None of these answers Câu 162: Physical data flow diagram: a.. Realization is the process of breaking up the data into several tables, so as to minimize the number of times we have to re
Trang 1Trang 2:
Câu 161: Partitioning DFDs:
a The process of analyzing a DFD and deriving a series of manual procedures
b Adding controls to ensure the processes are done property
c The process of analyzing a DFD and deriving a series manual procedures and computer programs
d None of these answers
Câu 162: Physical data flow diagram:
a describing processes in greater detail
b show sequencing processes in the order they must be executed
c show how the system operates or how the new system will be implemented
d all of these answers
Câu 163: Physical DFDs
a show how the system is or will be constructed.
b not concerned about how the system is or will be constructed
c concerned about how the system is or will be constructed
d none of these answers
Câu 164: Process names should be in the form:
a verb
b adjective
c noun
d All of these answers
Câu 165: Select option(s) not true:
a All of these answers
b The database community has developed a series of guidelines for ensuring that databases are normalized
c A database to be in 2NF, it must first fulfill all the criteria of a 1NF database
d Realization is the process of breaking up the data into several tables, so as to minimize the number of times we have to repeat the same data
Câu 166: Select the false statement:
a Requirements engineering is a generic process that does not vary from one software project to another
b It is relatively common for different customers to propose conflicting requirements, each arguing that his her version is the right one
c A stakeholder is anyone who will purchase the completed software system under development.
d None of these answers
Trang 2Câu 167: Select the error(s) in DFDs:
a Connecting data stores and external entities directly to each other
b Incorrectly labeling processes and/or data flow
c Forgetting to include a data flow or pointing an arrowhead in the wrong direction
d All of these answers
Câu 168: Select the false statement (about DFDs):
a Data that travel together should be in the same data flow
b Data should be sent only to the processes that need the data
c A data store within a DFD usually needs to have an input data flow
d label a process with an IF-THEN statement
Câu 169: Select the true statement:
a System Requirements Analysis can be a challenging phase, because all of the major Customers and their interests are brought into the process of determining requirement.(I)
b System Requirements Analysis can’t be a challenging phase, because all of the major Customers and their interests are brought into the process of determining requirements
c The quality of the final product is highly dependent on the effectiveness of the
requirements identification process(II)
d (I) and (II)
Câu 170: Select the true statement:
a Datastore is used to store data
b None of these answers
c The terms datastore and database are interchangeable
d Database is used to store data
Câu 171: Select the true statement:
a Context diagram contains one process node that generalizes the functiob of the entire system in relationship to external entities.
b Context diagram haven’t process node that generalizes the function to the entire system
in relationship to external entities
c Context diagram contains two process node that generalizes the function of the entire system in relationship to external enties
d Context diagram contains many process node that generalizes the function of the entire system in relationship to external entities
Câu 172: Select the right option(s):
a The notion of database normalization was developed reduce data redundancy as much as possible.
b All of these answers
c There are two goals of the normalization process: eliminating redundant data (for example, storing the same data in more than one table) and ensuring data dependencies make sense?(only storing related data in a table)
Trang 3d Normalization is the process of efficiently organizing in a database.
Câu 173: Select the true statement:
a External entities represent people or organizations outside of the system being studied
b External entities shows the initial source and final recipient of data and information
c External entities should be named with a noun, describing that entity
d All of these answers.
Câu 174: Suppose you have a table with fields CAR_ID, CAR_NAME,
STICKER_PRICE, QUOTE_PRICE and DEALER, and that the following functional dependencies exist:
CAR_ID -> CAR_NAME
CAR_ID -> STICKER_PRICE
CAR_ID -> DEALER
DEALER -> QUOTE_PRICE
Which attribute(s) may be key attributes for a 3NF table?
a CAR_ID and DEALER
b CAR_ID
c CAR_NAME, STICKER_PRICE, and DEALER
d None of the others answers
Câu 175: Suppose you have a table with fields A, B, C and D The functional
dependencies in the table are as follows:
Câu 176: Suppose you have a table with fields A, B, C and D The functional
dependencies in the table are as follows:
Trang 4c 3 NF
d BCNF
Câu 177: Suppose you have a table with fields A, B, C and D The functional
dependencies in the table are as follows:
Trang 5Câu 181: The notion of database normalization was developed to
a reduce data intefrity
b increase data integrity
c increase data redundancy
d reduce data redundancy.
