - Please choose one
If K is a foreign key in relation R1, then
► every
tuple of R1 has a distinct value for K.
► K
cannot have a null value for tuples in R1.
► K
is a key for some other relation.
► K
is a primary key for R1.
Question No: 16 ( Marks: 1 ) - Please choose one
Making a change to the conceptual schema of a database but
not affecting the existing external schemas is an example of
► Physical
data independence.
► Concurrency
control.
► Logical
data independence.
► Functional
dependency
Question No: 17 ( Marks: 1 )
In
which condition a relation in first normal form, automatically turns into the
second normal form?
Question No: 18 ( Marks: 1 )
State
one limitation of Data flow diagrams
Question No: 19 ( Marks: 2 )
What
do you know about Insertion anomaly?
Question No: 20 ( Marks: 3 )
What
do you know about the conceptual view of database?
Question No: 21 ( Marks: 5 )
Explain
the purpose of defining processing rights for a database.
Question No: 22 ( Marks: 10 )
Explain and differentiate between Context Level and Level 0
dataflow diagrams.
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