Database Management System Solved MCQs

 

 

DML is provided for

A. Description of logical structure of database.

B. Addition of new structures in the database system.

C. Manipulation & processing of database. ✔

D. Definition of physical structure of database system.

‘AS’ clause is used in SQL for

A. Selection operation.

B. Rename operation. ✔

C. Join operation.

D. Projection operation.

7 ODBC stands for

A. Object Database Connectivity.

B. Oral Database Connectivity.

C. Oracle Database Connectivity.

D. Open Database Connectivity. ✔

Architecture of the database can be viewed as

A. two levels.

B. four levels.

C. three levels. ✔

D. one level.

In a relational model, relations are termed as

A. Tuples.

B. Attributes

C. Tables. ✔

D. Rows.

The database schema is written in

A. HLL

B. DML

C. DDL✔

D. DCL

In the relational modes, cardinality is termed as:

A. Number of tuples. ✔

B. Number of attributes.

C. Number of tables.

D. Number of constraints.

Relational calculus is a

A. Procedural language.

B. Non- Procedural language. ✔

C. Data definition language.

D. High level language.

The view of total database content is

A. Conceptual view. ✔

B. Internal view.

C. External view.

D. Physical View.

Cartesian product in relational algebra is

A. a Unary operator.

B. a Binary operator. ✔

C. a Ternary operator.

D. not defined.

In the architecture of a database system external level is the

A. physical level.

B. logical level.

C. conceptual level

D. view level. ✔

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

A. strong entity set.

B. weak entity set. ✔

C. simple entity set.

D. primary entity set.

In a Hierarchical model records are organized as

A. Graph.

B. List.

C. Links.

D. Tree. ✔

In an E-R diagram attributes are represented by

A. rectangle.

B. square.

C. ellipse. ✔

D. triangle.

Which of the following is another name for weak entity?

A. Child ✔

B. Owner

C. Dominant

D. All of the above

Which of the following database object does not physically exist?

A. base table

B. index

C. view✔

D. none of the above

NULL is

A. the same as 0 for integer

B. the same as blank for character

C. the same as 0 for integer and blank for character

D. not a value✔

Which of the following is record based logical model?

A. Network Model✔

B. Object oriented model

C. E-R Model

D. None of these

A data dictionary is a special file that contains:

A. The name of all fields in all files.

B. The width of all fields in all files.

C. The data type of all fields in all files.

D. All of the above. ✔

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

A. SELECT✔

B. PROJECT

C. JOIN

D. PRODUCT

The physical location of a record is determined by a mathematical formula that transforms

a file key into a record location is :

A. B-Tree File

B. Hashed File✔

C. Indexed File

D. Sequential file.

In case of entity integrity, the primary key may be

A. not Null✔

B. Null

C. both Null & not Null.

D. any value.

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

to as the

A. DML✔

B. DDL

C. VDL

D. SDL

A logical schema

A. is the entire database. ✔

B. is a standard way of organizing information into accessible parts.

C. describes how data is actually stored on disk.

D. both A. and C.

Related fields in a database are grouped to form a

A. data file.

B. data record. ✔

C. menu.

D. bank.

The database environment has all of the following components except:

A. users. ✔

B. separate files.

C. database.

D. database administrator.

The language which has recently become the defacto standard for interfacing application

programs with relational database system is

A. Oracle.

B. SQL. ✔

C. DBase.

D. 4GL.

The way a particular application views the data from the database that the application

uses is a

A. module.

B. relational model.

C. schema.

D. sub schema. ✔

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

A. rectangle. ✔

B. ellipse.

C. diamond box.

D. circle.

A report generator is used to

A. update files.

B. print files on paper. ✔

C. data entry.

D. delete files.

The property / properties of a database is / are :

A. It is an integrated collection of logically related records.

B. It consolidates separate files into a common pool of data records.

C. Data stored in a database is independent of the application programs using it.

D. All of the above. ✔

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

A. The data definition language (DDL).

B. The data manipulation language (DML). ✔

C. The database administrator (DBA).

D. A query language.

A relational database developer refers to a record as

A. a criteria.

B. a relation.

C. a tuple. ✔

D. an attribute.

The relational model feature is that there

A. is no need for primary key data.

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

C. are explicit relationships among records.

D. are tables with many dimensions.

Conceptual design

A. is a documentation technique.

B. needs data volume and processing frequencies to determine the size of the database.

C. involves modelling independent of the DBMS. ✔

D. is designing the relational model.

The method in which records are physically stored in a specified order according to a key

field in each record is

A. hash. ✔

B. direct.

C. sequential.

D. all of the above.

A subschema expresses

A. the logical view.

B. the physical view.

C. the external view. ✔

D. all of the above.

Count function in SQL returns the number of

A. values. ✔

B. distinct values.

C. groups.

D. columns.

Which one of the following statements is false?

