Database Management System DBMS Solved MCQs

DBMS Multiple Choice Questions with Answers

Hello Friends, this particular section is well focused on the Frequently asked; DBMS Multiple Choice Questions with Answers in the various competitive exam. the set of questions are very basic and easily understandable by reader. we have kept the question hardness level to very basic.

1.DBMS Stand for

Data base marginal system
Directory Based Memory Standard
Data Base Management System
Dual Bus Mask Storage

C. Data Base Management System

2.In the relational modes, cardinality is termed as:

Number of tuples.
Number of attributes.
Number of tables.
Number of constraints.

A. Number of tuples.

3.Relational calculus is a

Procedural language.
Non- Procedural language.
Data definition language.
High level language.

B. Non- Procedural language.

4.The view of total database content is

Conceptual view.
Internal view.
External view.
Physical View.

A. Conceptual view.

5.Cartesian product in relational algebra is

a Unary operator.
a Binary operator.
a Ternary operator.
not defined.

B. a Binary operator.

6.DML is provided for

Description of logical structure of database.
Addition of new structures in the database system.
Manipulation & processing of database.
Definition of physical structure of database system.

C. Manipulation & processing of database.

7.‘AS’ clause is used in SQL for

Selection operation.
Rename operation.
Join operation.
Projection operation.

B. Rename operation.

8.Architecture of the database can be viewed as

two levels.
four levels.
three levels.
one level.

C. three levels.

9.In a relational model, relations are termed as

Tuples
Attributes
Tables
Rows

C. Tables

10.The database schema is written in

C. DDL

1.In case of entity integrity, the primary key may be

not Null
Null
both Null & not Null.
any value.

A. not Null

2.The language used in application programs to request data from the DBMS is referred to as the

A. DML

3.A logical schema

is the entire database.
is a standard way of organizing information into accessible parts.
describes how data is actually stored on disk.
both (A) and (C)

A. is the entire database.

4.Related fields in a database are grouped to form a

data file.
data record.
menu
bank

B. data record.

5.The database environment has all of the following components except:

users
separate files.
database
database administrator.

A. users

6.The language which has recently become the defacto standard for interfacing application programs with relational database system is

Oracle
SQL
DBase
4GL

B. SQL

7.In the architecture of a database system external level is the

physical level.
logical level.
conceptual level
view level.

D. view level.

8.An entity set that does not have sufficient attributes to form a primary key is a

strong entity set.
weak entity set.
simple entity set.
primary entity set.

B. weak entity set.

9.In a Hierarchical model records are organized as

Graph
List
Links
Tree

D. Tree

10.In an E-R diagram attributes are represented by

rectangle
square
ellipse
triangle

C. ellipse

1.Count function in SQL returns the number of

values
distinct values
groups
columns

A. values

2.It is possible to define a schema completely using

VDL and DDL.
DDL and DML.
SDL and DDL.
VDL and DML.

B. DDL and DML.

3.The statement in SQL which allows to change the definition of a table is

Alter
Update
Create
select

A. Alter

4.E-R model uses this symbol to represent weak entity set ?

Dotted rectangle.
Diamond
Doubly outlined rectangle
None of these

C. Doubly outlined rectangle

5.SET concept is used in :

Network Model
Hierarchical Model
Relational Model
None of these

A. Network Model

6.Relational Algebra is

Data Definition Language .
Meta Language
Procedural query Language
None of the above

C. Procedural query Language

7.The conceptual model is

dependent on hardware.
dependent on software.
dependent on both hardware and software .
independent of both hardware and software.

D. independent of both hardware and software.

8. What is a relationship called when it is maintained between two entities?

Unary
Binary
Ternary
Quaternary

B. Binary

9.Which of the following operation is used if we are interested in only certain columns of a table?

PROJECTION
SELECTION
UNION
JOIN

A. PROJECTION

10.Which of the following operations need the participating relations to be union compatible?

UNION
INTERSECTION
DIFFERENCEqq
All of the above

D. All of the above

1.The full form of DDL is

Dynamic Data Language
Detailed Data Language
Data Definition Language
Data Derivation Language

C. Data Definition Language

2.Which of the following is an advantage of view?

