Professional Knowledge Quiz

Q.1 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


Q.2 Which of the following is record based logical model?
(A) Network Model
(B) Object oriented model
(C) E-R Model
(D) None of these

Q.3 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.

Q.4 A file manipulation command that extracts some of the records from a file is called
(A) SELECT
(B) PROJECT
(C) JOIN
(D) PRODUCT

Q.5 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.

Q.6 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))

Q.7 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.

Q.8 In E-R Diagram derived attribute are represented by
(A) Ellipse
(B) Dashed ellipse
(C) Rectangle
(D) Triangle

Q.9 Cross Product is a:
(A) U nary Operator
(B) Ternary Operator
(C) Binary Operator
(D) Not an operator

Q.10 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)

Q.11 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)

Q.12 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

Q.13 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.

Q.14 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.

Q.15 In E-R Diagram relationship type is represented by
(A) Ellipse
(B) Dashed ellipse
(C) Rectangle
(D) Diamond


ANSWERS:
Ans 1: D
Ans 2: A
Ans 3: D
Ans 4: A
Ans 5: B
Ans 6: A
Ans 7: A
Ans 8: B
Ans 9: C
Ans 10: B
Ans 11: A
Ans 12: D
Ans 13: C
Ans 14: A
Ans 15: D

Professional Knowledge Quiz

Q.1 A relational database developer refers to a record as
(A) a criteria.
(B) a relation.
(C) a tuple.
(D) an attribute.


Q.2 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.

Q.3 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.

Q.4 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.

Q.5 A subschema expresses
(A) the logical view.
(B) the physical view.
(C) the external view.
(D) all of the above.

Q.6 Count function in SQL returns the number of
(A) values.
(B) distinct values.
(C) groups.
(D) columns.

Q.7 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.

Q.8 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.

Q.9 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.

Q.10 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.

Q.11 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.

Q.12 The method of access which uses key transformation is known as
(A) direct.
(B) hash.
(C) random.
(D) sequential.




ANSWERS:
Ans 1: C
Ans 2: B
Ans 3:C
Ans 4: A
Ans 5: C
Ans 6: A
Ans 7: B
Ans 8: C
Ans 9: D
Ans 10: C
Ans 11: B
Ans 12: B

Professional Knowledge Quiz

Q.1 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.


Q.2 In an E-R diagram an entity set is represent by a
(A) rectangle.
(B) ellipse.
(C) diamond box.
(D) circle.

Q.3 A report generator is used to
(A) update files.
(B) print files on paper.
(C) data entry.
(D) delete files.

Q.4 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.

Q.5 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.

Q.6 A relational database developer refers to a record as
(A) a criteria.
(B) a relation.
(C) a tuple.
(D) an attribute.

Q.7 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.

Q.8 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.

Q.9 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.

Q.10 A subschema expresses
(A) the logical view.
(B) the physical view.
(C) the external view.
(D) all of the above.

Q.11 Count function in SQL returns the number of
(A) values.
(B) distinct values.
(C) groups.
(D) columns.

Q.12 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.

Q.13 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.

Q.14 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.

Q.15 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.

Q.16 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.

Q.17 The method of access which uses key transformation is known as
(A) direct.
(B) hash.
(C) random.
(D) sequential.

Q.18 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).

Q.19 The statement in SQL which allows to change the definition of a table is
(A) Alter.
(B) Update.
(C) Create.
(D) select.

Q.20 E-R model uses this symbol to represent weak entity set ?
(A) Dotted rectangle.
(B) Diamond
(C) Doubly outlined rectangle
(D) None of these

ANSWERS:

Ans1: D

Ans2: A

Ans3: B

Ans4: D

Ans5: B

Ans6: C

Ans7: B

Ans8: C

Ans9: A 

Ans10 : C 

Ans11 : A 

Ans12 : B

Ans13 : C

Ans14 : D

Ans15 : C

Ans16 : B

Ans17 : B

Ans18 : D both (B) and (C)

Ans19 : A

Ans20 : C