TYPICAL QUESTIONS & ANSWERS OBJECTIVE TYPE QUESTIONS
13 vues 0 fois vendu
Cours
DATABASE MANAGEMENT SYSTEMS
Établissement
DATABASE MANAGEMENT SYSTEMS
TYPICAL QUESTIONS & ANSWERS
OBJECTIVE TYPE QUESTIONS
Each question carries 2 marks.
Choose the correct or best alternative in the following:
Q.1 In the relational modes, cardinality is termed as:
(A) Number of tuples. (B) Number of attributes.
(C) Number of tables. (D) ...
Choose the correct or best alternative in the following:
Q.1 In the relational modes, cardinality is termed as:
(A) Number of tuples. (B) Number of attributes.
(C) Number of tables. (D) Number of constraints.
Ans: A
Q.2 Relational calculus is a
(A) Procedural language. (B) Non- Procedural language.
(C) Data definition language. (D) High level language.
Ans: B
Q.3 The view of total database content is
(A) Conceptual view. (B) Internal view.
(C) External view. (D) Physical View.
Ans: A
Q.4 Cartesian product in relational algebra is
(A) a Unary operator. (B) a Binary operator.
(C) a Ternary operator. (D) not defined.
Ans: B Cartesian product in relational algebra is a binary operator.
(It requires two operands. e.g., P X Q)
Q.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.
Ans: C DML is provided for manipulation & processing of database.
(Data stored in the database is processed or manipulated using data manipulation
language commands as its name)
1
,DC10 DATABASE MANAGEMENT SYSTEMS
Q.6 ‘AS’ clause is used in SQL for
(A) Selection operation. (B) Rename operation.
(C) Join operation. (D) Projection operation.
Ans: B ‘AS’ clause is used in SQL for rename operation.
(e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
Q.7 ODBC stands for
(A) Object Database Connectivity.
(B) Oral Database Connectivity.
(C) Oracle Database Connectivity.
(D) Open Database Connectivity.
Ans: D
Q.8 Architecture of the database can be viewed as
(A) two levels. (B) four levels.
(C) three levels. (D) one level.
Ans: C
Q.9 In a relational model, relations are termed as
(A) Tuples. (B) Attributes
(C) Tables. (D) Rows.
Ans:
Q.10 The database schema is written in
(A) HLL (B) DML
(C) DDL (D) DCL
Ans: C
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.
Ans: D
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.
Ans: B
Q.13 In a Hierarchical model records are organized as
(A) Graph. (B) List.
(C) Links. (D) Tree.
2
,DC10 DATABASE MANAGEMENT SYSTEMS
Ans: D
Q.14 In an E-R diagram attributes are represented by
(A) rectangle. (B) square.
(C) ellipse. (D) triangle.
Ans: C
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.
Ans: A
Q.16 In tuple relational calculus P1 → P2 is equivalent to
(A) ¬P1 ∨ P2 (B) P1 ∨ P2
(C) P1 ∧ P2 (D) P1 ∧ ¬P2
Ans: A In tuple relational calculus P1 P2 is equivalent to ¬P1 ∨ P2.
(The logical implication expression A B, meaning if A then B,is equivalent to ¬A ∨ B)
Q.17 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
Ans: A
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)
Ans: A
Q.19 Related fields in a database are grouped to form a
(A) data file. (B) data record.
(C) menu. (D) bank.
Ans: B Related data fields in a database are grouped to form a data record.
(A record is a collection of related fields)
Q.20 The database environment has all of the following components except:
(A) users. (B) separate files.
(C) database. (D) database administrator.
Ans: A
3
, DC10 DATABASE MANAGEMENT SYSTEMS
Q.21 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.
Ans: B
Q.22 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.
Ans: D
Q.23 In an E-R diagram an entity set is represent by a
(A) rectangle. (B) ellipse.
(C) diamond box. (D) circle.
Ans: A
Q.24 A report generator is used to
(A) update files. (B) print files on paper.
(C) data entry. (D) delete files.
Ans: B
Q.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.
Ans: D
Q.26 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.
Ans: B
Q.27 A relational database developer refers to a record as
(A) a criteria. (B) a relation.
(C) a tuple. (D) an attribute.
Ans: C
Q.28 The relational model feature is that there
4
Les avantages d'acheter des résumés chez Stuvia:
Qualité garantie par les avis des clients
Les clients de Stuvia ont évalués plus de 700 000 résumés. C'est comme ça que vous savez que vous achetez les meilleurs documents.
L’achat facile et rapide
Vous pouvez payer rapidement avec iDeal, carte de crédit ou Stuvia-crédit pour les résumés. Il n'y a pas d'adhésion nécessaire.
Focus sur l’essentiel
Vos camarades écrivent eux-mêmes les notes d’étude, c’est pourquoi les documents sont toujours fiables et à jour. Cela garantit que vous arrivez rapidement au coeur du matériel.
Foire aux questions
Qu'est-ce que j'obtiens en achetant ce document ?
Vous obtenez un PDF, disponible immédiatement après votre achat. Le document acheté est accessible à tout moment, n'importe où et indéfiniment via votre profil.
Garantie de remboursement : comment ça marche ?
Notre garantie de satisfaction garantit que vous trouverez toujours un document d'étude qui vous convient. Vous remplissez un formulaire et notre équipe du service client s'occupe du reste.
Auprès de qui est-ce que j'achète ce résumé ?
Stuvia est une place de marché. Alors, vous n'achetez donc pas ce document chez nous, mais auprès du vendeur TIFFACADEMICS. Stuvia facilite les paiements au vendeur.
Est-ce que j'aurai un abonnement?
Non, vous n'achetez ce résumé que pour €19,52. Vous n'êtes lié à rien après votre achat.