Data security
Derived columns
Hiding of complex queries
All of the above

D. All of the above

3.Which of the following is a legal expression in SQL?

SELECT NULL FROM EMPLOYEE;
SELECT NAME FROM EMPLOYEE;
SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;
None of the above

B. SELECT NAME FROM EMPLOYEE;

4.A set of possible data values is called

attribute
degree
tuple
domain

D. domain

5.Which of the operations constitute a basic set of operations for manipulating relational data?

Predicate calculus
Relational calculus
Relational algebra
None of the above

C. Relational algebra

6.Which of the following is another name for weak entity?

Child
Owner
Dominant
All of the above

A. Child

7.Which of the following database object does not physically exist?

base table
index
view
none of the above

C. view

8.Which of the following is record based logical model?

Network Model
Object oriented model
E-R Model
None of these

A. Network Model

9.The natural join is equal to :

Cartesian Product
Combination of Union and Cartesian product
Combination of selection and Cartesian product
Combination of projection and Cartesian product

D. Combination of projection and Cartesian product

10.Which one of the following is not true for a view:

View is derived from other tables.
View is a virtual table.
A view definition is permanently stored as part of the database.
View never contains derived columns.

C. A view definition is permanently stored as part of the database.

1.A primary key if combined with a foreign key creates

Parent-Child relationship between the tables that connect them.
Many to many relationship between the tables that connect them.
Network model between the tables that connect them.
None of the above.

A. Parent-Child relationship between the tables that connect them.

2.In E-R Diagram relationship type is represented by

Ellipse
Dashed ellipse
Rectangle
Diamond

D. Diamond

3.Hierarchical model is also called

Tree structure
Plex Structure
Normalize Structure
Table Structure

A. Tree structure

4.In E-R diagram generalization is represented by

Ellipse
Dashed ellipse
Rectangle
Triangle

D. Triangle

5._________ is a virtual table that draws its data from the result of an SQL SELECT statement.

View
Synonym
Sequence
TrAnsaction

A. View

1.Natural join is equal to?

Cartesian Product
Combination of Union and Cartesian product
Combination of selection and Cartesian product
Combination of projection and Cartesian product

D. Combination of projection and Cartesian product

2.Which one of the following is not true for a view:

View is derived from other tables.
View is a virtual table.
A view definition is permanently stored as part of the database.
View never contains derived columns.

C. A view definition is permanently stored as part of the database.

3.A primary key if combined with a foreign key creates

Parent-Child relationship between the tables that connect them.
Many to many relationship between the tables that connect them.
Network model between the tables that connect them.
None of the above.

A. Parent-Child relationship between the tables that connect them.

4.In E-R Diagram relationship type is represented by

Ellipse
Dashed ellipse
Rectangle
Diamond

D. Diamond

5.A Dada manipulation command the combines the records from one or more tables is called

SELECT
PROJECT
JOIN
PRODUCT

C. JOIN

6.To delete a particular column in a relation the command used is:

UPDATE
DROP
ALTER
DELETE

C. ALTER

7.The ______ operator is used to compare a value to a list of literals values that have been specified

BETWEEN
ANY
IN
ALL

A. BETWEEN

8.A logical schema

is the entire database
is a standard way of organizing information into a accessible part
describe how data is actually stored on disk
none of these

D. none of these

9.A B-tree of order m has maximum of _____________ children

A. m

10._____________ function divides one numeric expression by another and returns the remainder

POWER
MOD
ROUND
REMAINDER

B. MOD

1.In E-R diagram generalization is represented by

Ellipse
Dashed ellipse
Rectangle
Triangle

D. Triangle

2._________ is a virtual table that draws its data from the result of an SQL SELECT statement.