A. The data dictionary is normally maintained by the database

administrator.

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

C. The data dictionary contains the name and description of each data element.

D. The data dictionary is a tool used exclusively by the database administrator.

An advantage of the database management approach is

A. data is dependent on programs.

B. data redundancy increases.

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

D. none of the above.

A DBMS query language is designed to

A. support end users who use English-like commands.

B. support in the development of complex applications software.

C. specify the structure of a database.

D. all of the above. ✔

Transaction processing is associated with everything below except

A. producing detail, summary, or exception reports.

B. recording a business activity.

C. confirming an action or triggering a response. ✔

D. maintaining data.

It is possible to define a schema completely using

A. VDL and DDL.

B. DDL and DML. ✔

C. SDL and DDL.

D. VDL and DML.

The method of access which uses key transformation is known as

A. direct.

B. hash. ✔

C. random.

D. sequential.

Data independence means

A. data is defined separately and not included in programs.

B. programs are not dependent on the physical attributes of data.

C. programs are not dependent on the logical attributes of data.

D. both B. and C.. ✔

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

A. Alter. ✔

B. Update.

C. Create.

D. select.

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

A. Dotted rectangle.

B. Diamond

C. Doubly outlined rectangle✔

D. None of these

SET concept is used in :

A. Network Model✔

B. Hierarchical Model

C. Relational Model

D. None of these

Relational Algebra is

A. Data Definition Language .

B. Meta Language

C. Procedural query Language✔

D. None of the above

Key to represent relationship between tables is called

A. Primary key

B. Secondary Key

C. Foreign Key✔

D. None of these

 _______ produces the relation that has attributes of R1 and R2

A. Cartesian product✔

B. Difference

C. Intersection

D. Product

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

A. Ordered file

B. Unordered file

C. Hashed file✔

D. B-tree

DBMS helps achieve

A. Data independence

B. Centralized control of data

C. Neither A. nor B.

D. both A. and B. ✔

Which of the following are the properties of entities?

A. Groups

B. Table

C. Attributes✔

D. Switchboards

In a relation

A. Ordering of rows is immaterial

B. No two rows are identical

C. A. and B. both are true✔

D. None of these.

Which of the following is correct:

A. a SQL query automatically eliminates duplicates.

B. SQL permits attribute names to be repeated in the same relation.

C. a SQL query will not work if there are no indexes on the relations

D. None of these✔

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

A. Stringent real-time requirements.

B. Multiple users wish to access the data. ✔

C. Complex relationships among data.

D. All of the above.

The conceptual model is

A. dependent on hardware.

B. dependent on software.

C. dependent on both hardware and software .

D. independent of both hardware and software. ✔

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

A. Unary

B. Binary✔

C. Ternary

D. Quaternary

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

table?

A. PROJECTION✔

B. SELECTION

C. UNION

D. JOIN

Which of the following is a valid SQL type?

A. CHARACTER

B. NUMERIC

C. FLOAT

D. All of the above✔

The RDBMS terminology for a row is

A. tuple. ✔

B. relation.

C. attribute.

D. degree.

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

A. UNION

B. INTERSECTION

C. DIFFERENCE

D. All of the above✔

Which of the following is an advantage of view?

A. Data security

B. Derived columns

C. Hiding of complex queries

D. All of the above✔

Which of the following is a legal expression in SQL?

A. SELECT NULL FROM EMPLOYEE;

B. SELECT NAME FROM EMPLOYEE; ✔

C. SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;

D. None of the above

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

A. Sophisticated end users.

B. Naïve users. ✔

C. Stand-alone users.

D. Casual end users.

Which database level is closest to the users?

A. External ✔

B. Internal

C. Physical

D. Conceptual

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

A. Passive and active

B. Total and partial✔

C. Simple and Complex

D. All of the above

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

A. all the tuples of R1

B. all the tuples of R2

C. all the tuples of R1 and R2

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

Which of the following is a comparison operator in SQL?

A. =

B. LIKE

C. BETWEEN

D. All of the above✔

A set of possible data values is called

A. attribute.

B. degree.

C. tuple.

D. domain. ✔

Which of the operations constitute a basic set of operations for manipulating relational

data?

