Tuesday, May 27, 2014
DBMS OBJECTIVE QUESTIONS SET 3
Choose the correct or the best
alternative in the following:
Q.1 Which of the following relational algebra
operations do not require the participating
tables to be
union-compatible?
(A)Union (B)
Intersection
(C) Difference (D)
Join
Ans: (D)
Q.2 Which of the following is not a property of
transactions?
(A) Atomicity (B)Concurrency
(C) Isolation (D)
Durability
Ans: (B)
Q.3 Relational Algebra does not have
(A) Selection
operator. (B) Projection operator.
(C) Aggregation
operators. (D) Division operator.
Ans: (C )
Q.4 Checkpoints are a part of
(A) Recovery
measures. (B) Security measures.
(C ) Concurrency
measures. (D)Authorization measures.
Ans: (A)
Q.5 Tree structures are used to store data in
(A) Network
model. (B) Relational model.
(C)Hierarchical model. (D)
File based system.
Ans: (C )
Q.6 The language that requires a user to specify
the data to be retrieved without specifying
exactly how to get it
is
(A) Procedural
DML. (B)
Non-Procedural DML.
(C)Procedural DDL.
(D) Non-Procedural DDL.
Ans: (B)
Q.7 Precedence graphs help to find a
(A) Serializable schedule. (B)
Recoverable schedule.
(C) Deadlock free
schedule. (D) Cascadeless schedule.
Ans: (A)
Q.8 The rule that a value of a foreign key must
appear as a value of some specific table
is
called a
(A)Referential constraint.
(B) Index.
(C) Integrity
constraint. (D) Functional dependency.
Ans: (A) The rule
that a value of a foreign key must appear
as a value of some specific
table is called a referential constraint. (Referential
integrity constraint is concerned with
foreign key)
Q.9 The clause in SQL that specifies that the
query result should be sorted in ascending or
descending order
based on the values of one or more columns is
(A)View (B) Order by
(C) Group by (D)
Having
Ans: (B) The clause
in SQL that specifies that the query result should be sorted in
ascending or descending order based on the values of one or
more columns is ORDER
BY. (ORDER BY clause is used to arrange the result of the
SELECT statement)
Q.10 What is a disjoint less constraint?
(A) It requires that
an entity belongs to no more than one level entity set.
(B) The same entity
may belong to more than one level.
(C)The database must contain an unmatched foreign keyvalue.
(D) An entity can be
joined with another entity in the same level entity set.
Ans: (A) Disjoint less constraint requires that an entity
belongs to no more than one level
entity set. (Disjoint less constraint means that anentity
can be a member of at most one of
the subclasses of the specialization.)
Q.11 According to the levels of abstraction, the
schema at the intermediate level is called
(A) Logical
schema. (B) Physical schema.
(C) Subschema. (D)
Super schema.
Ans: According to the levels of abstraction, the schema at
the intermediate level is called
conceptual schema.
(Note:All the options given in the question are wrong.)
Q.12 It is an abstraction through which
relationships are treated as higher level entities
(A)
Generalization. (B) Specialization.
(C) Aggregation. (D)
Inheritance.
Ans: (C ) It is an
abstraction through which relationships are treated as higher level
entities Aggregation. (In ER diagram, aggregation is used to
represent a relationship as an
entity set.)
Q.13 A relation is in ____________ if an attribute
of acomposite key is dependent on an
attribute of other
composite key.
(A) 2NF (B)
3NF
(C) BCNF (D)
1NF
Ans: (B) A relation
is in 3 NF if an attribute of a composite key is dependent on an
attribute of other composite key. (If an attribute of a composite key is dependent on an
attribute of other composite key then the relation is not in BCNF, hence it has to be
decomposed.)
Q.14 What is data
integrity?
(A) It is the data
contained in database that is non redundant.
(B) It is the data
contained in database that is accurate and consistent.
(C) It is the data
contained in database that is secured.
(D) It is the data
contained in database that is shared.
Ans: (B) (Data
integrity means that the data must be valid according to the given
constraints. Therefore, the data is accurate and consistent.)
Q.15 What are the desirable properties of a
decomposition
(A) Partition
constraint. (B) Dependency preservation.
(C) Redundancy. (D)
Security.
Ans: (B) What are the desirable properties of a
decomposition – dependency preserving.
(Lossless join and dependency preserving are the two goals
of the decomposition.)
Q.16 In an E-R diagram double lines indicate
(A)Total participation.(B)
Multiple participation.
(C) Cardinality
N. (D)None of the above.
Ans: (A)
Q.17 The operation
which is not considered a basic operation of relational algebra is
(A) Join. (B)Selection.
