Important Data Base Management Science Set 1

Read important Data Base Management Science MCQS For Exam.These General Knowledge Mcqs Contain  of World technology,  Science & Literature, events Mcqs, Data Base Management Science Mcqs and International Organizations. These general knowledge questions are very important for all type of exams.

Note: The bold option is the right answer for the given MCQ’S:

2.Relational calculus is a
(A) Procedural language.

(B) Non- Procedural language.
(C) Data definition language.

(D) High level language.

3. The view of total database content is
(A) Conceptual view.

(B) Internal view.
(C) External view.

(D) Physical View.

4 .Cartesian product in relational algebra is
(A) a Unary operator.

B) a Binary operator.
(C) a Ternary operator.

(D) not defined.

5. 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

6. ‘AS’ clause is used in SQL for
(A) Selection operation.

(B) Rename operation.
(C) Join operation.

(D) Projection operation

Q.7 ODBC stands for
(A) Object Database Connectivity.
(B) Oral Database Connectivity.
(C) Oracle Database Connectivity.
(D) Open Database Connectivity.

Q.8 Architecture of the database can be viewed as
(A) two levels.

(B) four levels.
(C) three levels.

(D) one level.

Q.9 In a relational model, relations are termed as
(A) Tuples.

(B) Attributes
(C) Tables.

(D) Rows.

Q.10 The database schema is written in



Q.11 In the architecture of a database system external level is the
(A) physical level.

(B) logical level.
(C) conceptual level

(D) view level.

Q.12 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.

Q.13 In a Hierarchical model records are organized as
(A) Graph.

(B) List.
(C) Links

 (D) Tree.

Q.14 In an E-R diagram attributes are represented by
(A) rectangle.

(B) square.
(C) ellipse.

(D) triangle.

Q.15 In case of entity integrity, the primary key may be

(A) not Null

(B) Null
(C) both Null & not Null.

(D) any value.

Q.16 In tuple relational calculus P1 ®P2 is equivalent to
(A) ¬P1 Ú P2

(B) P1 Ú P2
(C) P1 Ù P2 (D) P1 Ù¬P2

Q.17 The language used in application programs to request data from the DBMS is referred
to as the



Q.18 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)

Q.19 Related fields in a database are grouped to form a
(A) data file

(B) data record.
(C) menu.

(D) bank.

Q.20 The database environment has all of the following components except:
(A) users.

(B) separate files.
(C) database.

(D) database administrator.

Q.21 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.

22.In an E-R diagram an entity set is represent by a
(A) rectangle.

(B) ellipse.
(C) diamond box

(D) circle.


23. _______ produces the relation that has attributes of R1 and R2
(A) Cartesian product

(B) Difference
(C) Intersection

D) Product

24. A report generator is used to
(A) update files

(B) print files on paper.
(C) data entry.

(D) delete files.

25. 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.

26. 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

27. A relational database developer refers to a record as
(A) a criteria.

(B) a relation.
(C) a tuple.

(D) an attribute.

28. 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.

29. 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.

30. DBMS helps achieve
(A) Data independence

(B) Centralized control of data
(C) Neither (A) nor (B)

(D) both (A) and (B)

31. A subschema expresses
(A) the logical view.

(B) the physical view.
(C) the external view.

(D) all of the above.

32. Count function in SQL returns the number of
(A) values.

(B) distinct values.
(C) groups.

(D) columns.

33. Which one of the following statements is false?
(A) The data dictionary is normally maintained by the database
(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.

34.Which of the following are the properties of entities?
(A) Groups

(B) Table
(C) Attributes

(D) Switchboards

Q.35 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.

36. 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.

37. 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.

38. The method of access which uses key trAnsformation is known as
(A) direct.

(B) hash.
(C) random.

(D) sequential.

39. 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.

40. The statement in SQL which allows to change the definition of a table is
(A) Alter.

(B) Update.
(C) Create.

(D) select.

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

Q.42 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.

43. 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.

44. What is a relationship called when it is maintained between two entities?
(A) Unary

(B) Binary
(C) Ternary

(D) Quaternary

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


(D) All of the above

46. The RDBMS terminology for a row is

(A) tuple.

(B) relation.
(C) attribute.

( D) degree.

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


(D) All of the above

48 .The full form of DDL is
(A Dynamic Data Language

(B) Detailed Data Language
(C) Data Definition Language

(D) Data Derivation Language

49. 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

50. 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.

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