A. Predicate calculus

B. Relational calculus

C. Relational algebra✔

D. None of the above

Using Relational Algebra the query that finds customers, who have a balance of over

1000 is

A. PCustomer_name(s balance >1000(Deposit)) ✔

B. s Customer_name(Pbalance >1000(Deposit))

C. PCustomer_name(s balance >1000(Borrow))

D. s Customer_name(Pbalance >1000(Borrow))

A primary key is combined with a foreign key creates

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

B. Many to many relationship between the tables that connect them.

C. Network model between the tables that connect them.

D. None of the above.

In E-R Diagram derived attribute are represented by

A. Ellipse

B. Dashed ellipse✔

C. Rectangle

D. Triangle

Cross Product is a:

A. Unary Operator

B. Ternary Operator

C. Binary Operator✔

D. Not an operator

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. A is a candidate key

B. A is not a candidate key✔

C. A is a primary Key

D. Both A. and C.

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:

A. mn✔

B. m+n

C. (m+n)/2

D. 2(m+n)

The natural join is equal to :

A. Cartesian Product

B. Combination of Union and Cartesian product

C. Combination of selection and Cartesian product

D. Combination of projection and Cartesian product✔

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

A. View is derived from other tables.

B. View is a virtual table.

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

D. View never contains derived columns.

A primary key if combined with a foreign key creates

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

B. Many to many relationship between the tables that connect them.

C. Network model between the tables that connect them.

D. None of the above.

In E-R Diagram relationship type is represented by

A. Ellipse

B. Dashed ellipse

C. Rectangle

D. Diamond✔

Hierarchical model is also called

A. Tree structure✔

B. Plex Structure

C. Normalize Structure

D. Table Structure

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

A. UPDATE

B. DROP

C. ALTER✔

D. DELETE

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

specified.

A. BETWEEN✔

B. ANY

C. IN

D. ALL

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

A. m✔

B. m+1

C. m-1

D. m/2

_____________ function divides one numeric expression by another and returns the

remainder.

A. POWER

B. MOD✔

C. ROUND

D. REMAINDER

A data manipulation command the combines the records from one or more tables is called

A. SELECT

B. PROJECT

C. JOIN✔

D. PRODUCT

In E-R diagram generalization is represented by

A. Ellipse

B. Dashed ellipse

C. Rectangle

D. Triangle✔

 _________ is a virtual table that draws its data from the result of an SQL

SELECT statement.

A. View✔

B. Synonym

C. Sequence

D. Transaction

The method of access which uses key transformation is known as

A. Direct

B. Hash✔

C. Random

D. Sequential

A table joined with itself is called

A. Join

B. Self Join✔

C. Outer Join

D. Equi Join

 _________ data type can store unstructured data

A. RAW✔

B. CHAR

C. NUMERIC

D. VARCHAR

Which of the following is generally used for performing tasks like creating the structure of the relations, deleting relation?

A.        DML(Data Manipulation Language)

B.        Query

C.        Relational Schema

D.        DDL(Data Definition Language) ✔

Which of the following provides the ability to query information from the database and insert tuples into, delete tuples from, and modify tuples in the database?

A.        DML(Data Manipulation Language) ✔

B.        DDL(Data Definition Language)

C.        Query

D.        Relational Schema

In the following Query, which of the following can be placed in the Query's blank portion to display the salary from highest to lowest amount, and sorting the employs name alphabetically?

A.        Ascending, Descending

B.        Asc, Desc

C.        Desc, Asc✔

D.        All of the above

A Database Management System is a type of _________software.

A.        It is a type of system software✔

B.        It is a kind of application software

C.        It is a kind of general software

D.        Both A and C

 

 The term "FAT" is stands for_____

A.        File Allocation Tree

B.        File Allocation Table✔

C.        File Allocation Graph

D.        All of the above

 Which of the following can be considered as the maximum size that is supported by FAT?

A.        8GB

B.        4GB✔

C.        4TB

D.        None of the above

 The term "NTFS" refers to which one of the following?

A.        New Technology File System✔

B.        New Tree File System

C.        New Table type File System

D.        Both A and C

 Which of the following can be considered as the maximum size that is supported by NTFS?

A.        4GB✔

B.        16TB

C.        64TB

D.        8TB

 A huge collection of the information or data accumulated form several different sources is known as ________:

A.        Data Management

B.        Data Mining

C.        Data Warehouse✔

D.        Both B and C

 Which of the following can be used to extract or filter the data & information from the data warehouse?

A.        Data redundancy

B.        Data recovery tool

C.        Data mining✔

D.        Both B and C

 Which one of the following refers to the copies of the same data (or information) occupying the memory space at multiple places.

A.        Data Repository

B.        Data Inconsistency

C.        Data Mining

D.        Data Redundancy✔

 Which one of the following refers to the "data about data"?

A.        Directory

B.        Sub Data

C.        Warehouse

D.        Meta Data✔

 Which of the following refers to the level of data abstraction that describes exactly how the data actually stored?

A.        Conceptual Level

B.        Physical Level✔

C.        File Level

D.        Logical Level

 To which of the following the term "DBA" referred?

A.        Data Bank Administrator

B.        Database Administrator✔

C.        Data Administrator

D.        None of the above

 In general, a file is basically a collection of all related______.