(C) Union. (D)
Cross product.
Ans: (A)
Q.18 Fifth Normal
form is concerned with
(A) Functional
dependency. (B) Multivalued dependency.
(C)Join dependency.
(D)Domain-key.
Ans: (C)
Q.19 Block-interleaved distributed parity is RAID
level
(A) 2. (B) 3
(C) 4. (D) 5.
Ans: (D)
Q.20 Immediate database modification technique
uses
(A)Both undo and redo.
(B)Undo but no redo.
(C)Redo but no undo.
(D)Neither undo nor redo.
Ans: (A)
Q.21 In SQL the statement select * from R, Sis
equivalent to
(A) Select * from R
natural join S. (B) Select * from R cross join S.
(C) Select * from R
union join S. (D) Select * from R inner join S.
Ans: (B)
Q.22 Which of the following is not a consequence
of concurrent operations?
(A) Lost update
problem. (B) Update anomaly.
(C)Unrepeatable read.
(D) Dirty read.
Ans: (B)
Q.23 As per equivalence rules for query
transformation, selection operation distributes over
(A) Union. (B)
Intersection.
(C) Set
difference. (D) All of the above.
Ans: (D)
Q.24 The metadata is created by the
(A)DML compiler
(B) DML pre-processor
(C) DDL
interpreter (D) Query interpreter
Ans: (C)
Q.25 When an E-R diagram is mapped to tables, the
representation is redundant for
(A) weak entity
sets (B)weak relationship sets
(C)strong entity sets
(D)strong relationship sets
Ans: (B)
Q.26 When φ
= ∩ S R , then the cost of computing S R
< > is
(A) the same as
R × S
(B)greater the R × S
(C)less than R ×
S (D)cannot say anything
Ans: (A)
Q.27 In SQL the word
‘natural’ can be used with
(A) inner join (B)full outer join
(C)right outer join
(D)all of the above
Ans: (A)
Q.28 The default
level of consistency in SQL is
(A) repeatable read
(B) read committed
(C) read
uncommitted (D)serializable
Ans: (D)
Q.29 If a transaction
T has obtained an exclusive lock on item Q, then T can
(A) read Q (B)write Q
(C)both read and write Q
(D)write Q but not read Q
Ans: (C)
Q.30 Shadow paging
has
(A)no redo (B)no undo
(C)redo but no undo
(D)neither redo nor undo
Ans: (A)
Q.31 If the closure
of an attribute set is the entire relation then the attribute set is a
(A) superkey (B)candidate key
(C) primary key (D)
not a key
Ans: (A)
Q.32 DROP is a
______________ statement in SQL.
(A) Query (B)Embedded SQL
(C) DDL (D)
DCL
Ans: (C)
Q.33 If two relations
R and S are joined, then the non
matching tuples of both R and S are
ignored in
(A) left outer
join (B)right outer join
(C)full outer join
(D) inner join
Ans: (D)
Q.34 The keyword to eliminate duplicate rows from
the query result in SQL is
(A) DISTINCT (B) NO
DUPLICATE
(C) UNIQUE (D)
None of the above
` Ans: (C)
Q.35 In 2NF
(A) No functional
dependencies (FDs) exist.
(B) No multivalued
dependencies (MVDs) exist.
(C)No partial FDs exist.
(D)No partial MVDs exist.
Ans: (C)
Q.36 Which one is correct statement?
Logical data
independence provides following without changing application programs:
(i)Changes in access methods.
(ii)Adding new entities in database
(iii)Splitting an existing record into two or more records
(iv)Changing storage medium
(A)(i) and (ii)
(B)(iv) only, (C)(i) and (iv) (D)(ii) and (iii)
Ans: (D)
Q.37 In an E-R, Y is
the dominant entity and X is a subordinate entity. Then which of the
following is
incorrect :
(A)Operationally, if Y is deleted, so is X
(B)existence is dependent on Y.
(C)Operationally, if X is deleted, so is Y.
(D) Operationally, if
X is deleted, & remains the same.
Ans: (C)
Q.38 Relational
Algebra is
(A) Data Definition
Language .
(B) Meta Language
(C) Procedural query
Language
(D) None of the above
Ans: (C)
Q.39 Which of the
following aggregate functions does not ignore nulls in its results?.
