1. Which company has developed the hierarchical model?   IBM   Sun Microsystems   Microsoft   Oracle   Hint Half-n-half Clue   2. 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   3. What is the set of attributes that collectively identify an entity in an entity set known as?   Super Key   Foreign Key   Unique Key   None of these   Half-n-half Clue   4. In the Relational Model, the number of rows in a table is termed as _______.   cardinality   degree   domain   None of these   Half-n-half Clue   5. The candidate keys that are not selected as the Primary key are known as _______.   super key   alternate keys   secondary key   foreign key   Half-n-half Clue   6. The domain in the relational model is said to be atomic if the elements of the domain consist of _______ units.   indivisible   divisible   distinct   redundant   Half-n-half Clue   7. As compared to the Relational & Network Model, searching for data is very easy in Hierarchical Model.   True   False