View
Synonym
Sequence
TrAnsaction

A. View

3.The method of access which uses key trAnsformation is known as

Direct
Hash
Random
Sequential

B. Hash

4.A table joined with itself is called

Join
Self Join
Outer Join
Equi Join

B. Self Join

1.The language which has recently become the defacto standard for interfacing application programs with relational database system is

Oracle
SQL
DBase
4GL

B. SQL

2.The way a particular application views the data from the database that the application uses is a

module
relational model.
schema
sub schema

D. sub schema

3.In an E-R diagram an entity set is represent by a

rectangle
ellipse
diamond box.
circle

A. rectangle

4.A report generator is used to

update files.
print files on paper
data entry
delete files

B. print files on paper

5.The property / properties of a database is / are :

It is an integrated collection of logically related records.
It consolidates separate files into a common pool of data records.
Data stored in a database is independent of the application programs using it.
All of the above.

D. All of the above.

6.The DBMS language component which can be embedded in a program is

The data definition language (DDL).
The data manipulation language (DML).
The database administrator (DBA).
A query language

B. The data manipulation language (DML).

7.A relational database developer refers to a record as

a criteria
a relation
a tuple
an attribute

C. a tuple

8.The relational model feature is that there

is no need for primary key data.
is much more data independence than some other database models
are explicit relationships among records.
are tables with many dimensions.

B. is much more data independence than some other database models

9.Conceptual design

is a documentation technique.
needs data volume and processing frequencies to determine the size of the database.
involves modelling independent of the DBMS.
is designing the relational model.

C. involves modelling independent of the DBMS.

10.The method in which records are physically stored in a specified order according to a key field in each record is

hash
direct
sequential
all of the above

A. hash

1.A subschema expresses

the logical view.
the physical view.
the external view.
all of the above

C. the external view.

2.Count function in SQL returns the number of

values
distinct values.
groups
columns

A. values

3.Which one of the following statements is false?

The data dictionary is normally maintained by the database administrator.
Data elements in the database can be modified by changing the data dictionary.
The data dictionary contains the name and description of each data element.
The data dictionary is a tool used exclusively by the database administrator.

B. Data elements in the database can be modified by changing the data dictionary.

4.An advantage of the database management approach is

data is dependent on programs.
data redundancy increases.
data is integrated and can be accessed by multiple programs
None

C. data is integrated and can be accessed by multiple programs

5.A DBMS query language is designed to

support end users who use English-like commands
support in the development of complex applications software.
specify the structure of a database.
all of the above.

D. all of the above.

6.TrAnsaction processing is associated with everything below except

producing detail, summary, or exception reports.
recording a business activity.
confirming an action or triggering a response.
maintaining data.

C. confirming an action or triggering a response.

7.It is possible to define a schema completely using

VDL and DDL.
DDL and DML.
SDL and DDL.
VDL and DML.

B. DDL and DML.

8.The method of access which uses key trAnsformation is known as

direct
hash
random
sequential

B. hash

9.Data independence meAns

data is defined separately and not included in programs.
programs are not dependent on the physical attributes of data.
programs are not dependent on the logical attributes of data
both (B) and (C).

D. both (B) and (C).

10.The statement in SQL which allows to change the definition of a table is

Alter
Update
Create
select

A. Alter

1.E-R model uses this symbol to represent weak entity set ?

Dotted rectangle.
Diamond
Doubly outlined rectangle
None of these

C. Doubly outlined rectangle

2.SET concept is used in :

Network Model
Hierarchical Model
Relational Model
None of these

A. Network Model

3.Relational Algebra is

Data Definition Language
Meta Language
Procedural query Language
None of the above

C. Procedural query Language

4.Key to represent relationship between tables is called

Primary key
Secondary Key
Foreign Key
None of these

C. Foreign Key

5._______ produces the relation that has attributes of R1 and R2

Cartesian product
Difference
Intersection
Product

A. Cartesian product

6.The file organization that provides very fast access to any arbitrary record of a file is

Ordered file
Unordered file
Hashed file
B-tree

C. Hashed file

7.DBMS helps achieve

Data independence
Centralized control of data
Neither (A) nor (B)
both (A) and (B)

D. both (A) and (B)

8.Which of the following are the properties of entities?

Groups
Table
Attributes
Switchboards

C. Attributes

9.In a relation

Ordering of rows is immaterial
No two rows are identical
(A) and (B) both are true
None of these.