(A)COUNT . (B) COUNT (*)
(C) MAX (D) MIN
Ans: (B)
Q.41 Consider the
join of relation R with a relation S.If R has m tuples and S has n
tuples, then the
maximum and minimum size of the join respectively are
(A)m+n and 0 (B)m+n
and |m-n|
(C) mn and 0 (D) mn
and m+n
Ans: (C)
Q.42 Maximum height
of a B+ tree of order m with n key values is
(A) Logm(n) (B)(m+n)/2
(C)Logm/2(m+n)
(D)None of these
Ans: (D)
Q.43 Which one is
true statement :
(A)With finer degree of granularity of locking a highdegree
of concurrency is
possible.
(B)Locking prevents non – serializable schedules.
(C)Locking cannot take place at field level.
(D)An exclusive lock on data item X is granted even if a
shared lock is already
held on X.
Ans: (A)
Q.44 Which of the
following statement on the view concept in SQL is invalid?
(A)All views are not updateable
(B)The views may be referenced in an SQL statement whenever
tables are
referenced.
(C)The views are instantiated at the time they are
referenced and not when they
are defined.
(D)The definition of a view should not have GROUP BY clause
in it.
Ans: (D)
Q.45 Which of the
following concurrency control schemesis not based on the
serializability
property?
(A)Two – phase locking
(B) Graph-based locking
(C)Time-stamp based locking
(D) None of these .
Ans: (D)
Q.46 Which of the following is a reason to model
data?
(A) Understand each
user’s perspective of data
(B) Understand the
data itself irrespective of the physical representation
(C)Understand the use of data across application areas
(D)All of the above
Ans: (D)
Q.47 If an entity can
belong to only one lower level entity then the constraint is
(A)disjoint
(B)partial
(C) overlapping (D)single
Ans: (B)
Q.48 The common
column is eliminated in
(A)theta join
(B)outer join (C)natural
join (D)composed join
Ans: (C )
Q.49 In SQL, testing
whether a sub query is empty is done using
(A)DISTINCT (B)UNIQUE
(C)NULL (D)EXISTS
Ans: (D)
Q.50 Use of UNIQUE while
defining an attribute of a table in SQL means that the attribute
values are
(A) distinct
values (B) cannot have NULL
(C) both (A)&
(B) (D)same as primary key
Ans: (C)
Q.51 The cost of
reading and writing temporary files while evaluating a query can be reduced
by
(A) building
indices (B)pipelining
(C)join ordering
(D) none of the above
Ans: (B)
Q.52A transaction is
in __________ state after the final statement has been executed.
(A) partially
committed (B)active
(C)committed (D)none
of the above
Ans: (C)
Q.53 In multiple
granularity of locks SIX lock is compatible with
(A) IX (B)IS
(C) S (D)
SIX
Ans: (B)
Q.54 The statement
that is executed automatically by the system as a side effect of the
modification of the
database is
(A) backup (B)assertion
(C) recovery (D) trigger
Ans: (D)
Q.55 The normal form
that is not necessarily dependency preserving is
(A) 2NF (B)3NF
(C) BCNF (D)
4NF
Ans: (A)
Q.56 A functional dependency of the form y x → is trivial if
(A) x y ⊆
(B) x y ⊂
(C) y x ⊆ (D) y
x ⊂
Ans: (A)
Q.57 The normalization was first proposed by
______________.
(A) Code (B)Codd
(C) Boyce Codd (D)Boyce
Ans: (B)
Q.58 The division
operator divides a dividend A of degree m+n by a divisor relation B of
degree n and produces
a result of degree
(A) m – 1 (B)m + 1
(C) m * m (D) m
Ans: (D)
Q.59 Which of the
following is not a characteristic of a relational database model?
(A) Table (B)Tree like structure
(C)Complex logical relationship (D)Records
Ans: (B)
Q.60 Assume
transaction A holds a shared lock R. If transaction B also requests for a
shared
lock on R.
(A)It will result in a deadlock situation.
(B)It will immediately be rejected.
(C)It will immediately be granted.
(D)It will be granted as soon as it is released by A .
Ans: (C)
Q.61 In E-R Diagram
total participation is represented by
(A)double lines
(B)Dashed lines
(C)single line
(D) Triangle
Ans: (A)
Q.62 The FD A →B , DB
→C implies
(A)DA →C (B)A →C
(C)B →A (D)DB →A
Ans: (A)
Q.63 The graphical
representation of a query is ________.
(A)B-Tree (B)graph
(C)Query Tree
(D)directed graph
Ans: (C)
Q.64 Union operator
is a :
(A)Unary Operator
(B)Ternary Operator
(C)Binary Operator
(D)Not an operator
Ans: (C)
Q.65 Relations
produced from an E-R model will always be
(A)First normal form.
(B)Second normal form.
(C)Third normal form.
(D)Fourth normal form.
