DBMS Multiple Choice Questions and Answers

71. Which one of the following statements is false?

1. The data dictionary is normally maintained by the database administrator.
2. Data elements in the database can be modified by changing the data dictionary.
3. The data dictionary contains the name and description of each data element.
4. The data dictionary is a tool used exclusively by the database administrator.

72. A subschema expresses

1. the logical view.
2. the physical view.
3. the external view.
4. all of the above.

73. A data dictionary is a special file that contains:

1. The name of all fields in all files.
2. The width of all fields in all files.
3. The data type of all fields in all files.
4. All of the above.

74. NULL is

1. the same as 0 for integer
2. the same as blank for character
3. the same as 0 for integer and blank for character
4. not a value

75. Hierarchical model is also called

1. Tree structure
2. Plex Structure
3. Normalize Structure
4. Table Structure

76. The RDBMS terminology for a row is

1. tuple.
2. relation.
3. attribute
4. degree

77. In a relational model, relations are termed as

1. Tuples.
2. Attributes
3. Tables.
4. Rows.

78. Architecture of the database can be viewed as

1. two levels.
2. four levels.
3. three levels.
4. one level.

79. What is a relationship called when it is maintained between two entities?

1. Unary
2. Binary
3. Ternary
4. Quaternary

80. Cross Product is a:

1. Unary Operator
2. Ternary Operator
3. Binary Operator
4. Not an operator