Câu 182: The notion of database was developed to reduce data redundancy
a A and B should kept separate with the foreign key in the A relation.
b A and B should kept separate with the foreign key in the A and B
c A and B should kept separate with the foreign key in the B relation
d (I) and (II)
Câu 185: Use a Data Flow Diagram (DFD) to:
a show the relationships among the business process within an organization to external systems
b show the relationships among the business process within an organization to external organizations
c show the relationships among the business process within an organization to customers
Trang 6d All of these answers
Câu 186: What are Data Flow Diagram?
a Data flow diagrams illustrate how data is processed by a system in term of inputs and outputs.
b Data flow diagrams illustrate how data is processed by a system in term of inputs
c Data flow diagrams illustrate how data is processed by a system in term of outputs
d None of these answers
Câu 187: Which of the following is not basic rule of normalization?
a specify a unique field in each table to act as the primary key
b prevent values in a table from being relational.
c minimize redundant data in individual tables
d create a separate entity table for each set of related data
Câu 188: Which of the following is correct about referential integrity?
a (I) and (III) are true
b (II) ensures tables are up to date
c (I) show how tables are related to each other
d (III) prevents data tables from having orphans
Câu 189: Which of the following is not correct with regards to creating tables?
a The 1st Normal form requires that only flat (rectangular) files exist
b A primary key can be made from more than one attribute
c All fields in a table need to depend upson (are identified by) the primary key or the foreign key.
d One rule of designing tables gor a database is to store the smallest meaningful value in
a field
Câu 190: Which of the following is not a function of the requirements phase of building a database system?
a specify data items
b build the data model
c define constraints and rules
Trang 7d requirements
Câu 193: Which of the following is not true with regards to logical data flow diagrams?
a they document the physical structure of an existing system or proposed system.
b Logical Data flow diagrams typically have lower levels (below the level-0 diagram) to show more details about the processes
c they document the processes in an existing or proposed system
d a logical DFD will remain relatively constrant over time relative is physical nature.Câu 194: Which of the following is NOT true:
a Querie are helpful for finding particular records from a database
b SQL is not as flexible as the QBE interface provided by Access
c Queries can perform mathematical calculations on the data in a database
d A query is essentially a mechanism for extracting data from a database
Câu 195: A composite attribute is an attribute that
a is an identifier
b is multi-value
c consists of a group of attributes
d describes a characteristic of the relationship
Câu 196: A data dictionary:
a contains entries specifying the different elements of a data flow
b all of these answers
c a set of rigorous definitions of all DFD data elements and data structures
d is a structured repository of data about data
Câu 197: A data model is
a a logical representation of the data of the database
b a logical representation of the structure of the database
c a physical representation of the structure of the database
d a physical representation of the data of the database
Câu 198: A decidion table does not include:
a views a system as a function that transforms the inputs into desired outputs
b shows the flow of data through a system
c all of these answers
d shows the movement of data through the different transformation or process in the system
Trang 8Câu 200: A file folder containing orders is represented on a data flow diagram as a:
or more items
Based on the information, an E-R diagram is draw below to represent the connectivity, cardinality, and optionality of the relationships (Note: In the ERD below, “order-line” represents each line of item in the order form.)
Suppose you correctly map the above ER Diagram into tables, how many tables need to have foreign keys?
a 6
b 5
c 4
Trang 9Câu 206: An actor is:
a Linked to a single use case
b The system database
c The role of a use case
d None of these about
Câu 207: An association between the instances of one or more entity types that is of interest to the orfanization best defines:
a cardinality
b occurrence
c coupling
d relationship
Câu 208: An attribute (or combination of attributes) that uniquely identifies each instance
of an entity type defines:
a data element occurrence
b gerund
c candidate key
d trigger
Câu 209: An identifier may be
a all of the other answers
b composite
c unique
d a single attribute
Trang 10Câu 210: Assume the first condition has four values; the second condition has two values; the third condition has two values How many rules will there be?