Ans: (A)
Q.66 Manager salary
details are hidden from the employee .This is
(A)Conceptual level data hiding.
(B)External level data hiding.
(C)Physical level data hiding.
(D)None of these.
Ans: (A)
Q.67 Which of the
following is true for network structure?
(A) It is a physical
representation of the data.
(B) It allows many to
many relationship.
(C) It is
conceptually simple.
(D) It will be the
dominant database of the future.
Ans: (A)
Q.68 Which two files
are used during operation of the DBMS?
(A)Query languages and utilities
(B) DML and query
language
(C)Data dictionary and transaction log
(D)Data dictionary and query language
Ans: (C )
Q.69 A list consists
of last names, first names, addresses and pin codes. If all people in the
list have the same
last name and same pin code a useful key would be
(A) the pin code
(B) the last name
(C) the compound key
first name and last name
(D) Tr from next page
Ans: (C )
Q.70 In b-tree the
number of keys in each node is ____ than the number of its children.
(A) one less (B)same
(C) one more (D)half
Ans: (A)
Q.71 The drawback of
shadow paging technique are
(A) Commit
overhead (B)Data fragmentation
(C) Garbage
collection (D) All of these
Ans: (D)
Q.72 Which normal
form is considered adequate for normal relational database design?
(A) 2NF (B)5NF
(C) 4NF (D)3NF
Ans: (D)
Q.73 Which of the
following addressing modes permits relocation without any change over
in the code?
(A) Indirect
addressing (B)Indexed addressing
(C) PC relative
addressing (D)Base register addressing
Ans: (B)
Q.74 In a multi-user
database, if two users wish to update the same record at the same time,
they are prevented
from doing so by
(A) jamming (B)password
(C)
documentation (D)record lock
Ans: (D)
Q.75 The values of the attribute describes a
particular_____________
(A) Entity set (B)File
(C)Entity instance
(D) Organization
Ans: (C)
Q.76 Which of the following relational algebraic
operations is not from set theory?
(A)Union
(B)Intersection
(C)Cartesian Product
(D) Select
Ans: (D)
Q.77 Which of the following ensures the atomicity
of thetransaction?
(A)Transaction management component of DBMS
(B)Application Programmer
(C)Concurrency control component of DBMS
(D)Recovery management component of DBMS
Ans: (A)
Q.78 If both the
functional dependencies : X→Y and Y→X hold for two attributes X and Y
then the relationship
between X and Y is
(A)M:N (B)M:1
(C)1:1 (D)1:M
Ans: (C)
Q.79 What will be the number of columns and rows
respectively obtained for the operation, A-
B, if A B are Base
union compatible and all the rows of a are common to B? Assume A
has 4 columns and 10
rows; and B has 4 columns and 15 rows
(A) 4,0 (B)0,0
(C) 4,5(D) 8,5
Ans: (A)
Q.80 For correct behaviour during recovery, undo
and redo operation must be
(A)Commutative
(B)Associative
(C)idempotent
(D)distributive
Ans: (C)
Q.81 Which of the
following is not a consequence of non-normalized database?
(A)Update Anomaly
(B)Insertion Anomaly
(C)Redundancy (D)Lost
update problem
Ans: (D)
Q.82 Which of the following is true for relational
calculus?
(A) ∀x(P(x))≡¬(∃x)(¬P(x)) (B) ∀x(P(x))≡¬(∃x)(P(x))
(C) ∀x(P(x))≡(∃x)(¬P(x)) (D) ∀x(P(x))≡(∃x)(P(x))
Ans: (A)
Q.83 The part of a database management system
which ensures that the data remains in a
consistent state is
(A) authorization and
integrity manager
(B) buffer manager
(C) transaction
manager
(D) file manager
Ans: (C)
Q.84 Relationships among relationships can be
represented in an-E-R model using
(A)Aggregation
(B) Association
(C)Weak entity sets
(D)Weak relationship sets
Ans: (A)
Q.85 In tuple
relational calculus P1 AND P2 is equivalent to
(A) (¬P1OR¬P2). (B)
¬(P1OR¬P2).
(C) ¬(¬P1OR P2). (D)
¬(¬P1OR ¬P2).
Ans: (D)
Q.86 If α→βholds then so does
(A) γα→γβ (B)
α→→γβ
(C)both (A) and (B)
(D)None of the above
Ans: (A)
Q.87 Cascading rollback is avoided in all protocol
except
(A) strict two-phase
locking protocol.
(B)tree locking protocol
(C)two-phase locking protocol
(D)validation based protocol.