C. (A) and (B) both are true

10.Which of the following is correct:

a SQL query automatically eliminates duplicates.
SQL permits attribute names to be repeated in the same relation.
a SQL query will not work if there are no indexes on the relations
None of these

D. None of these

1.It is better to use files than a DBMS when there are

Stringent real-time requirements.
Multiple users wish to access the data.
Complex relationships among data.
All of the above.

B. Multiple users wish to access the data.

2.The conceptual model is

dependent on hardware.
dependent on software.
dependent on both hardware and software .
independent of both hardware and software.

D. independent of both hardware and software.

3.What is a relationship called when it is maintained between two entities?

Unary
Binary
Ternary
Quaternary

B. Binary

4.Which of the following operation is used if we are interested in only certain columns of a table?

Projection
SELECTION
UNION
JOIN

A. Projection

5.Which of the following is a valid SQL type?

CHARACTER
NUMERIC
FLOAT
All of the above

D. All of the above

6.The RDBMS terminology for a row is

tuple
relation
attribute
degree

A. tuple

7.Which of the following operations need the participating relations to be union compatible?

UNION
INTERSECTION
DIFFERENCEqq
All of the above

D. All of the above

8.The full form of DDL is

Dynamic Data Language
Detailed Data Language
Data Definition Language
Data Derivation Language

C. Data Definition Language

9.Which of the following is an advantage of view?

Data security
Derived columns
Hiding of complex queries
All of the above

D. All of the above

10.Which of the following is a legal expression in SQL?

SELECT NULL FROM EMPLOYEE;
Select name from employee
Select name from employee WHERE SALARY = NULL;
None of the above

B. Select name from employee

1.The users who use easy-to-use menu are called

Sophisticated end users
Naïve users
Stand-alone users.
Casual end users.

B. Naïve users

2.Which database level is closest to the users?

External
Internal
Physical
Conceptual

A. External

3.Which are the two ways in which entities can participate in a relationship?

Passive and active
Total and partial
Simple and Complex
All of the above

B. Total and partial

4.The result of the UNION operation between R1 and R2 is a relation that includes

all the tuples of R1
all the tuples of R2
all the tuples of R1 and R2
all the tuples of R1 and R2 which have common columns

D. all the tuples of R1 and R2 which have common columns

5.Which of the following is a comparison operator in SQL?

=
LIKE
BEtween
ALL

D. ALL

6.A set of possible data values is called

attribute
degree
tuple
domain

D. domain

7.Which of the operations constitute a basic set of operations for manipulating relational data?

Predicate calculus
Relational calculus
Relational algebra
None of the above

C. Relational algebra

8.Which of the following is another name for weak entity?

Child
Owner
Dominant
All of the above

A. Child

9.Which of the following database object does not physically exist?

base table
index
view
none of the above

C. view

10.NULL is

the same as 0 for integer
the same as blank for character
the same as 0 for integer and blank for character
Not a value

D. Not a value

1.which of the following is record based logical model?

Network Model
Object oriented model
E-R Model
None of these

A. Network Model

2.A data dictionary is a special file that contains:

The name of all fields in all files.
The width of all fields in all files.
The data type of all fields in all files.
All of the above.

D. All of the above.

3.A file manipulation command that extracts some of the records from a file is called

SELECT
PROJECT
JOIN
PRODUCT

A. SELECT

4.The physical location of a record is determined by a mathematical formula that trAnsforms a file key into a record location is :

B-Tree File
Hashed File
Indexed File
Sequential file.

B. Hashed File

5.A primary key is combined with a foreign key creates

Parent-Child relation ship between the tables that connect them.
Many to many relationship between the tables that connect them.
Network model between the tables that connect them.
None of the above.

A. Parent-Child relation ship between the tables that connect them.

6.In E-R Diagram derived attribute are represented by

Ellipse
Dashed ellipse
Rectangle
Triangle

B. Dashed ellipse

7.Cross Product is a:

Unary Operator
Ternary Operator
Binary Operator
Not an operator

C. Binary Operator

8.An instance of relational schema R (A, B, C) has distinct values of A including NULL values. Which one of the following is true?

A is a candidate key
A is not a candidate key
A is a primary Key
Both (A) and (C)

B. A is not a candidate key

9.Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is ?

MN
M+N
(M+N)/2
2(M+N)

A. MN

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