d all of the other answers
Câu 212: Components of a decision tree include:
a decidion points
b states
c rules
d stubs
Câu 213: Data Flow:
a is not have name
b must have a name
c sometime have a name
d none of these answer
Câu 214: Data flow diagrams that concentrate on the movement of data between
processes are referred to as:
Trang 11Câu 217: Everry true entity has a(n)
a It must involve exactly two entity classes
b It must have a maximum cardinality of 1:1
c None of the others answers
d It must have a maximum cardinality of 1:N
Câu 219: If an input from a source appears at level-0, it must:
a be connected to a data flow
b be connected to a data store
c appear on the connected to sink
d appear on the context diagram
Câu 220: If order number serves as the primary key in the ORDER relation and also appears as a nonprimary key attribute in the INVOICE relation, then order number is said
Câu 222: In collaborative requirements gathering, the facilitator
a cannot be a member of the software team
b cannot be a customer
c controls and facilitates the process
d must be an outsider
Trang 12Câu 223: In DATA FLOW DIAGRAMS, symbol in picture are
a PROCESS
b DATAF LOW
c STORE
d SOURCE
Câu 224: If entity B is a mandatory participant, then:
a the minimum cardinality of the relationship optional
b the minimum cardinality of the relationship is one
c the minimum cardinality of the relationship cannot be defined
d the minimum cardinality of the relationship is two
Câu 225: Data Flow:
a is not have name
b must have a name
c sometime have a name
d none of these answers
Câu 226: Recording a customer’s payment is represented on a data flow diagram as a:
Câu 228: Specifying entities is part of which step in the data modeling process?
a determining system requirements
b it is not part of any of the others stpes in the data modeling process
c validating the model
d creating the data model
Câu 229: Stored procedures is a function:
a of the development phase of building a database system
b of the design phase of building a database system
c only used in programming
d of the phase analysis system
Trang 13Câu 230: Studying the current system and proposing alternative replacement systems best defines:
Câu 233: Two entities can be related as One-to-one (1:1):
a An instance of entity ‘A’ can relate to one and only one instance of entity ‘B’ and
an instance of ‘B’ can relate to only one instance of ‘A’ For example, a husband can have only one wife, and a wife can have only one husband.
b
a An instance of entity ‘A’ can relate to one or more instance of ‘B’ while an instance od
‘B’ can relate to one or more instances of ‘A’ For example, an uncle can have many nephews, and a nephew can have many uncles
c None of these answers
d One instance of entity ‘A’ can relate to one or many instances of entity ‘B’, but an instance of ‘B’ can relate to only one instance of ‘A’ For example, a mother can have many children, but a child can have only one mother
Câu 234: The line that marks the inside and outline of system, and that sets off the system from its environment, best defines:
a delineation mark
b boundary
c interface
d scope
Trang 14Câu 235: The lowest level of DFDs is called:
d an updated baseline project plan
Câu 237: The process of converting comlex data structures into simple, stable data
structures is referred to as:
d all of the above
Câu 240: The work products produced during requirement elicitation will vary depending
on the
a size of the budget
b size of the product being buill
c software process being used
Trang 15Câu 242: UML notations that can be used to model the hardware and software elements
of a system are
a Activity diagrams
b Class diagrams
c Deployment diagrams
d All of these answers
Câu 243: Use Case Model provides:
a None of these answers
b blacks-box
c Outside-in view of system functionality
d All of these answers
Câu 244: Use Case Model consists of:
a Actors
b Use Cases
c Relationships
d All of these answers
Câu 245: Using relational notation, an attribute of relation that is the primary key of another relation is indicated by:
a must be changed to a composite key
b must changed to a surrogate key
c must be changed from NOT NULL to NULL
d must be changed from NULL to NOT NULL
Câu 247: When dropping a primary key column from a table, which of the following step are NOT include in the process [the order of the steps listed below is not relevant, only the steps themselves]?
a drop the foreign keys in other tables based on the primary key column
b drop the primary key constraint from the table
c drop the doreign key column from the table
d drop the primary key column from the table