Ans: (D)
Q. 88 Wait-for graph is used for
(A)detecting view serializability. (B)detecting conflict serializability.
(C)deadlock prevention
(D)deadlock detection
Ans: (D)
Q.90 The clausealter table in SQL can be used to
(A) add an attribute
(B) delete an
attribute
(C) alter the default
values of an attribute
(D) all of the above
Ans: (D)
Q. 91 The data models defined by ANSI/SPARC
architecture are
(A) Conceptual,
physical and internal
(B) Conceptual, view
and external
(C)Logical, physical and internal
(D) Logical, physical
and view
Ans: (D)
Q.92Whenever two
independent one-to-many relationshipsare mixed in the same relation, a
_______ arises.
(A)Functional dependency
(B)Multi-valued dependency
(C) Transitive dependency (D)
Partial dependency
Ans:(B)
Q.93 A table can have only one
(A)Secondary key
(B)Alternate key
(C)Unique key
(D)Primary key
Ans: (D)
Q.94 Dependency
preservation is not guaranteed in
(A)BCNF (B)3NF
(C)PJNF (D)DKNF
Ans: (A)
Q.95 Which is the
best file organization when data is frequently added or deleted from a file?
(A)Sequential
(B)Direct
(C)Index sequential
(D)None of the above
Ans: (B)
Q.96 Which of the
following constitutes a basic set of operations for manipulating relational
data?
(A)Predicate calculus
(B)Relational calculus
(C)Relational algebra
(D)SQL
Ans: (C)
Q.97 An advantage of
views is
(A)Data security
(B)Derived columns
(C)Hiding of complex queries
(D)All of the above
Ans: (A)
Q.98 Which of the following is not a recovery
technique?
(A)Deferred update
(B)Immediate update
(C)Two-phase commit
(D) Shadow paging
Ans: (C)
Q.99 Isolation of the transactions is ensured by
(A)Transaction management
(B)Application programmer
(C) Concurrency
control (D) Recovery management
Ans: (C)
Q.100 _______ operator is used to compare a value to
a list of literals values that have been
specified.
(A) Like (B)COMPARE
(C) BETWEEN (D) IN
Ans: (A)
Thanks For Viewing , Any comments or suggestions Are welcomed.
Thanks For Viewing , Any comments or suggestions Are welcomed.
DBMS OBJECTIVE QUESTIONS SET 2
DBMS OBJECTIVE QUESTIONS MODEL 2
model 1@http://mytrickopedia.blogspot.com/2014/05/database-management-system-multiple.html
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 binaryoperator.
(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.
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.
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
P P → is equivalent to
(A)
P P ∨ ¬
(B)
P P ∨
(C)
P P ∧
(D)
P P ¬ ∧
Ans: A In tuple relational calculus P
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
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
(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.
Ans: B
Q.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.
Ans:C
Q.30 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.
Ans: A A method in which records are physically stored in a specified order according
to a key field in each record is hash.
(In hash method, a hash function is performed on the key value to determine the
unique physical address of the record to store or retrieve)
Q.31 A subschema expresses
(A) the logical view. (B)the physical view.
(C)the external view. (D)all of the above.
Ans: C A subschema expresses the external view.
(External schemas are called also called as subschemas)
Q.32 Count function in SQL returns the number of
(A)values. (B) distinct values.
(C)groups. (D)columns.
Ans: A Count function in SQL returns the number of values.
(Count function counts all the not null values inthe specific column. If we want to
count only distinct values than the DISTINCT keyword is also to be used)
Q.33Which one of the following statements is false?
(A)The data dictionary is normally maintained by thedatabase
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.
Ans: B
Q.34An 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.
Ans: C
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.
Ans: D
Q.36Transaction 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.
Ans: C
Q.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.
Ans: B
Q.38 The method of access which uses key transformation is known as
(A) direct.(B)hash.
(C) random.(D) sequential.
Ans: B
Q.39 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).
Ans: D both (B) and (C)
Q.40 The statement in SQL which allows to change the definition of a table is
(A)Alter. (B)Update.
(C)Create. (D)select.
Ans: A
Q.41 E-R model uses this symbol to represent weak entityset ?
(A) Dotted rectangle.
(B) Diamond
(C) Doubly outlined rectangle
(D) None of these
Ans: C
Q.42 SET concept is used in :
(A) Network Model
(B) Hierarchical Model
(C) Relational Model
(D) None of these
Ans: A
Q.43 Relational Algebra is
(A) Data Definition Language.