A.        Rows & Columns

B.        Fields

C.        Database

D.        Records✔

 The term "Data" refers to:

A.        The electronic representation of the information( or data)

B.        Basic information

C.        Row Facts and figures✔

D.        Both A and C

 Rows of a relation are known as the _______.

A.        Degree

B.        Tuples

C.        Entity

D.        All of the above✔

 Which of the following refers to the number of tuples in a relation?

A.        Entity

B.        Column

C.        Cardinality✔

D.        None of the above

Which one of the following is a type of Data Manipulation Command?

A.        Create

B.        Alter

C.        Delete✔

D.        All of the above

 Which of the following command is a type of Data Definition language command?

A.        Create✔

B.        Update

C.        Delete

D.        Merge

 Which of the following is a top-down approach in which the entity's higher level can be divided into two lower sub-entities?

A.        Aggregation

B.        Generalization

C.        Specialization✔

D.        All of the above

 In which one of the following, the multiple lower entities are grouped (or combined) together to form a single higher-level entity?

A.        Specialization

B.        Generalization✔

C.        Aggregation

D.        None of the above

In a relation database, every tuples divided into the fields are known as the______.

A.        Queries

B.        Domains✔

C.        Relations

D.        All of the above

 The term "TCL" stands for_____.

A.        Ternary Control Language

B.        Transmission Control Language

C.        Transaction Central Language

D.        Transaction Control Language✔

 In the relational table, which of the following can also be represented by the term "attribute"?

A.        Entity

B.        Row

C.        Column✔

D.        Both B &C

 Which of the following refers to the number of attributes in a relation?

A.        Degree✔

B.        Row

C.        Column

D.        All of the above

 Which of the following is used in the application programs to request data from the database management system?

A.        Data Manipulation language✔

B.        Data Definition Language

C.        Data Control Language

D.        All of the above

 Which one of the following command is used to delete the existing row in a table?

A.        Delete✔

B.        Update

C.        Insert

D.        None of the above

 Which one of the following commands is used for removing (or deleting) a relation forms the SQL database?

A.        Delete

B.        Drop✔

C.        Remove

D.        All of the above

 Which one of the following commands is used to restore the database to the last committed state?

A.        Savepoint

B.        Rollback✔

C.        Commit

D.        Both A & B

 The database management system can be considered as the collection of ______ that enables us to create and maintain the database.

A.        Translators

B.        Programs✔

C.        Keys

D.        Language activity

 The term "DFD" stands for?

A.        Data file diagram

B.        Data flow document

C.        Data flow diagram✔

D.        None of the above

 Which of the following refers collection of the information stored in a database at a specific time?

A.        Independence

B.        Instance of the database✔

C.        Schema

D.        Data domain

The term "SQL" stands for

A.        Standard query language

B.        Sequential query language

C.        Structured query language✔

D.        Server-side query language

 What is the relation calculus?

A.        It is a kind of procedural language

B.        It is a non-procedural language✔

C.        It is a high-level language

D.        It is Data Definition language

 Which one of the following refers to the total view of the database content?

A.        Conceptual view✔

B.        Physical view

C.        Internal view

D.        External view

 For what purpose the DML is provided?

A.        Addition of new structure in the database

B.        Manipulation & processing of the database✔

C.        Definition of the physical structure of the database system

D.        All of the above

 The term "ODBC" stands for_____

A.        Oral database connectivity

B.        Oracle database connectivity

C.        Open database connectivity✔

D.        Object database connectivity

 The architecture of a database can be viewed as the ________

A.        One level

B.        Two-level

C.        Three-level✔

D.        Four level

 In the relation model, the relation are generally termed as ________

A.        Tuples

B.        Attributes

C.        Rows

D.        Tables✔

 The Database Management Query language is generally designed for the _____

A.        Support end-users who use English like commands

B.        Specifying the structure of the database

C.        Support in the development of the complex applications software

D.        All of the above✔

 Which of the following keys is generally used to represents the relationships between the tables?

A.        Primary key

B.        Foreign key✔

C.        Secondary key

D.        None of the above

 Which of the following levels is considered as the level closed to the end-users?

A.        Internal Level

B.        External Level✔

C.        Conceptual Level

D.        Physical Level

A computer security protocol for logging-in can be considered as the example of the ______ component of an information system.

A.        Data

B.        Software

C.        Procedure✔

D.        Hardware

 Which one of the following keyword is used to find out the number of values in a column?

A.        TOTAL

B.        COUNT✔

C.        SUM

D.        ADD

 Which one of the following is commonly used to define the overall design of the database?

A.        Application program

B.        Data definition language

C.        Schema✔

D.        Source code

 Which one of the following commands is used to modify a column inside a table?

A.        Drop

B.        Update

C.        Alter✔

D.        Set