[vu-students] cs403-Quiz-2

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From: *`·.¸¸.·*Madeeha*··.¸¸.·`* <madeeha.ckl@gmail.com>
Date: Mon, May 9, 2011 at 10:12 AM
Subject: .::VU Chakwalian::. cs403-Quiz-2
To: vu-chakwalian <vu-chakwalian@googlegroups.com>

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 1 of 10 ( Start time: 10:00:41 AM ) Total Marks: 1 Normalization of database is essential to (i) avoid accidental deletion of required data when some data is deleted (ii) eliminate inconsistencies when a data item is modified in the database (iii) allows storage of data in a computer's disk (iv) use a database management system Select correct option: i and iii i and ii ii and iii ii and iv

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 2 of 10 ( Start time: 10:01:09 AM ) Total Marks: 1 Normalization is a process of restructuring a relation to Select correct option: minimize duplication of data in a database maximize duplication of data to ensure reliability make it of uniform size allow addition of data

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 3 of 10 ( Start time: 10:01:29 AM ) Total Marks: 1 Attributes are (i) properties of relationship (ii) attributed to entities (iii) properties of members of an entity set Select correct option: i i and ii i and iii iii

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 4 of 10 ( Start time: 10:01:53 AM ) Total Marks: 1 The process of normalization Select correct option: is automatic using a computer program requires one to understand dependency between attributes is manual and requires semantic information is finding the key of a relation

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 5 of 10 ( Start time: 10:02:14 AM ) Total Marks: 1 A second Normal Form (2 NF) relation should Select correct option: be in 1 NF not have a composite key not have attributes dependent on key attribute not have attributes dependent on one another

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 6 of 10 ( Start time: 10:02:23 AM ) Total Marks: 1 "Select" and "project" are the examples of Select correct option: Unary operations Binary operations Ternary operations All of above

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 7 of 10 ( Start time: 10:02:46 AM ) Total Marks: 1 An attribute y may be functionally dependent on (i) a composite attribute x,y (ii) a single attribute x (iii) no attribute Select correct option: i and ii i and iii ii and iii iii

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 8 of 10 ( Start time: 10:03:23 AM ) Total Marks: 1 DML perform functions such as Select correct option: Insertion Deletion Creation of database All of above

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 9 of 10 ( Start time: 10:03:33 AM ) Total Marks: 1 A relation which is in a higher normal form Select correct option: implies that it also qualifies to be in lower normal form does not necessarily satisfy the conditions of lower normal form is included in the lower normal form is independent of lower normal forms

Quiz Start Time: 10:00 AM Time Left 89 sec(s) Question # 10 of 10 ( Start time: 10:03:58 AM ) Total Marks: 1 In "One to Many" cardinality one instance of a relation is mapped with Select correct option: many instances of second entity type One instance of second entity type Primary key of 2 relations none of above

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