(B) Meta Language
(C) Procedural query Language
(D) None of the above
Ans: C
Q.44 Key to represent relationship between tables is called
(A) Primary key(B)Secondary Key
(C)Foreign Key(D)None of these
Ans: C
Q.45 _______ produces the relation that has attributes of R1 andR2
(A) Cartesian product (B)Difference
(C)Intersection (D)Product
Ans: A
Q.46 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
Ans: C
Q.47 DBMS helps achieve
(A)Data independence (B)Centralized control of data
(C)Neither (A) nor (B) (D)both (A) and (B)
Ans: D
Q.48 Which of the following are the properties of entities?
(A) Groups (B) Table
(C)Attributes(D)Switchboards
Ans: C
Q.49 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.
Ans: C
Q.50 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 indexeson the relations
(D)None of these
Ans: D
Q.51 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.
Ans: B
Q.52 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.
Ans: D
Q.53 What is a relationship called when it is maintained between two entities?
(A) Unary(B) Binary
(C) Ternary(D) Quaternary
Ans: B
Q.54 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
Ans: A
Q.55 Which of the following is a valid SQL type?
(A) CHARACTER (B)NUMERIC
(C)FLOAT (D)All of the above
Ans: D
Q.56 The RDBMS terminology for a row is
(A) tuple.(B) relation.
(C) attribute.(D) degree.
Ans: A
Q.57 Which of the following operations need the participating relations to be union compatible?
(A) UNION (B)INTERSECTION
(C)DIFFERENCE (D)All of the above
Ans: D
Q.58 The full form of DDL is
(A Dynamic Data Language(B) Detailed Data Language
(C) Data Definition Language(D)Data Derivation Language
Ans: C
Q.59 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
Ans: D
Q.60 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
Ans: B
Q.61 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.
Ans: B
Q.62 Which database level is closest to the users?
(A) External(B) Internal
(C)Physical(D) Conceptual
Ans: A
Q.63 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
Ans: B
Q.64 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
Ans: D
Q.65 Which of the following is a comparison operator inSQL?
(A) = (B)LIKE
(C)BETWEEN (D)All of the above
Ans: D
Q.66 A set of possible data values is called
(A) attribute.(B) degree.
(C) tuple.(D) domain.
Ans: D
Q.67 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
Ans:C
Q.68 Which of the following is another name for weak entity?
(A)Child (B)Owner
(C)Dominant (D)All of the above
Ans: A
Q.69 Which of the following database object does not physically exist?
(A)base table (B)index
(C)view (D)none of the above
Ans: C
Q.70 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
Ans: D
Q.71 Which of the following is record based logical model?
(A)Network Model (B)Object oriented model
(C) E-R Model (D)None of these
Ans: A
Q.72 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.
Ans: D
Q.73 A file manipulation command that extracts some of the records from a file is called
(A) SELECT(B) PROJECT
(C)JOIN(D) PRODUCT
Ans: A
Q.74 The physical location of a record is determined bya 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.
Ans: B
Q.75 Using Relational Algebra the query that finds customers, who have a balance of over
1000 is
(A) Π Customer_name
( σ balance >1000
(Deposit))
(B) σ Customer_name
( Π balance >1000
(Deposit))
(C) Π Customer_name
( σ balance >1000
(Borrow))
(D) σ Customer_name
( Π balance >1000
(Borrow))
Ans: A
Q.76 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.
Ans: A
Q.77 In E-R Diagram derived attribute are represented by
(A) Ellipse(B) Dashed ellipse
(C)Rectangle(D) Triangle
Ans B
Q.78 Cross Product is a:
(A) Unary Operator(B) Ternary Operator
(C) Binary Operator(D) Not an operator
Ans: C
Q.79 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)
Ans: B
Q.80 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)
Ans: A
Q.81 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
Ans: D
Q.82 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.
Ans: C
Q.83 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.
Ans: A
Q.84 In E-R Diagram relationship type is represented by
(A) Ellipse(B) Dashed ellipse
(C)Rectangle(D) Diamond
Ans: D
Q.85 Hierarchical model is also called
(A) Tree structure(B) Plex Structure
(C)Normalize Structure (D)Table Structure
Ans: A
Q.86 To delete a particular column in a relation the command used is:
(A)UPDATE (B)DROP
(C)ALTER (D)DELETE
Ans: C
Q.87 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
Ans: A
Q.88 A logical schema
A) is the entire database
B) is a standard way of organizing information into a accessible part
C) describe how data is actually stored on disk
D) none of these
Ans: D
Q.89 A B-tree of order m has maximum of _____________ children
(A) m (B)m+1
(C) m-1 (D)m/2
Ans: A
Q.90 _____________ function divides one numeric expression by another and returns the
remainder.
