Question No: 1 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is NOT a feature of Context DFD?
► one process (which represents the entire system)
► all sources/sinks (external entities)
► data flows linking the process to the sources and sinks (external entities)
► sub-processes (which explain and decomposed the major process into small processes)
Question No: 2 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is true for the relational model?
► Degree of a relation is the number of rows in a relation.
► Null value is a blank or zero value given to an attribute value when its value is inapplicable or its value is unknown.
► Complex key is a key consisting of more than one attribute.
► Constraint is a rule that restricts the values in a database.
Question No: 3 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which one of the following four E-R diagrams is the typical result you obtain when you initially start with an E-R diagram containing just two entities, A and C, in a Many-to-Many relationship, and then introduce an associative entity (B).
► Your browser may not support display of this image.
► Your browser may not support display of this image.
► Your browser may not support display of this image.
► Your browser may not support display of this image.
Question No: 4 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following most certainly implies the need for an entire table to implement?
► A binary relationship
► A ternary relationship
► A recursive relationship
► An identifying relationship
Question No: 5 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following constraints enforces entity integrity?
► PRIMARY KEY
► FOREIGN KEY
► CHECK
► NOT NULL
Question No: 6 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is not true about relational tables?
► Column values are of the same kind.
► Each row is unique.
► Each column must have a unique name.
► The sequence of rows is significant.
Question No: 7 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. In a conceptual model for a university, what type of relationship exists between Grade and Student entities?
► 1:1
► 1:M
► M:M
► Ternary
Question No: 8 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Controlling redundancy in a database management system DOES NOT help to
► avoid duplication
► avoid unnecessary wastage of storage space
► avoid unauthorised access to data
► avoid inconsistency among data
Question No: 9 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is INCORRECT with respect to file systems?
► At the physical level, pointer or hashed address scheme may be employed to provide a certain degree of data independence at the user level.
► A logical record is concerned with efficient storage of information in the secondary storage devices.
► Some physical organisations use pointers to record blocks to locate records on disk.
► The efficiency of a file system depends on how efficiently operations such as retrieve, insert, update, delete may be performed on the information stored in the file.
Question No: 10 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following functions are NOT performed by a database administrator?
► Planning, designing and implementing database systems
► Establishing standards and procedures for database systems
► Communicating with database users
► Allocation of storage locations and data structures
Question No: 11 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Select the correct statement about the ANSI/SPARC architecture.
► The conceptual level is a level of indication between the internal level and the external level.
► The internal level in a database system will definitely be relational.
► Any given database has many conceptual schemas and one physical schema, but it has only one external schemas.
► The external level is not concerned with individual user perceptions, while the conceptual level
is concerned with a community user perception.
Question No: 12 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is a correct way to implement one-to-many relationship while designing tables?
► by splitting the data into two tables with primary key and
foreign key relationships.
► using a junction table with the keys from both the tables
forming the composite primary key of the junction table.
► by splitting each table into three
► as a single table and rarely as two tables with primary
and foreign key relationships.
Question No: 13 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Which of the following is not a benefit of normalization?
► Minimize insertion anomolies
► Minimize deletion anomolies
► Minimize updation anomolies
► Maximize redundancy
Question No: 14 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. Consider the following relation R and its sample data. (Consider that these are the only tuples for the given relation)
Your browser may not support display of this image.
Which of the following statements is NOT correct?
► The functional dependency (EmpNo, DeptNo) -> ProjNo holds over R.
► The functional dependency EmpNo -> DeptNo holds over R.
► The functional dependency ProjNo -> DeptNo holds over R.
► The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R.
Question No: 15 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. The Entity Relation Model models
► Entities, Relationships and Processes
► Entities and Relationships
► Relationships
► Entities
Question No: 16 ( Marks: 1 ) - Please choose one
Your browser may not support display of this image. As part of database naming conventions, attribute names should use suffixes such as ID, NUMBER or CODE for the _______.
► primary key
► foreign key
► index
► determinant
Question No: 17 ( Marks: 2 )
Your browser may not support display of this image. For which purpose do we use relational data model?
Question No: 18 ( Marks: 2 )
Your browser may not support display of this image. What major problem can occur if we do not normalize a relation into the first normal form?
Question No: 19 ( Marks: 2 )
Your browser may not support display of this image. In which situation do a recursive relationship exist?
Question No: 20 ( Marks: 3 )
Your browser may not support display of this image. What is DML (Data Manipulation Language)?
Question No: 21 ( Marks: 3 )
Your browser may not support display of this image. What are the three important objectives for using data types while specifying attributes?
Question No: 22 ( Marks: 5 )
Your browser may not support display of this image. Briefly explain super key in relation with primary key.
Question No: 23 ( Marks: 5 )
Your browser may not support display of this image. When is a functional dependency F said to be minimal?