1. If a column or a set of columns of Table A correspond to a primary key of another Table B, then these set of columns in Table A are known as a _______ key.   primary   reference   foreign   Hint Half-n-half Clue   2. Which structure is the hierarchical model based on?   Tree   Graph   Linked List   None of these   Half-n-half Clue   3. What is the minimum subset of the super key that can be used to uniquely identify an entity in an entity set known as?   Candidate Key   Foreign Key   Unique Key   None of these   Half-n-half Clue   4. In the Network data model, relationship between records is implemented using _______.   keys   pointers   parent-child relationship   None of these   Half-n-half Clue   5. As compared to the Relational & Network Model, searching for data is very easy in Hierarchical Model.   True   False   6. Which of the following are true with respect to Network model? a) Implementing relationship between records is very complex b) It is very useful in representing many-to-many relationships c) Searching for a particular record is very easy   a,b   b,c   a,c   a,b,c   Half-n-half Clue   7. For a database to be considered as full-fledged RDBMS, it has to comply with at least _______ out of the 12 Codd's rules.   1   6   9   10   Half-n-half Clue