(A)POWER (B)MOD
(C)ROUND (D)REMAINDER
Ans: B
Q.91 A data manipulation command the combines the records from one or more tables is called
(A)SELECT (B)PROJECT
(C)JOIN (D) PRODUCT
Ans: C
Q.92 In E-R diagram generalization is represented by
(A)Ellipse (B) Dashed ellipse
(C) Rectangle (D) Triangle
Ans: D
Q.93_________ is a virtual table that draws its data from the result of an SQL
SELECT statement.
(A)View (B)Synonym
(C)Sequence (D)Transaction
Ans: A
Q.94 The method of access which uses key transformation is known as
(A)Direct (B) Hash
(C)Random (D)Sequential
Ans: B
Q.95 A table joined with itself is called
(A)Join (B)Self Join
(C)Outer Join (D)Equi Join
Ans: B
Q.96_________ data type can store unstructured data
(A)RAW (B)CHAR
(C)NUMERIC (D) VARCHAR
Ans: A
Q.97 Which two files are used during operation of the DBMS
(A) Query languages and utilities
(B) DML and query language
(C) Data dictionary and transaction log
(D) Data dictionary and query language
Ans: C
Thats For NOw , More in Set 3.
Design>
model 1
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 binaryoperator.
(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.
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.
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
P P → is equivalent to
(A)
P P ∨ ¬
(B)
P P ∨
(C)
P P ∧
(D)
P P ¬ ∧
Ans: A In tuple relational calculus P
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
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
(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.
Ans: B
Q.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.
Ans:C
Q.30 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.
Ans: A A method in which records are physically stored in a specified order according
to a key field in each record is hash.
(In hash method, a hash function is performed on the key value to determine the
unique physical address of the record to store or retrieve)
Q.31 A subschema expresses
(A) the logical view. (B)the physical view.
(C)the external view. (D)all of the above.
Ans: C A subschema expresses the external view.
(External schemas are called also called as subschemas)
Q.32 Count function in SQL returns the number of
(A)values. (B) distinct values.
(C)groups. (D)columns.
Ans: A Count function in SQL returns the number of values.
(Count function counts all the not null values inthe specific column. If we want to
count only distinct values than the DISTINCT keyword is also to be used)
Q.33Which one of the following statements is false?
(A)The data dictionary is normally maintained by thedatabase
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.
Ans: B
Q.34An 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.
Ans: C
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.
Ans: D
Q.36Transaction 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.
Ans: C
Q.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.
Ans: B
Q.38 The method of access which uses key transformation is known as
(A) direct.(B)hash.
(C) random.(D) sequential.
Ans: B
Q.39 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).
Ans: D both (B) and (C)
Q.40 The statement in SQL which allows to change the definition of a table is
(A)Alter. (B)Update.
(C)Create. (D)select.
Ans: A
Q.41 E-R model uses this symbol to represent weak entityset ?
(A) Dotted rectangle.
(B) Diamond
(C) Doubly outlined rectangle
(D) None of these
Ans: C
Q.42 SET concept is used in :
(A) Network Model
(B) Hierarchical Model
(C) Relational Model
(D) None of these
Ans: A
Q.43 Relational Algebra is
(A) Data Definition Language.
(B) Meta Language
(C) Procedural query Language
(D) None of the above
Ans: C
Q.44 Key to represent relationship between tables is called
(A) Primary key(B)Secondary Key
(C)Foreign Key(D)None of these
Ans: C
Q.45 _______ produces the relation that has attributes of R1 andR2
(A) Cartesian product (B)Difference
(C)Intersection (D)Product
Ans: A
Q.46 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
Ans: C
Q.47 DBMS helps achieve
(A)Data independence (B)Centralized control of data
(C)Neither (A) nor (B) (D)both (A) and (B)
Ans: D
Q.48 Which of the following are the properties of entities?
(A) Groups (B) Table
(C)Attributes(D)Switchboards
Ans: C
Q.49 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.
Ans: C
Q.50 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 indexeson the relations
(D)None of these
Ans: D
Q.51 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.
Ans: B
Q.52 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.
Ans: D
Q.53 What is a relationship called when it is maintained between two entities?
(A) Unary(B) Binary
(C) Ternary(D) Quaternary
Ans: B
Q.54 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
Ans: A
Q.55 Which of the following is a valid SQL type?
(A) CHARACTER (B)NUMERIC
(C)FLOAT (D)All of the above
Ans: D
Q.56 The RDBMS terminology for a row is
(A) tuple.(B) relation.
(C) attribute.(D) degree.
Ans: A
Q.57 Which of the following operations need the participating relations to be union compatible?
(A) UNION (B)INTERSECTION
(C)DIFFERENCE (D)All of the above
Ans: D
Q.58 The full form of DDL is
(A Dynamic Data Language(B) Detailed Data Language
(C) Data Definition Language(D)Data Derivation Language
Ans: C
Q.59 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
Ans: D
Q.60 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
Ans: B
Q.61 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.
Ans: B
Q.62 Which database level is closest to the users?
(A) External(B) Internal
(C)Physical(D) Conceptual
Ans: A
Q.63 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
Ans: B
Q.64 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
Ans: D
Q.65 Which of the following is a comparison operator inSQL?
(A) = (B)LIKE
(C)BETWEEN (D)All of the above
Ans: D
Q.66 A set of possible data values is called
(A) attribute.(B) degree.
(C) tuple.(D) domain.
Ans: D
Q.67 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
Ans:C
Q.68 Which of the following is another name for weak entity?
(A)Child (B)Owner
(C)Dominant (D)All of the above
Ans: A
Q.69 Which of the following database object does not physically exist?
(A)base table (B)index
(C)view (D)none of the above
Ans: C
Q.70 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
Ans: D
Q.71 Which of the following is record based logical model?
(A)Network Model (B)Object oriented model
(C) E-R Model (D)None of these
Ans: A
Q.72 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.
Ans: D
Q.73 A file manipulation command that extracts some of the records from a file is called
(A) SELECT(B) PROJECT
(C)JOIN(D) PRODUCT
Ans: A
Q.74 The physical location of a record is determined bya 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.
Ans: B
Q.75 Using Relational Algebra the query that finds customers, who have a balance of over
1000 is
(A) Π Customer_name
( σ balance >1000
(Deposit))
(B) σ Customer_name
( Π balance >1000
(Deposit))
(C) Π Customer_name
( σ balance >1000
(Borrow))
(D) σ Customer_name
( Π balance >1000
(Borrow))
Ans: A
Q.76 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.
Ans: A
Q.77 In E-R Diagram derived attribute are represented by
(A) Ellipse(B) Dashed ellipse
(C)Rectangle(D) Triangle
Ans B
Q.78 Cross Product is a:
(A) Unary Operator(B) Ternary Operator
(C) Binary Operator(D) Not an operator
Ans: C
Q.79 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)
Ans: B
Q.80 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)
Ans: A
Q.81 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
Ans: D
Q.82 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.
Ans: C
Q.83 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.
Ans: A
Q.84 In E-R Diagram relationship type is represented by
(A) Ellipse(B) Dashed ellipse
(C)Rectangle(D) Diamond
Ans: D
Q.85 Hierarchical model is also called
(A) Tree structure(B) Plex Structure
(C)Normalize Structure (D)Table Structure
Ans: A
Q.86 To delete a particular column in a relation the command used is:
(A)UPDATE (B)DROP
(C)ALTER (D)DELETE
Ans: C
Q.87 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
Ans: A
Q.88 A logical schema
A) is the entire database
B) is a standard way of organizing information into a accessible part
C) describe how data is actually stored on disk
D) none of these
Ans: D
Q.89 A B-tree of order m has maximum of _____________ children
(A) m (B)m+1
(C) m-1 (D)m/2
Ans: A
Q.90 _____________ function divides one numeric expression by another and returns the
remainder.
(A)POWER (B)MOD
(C)ROUND (D)REMAINDER
Ans: B
Q.91 A data manipulation command the combines the records from one or more tables is called
(A)SELECT (B)PROJECT
(C)JOIN (D) PRODUCT
Ans: C
Q.92 In E-R diagram generalization is represented by
(A)Ellipse (B) Dashed ellipse
(C) Rectangle (D) Triangle
Ans: D
Q.93_________ is a virtual table that draws its data from the result of an SQL
SELECT statement.
(A)View (B)Synonym
(C)Sequence (D)Transaction
Ans: A
Q.94 The method of access which uses key transformation is known as
(A)Direct (B) Hash
(C)Random (D)Sequential
Ans: B
Q.95 A table joined with itself is called
(A)Join (B)Self Join
(C)Outer Join (D)Equi Join
Ans: B
Q.96_________ data type can store unstructured data
(A)RAW (B)CHAR
(C)NUMERIC (D) VARCHAR
Ans: A
Q.97 Which two files are used during operation of the DBMS
(A) Query languages and utilities
(B) DML and query language
(C) Data dictionary and transaction log
(D) Data dictionary and query language
Ans: C
Thats For NOw , More in Set 3.
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