NSCT – Data Models MCQs 20 min Score: 0 Attempted: 0/20 Subscribe 1. . A Data Model is: (A) A backup of data (B) A conceptual representation of data, relationships, and constraints in a database (C) A compressed file (D) A hardware deviceShow All Answers 2. . Which of the following is a type of data model? (A) HTTP, FTP, SMTP (B) Linear, Circular, Triangular (C) Hierarchical, Network, Relational, Entity-Relationship, Object-oriented (D) Binary, Decimal, Hexadecimal 3. . In a Hierarchical Data Model: (A) Files are compressed (B) Data is stored in tables only (C) Data is encrypted (D) Data is organized in a tree-like structure with parent-child relationships 4. . In a Network Data Model: (A) Data is only in tables (B) Data is represented using nodes and relationships as a graph (C) Data is compressed (D) Data is encrypted 5. . Relational Data Model stores data in: (A) Files only (B) Hierarchical trees (C) Graphs (D) Tables with rows (tuples) and columns (attributes) 6. . Primary key in relational model ensures: (A) Compression of data (B) Encryption of a table (C) Uniqueness of each record in a table (D) Deletion of old records 7. . Foreign key is used to: (A) Establish a relationship between two tables (B) Encrypt data (C) Compress logs (D) Delete files 8. . Entity-Relationship (ER) model is used for: (A) Deleting data (B) Compressing tables (C) Encrypting tables (D) Designing database schema and representing entities and their relationships 9. . In ER Model, a relationship represents: (A) A backup of data (B) Association between two or more entities (C) Compressed files (D) Encrypted tables 10. . Attributes in a data model describe: (A) Backup files (B) Properties or characteristics of an entity (C) Compressed data (D) Encrypted files 11. . Object-oriented data models combine: (A) Only encrypted data (B) Only tables (C) Only files (D) Data and behavior (methods) in a single structure called an object 12. . Semantic data models focus on: (A) Deleting old files (B) Compressing data (C) Encrypting tables (D) Capturing meaning, rules, and constraints of data for better understanding 13. . Key constraints in data models ensure: (A) Compression of data (B) Uniqueness and identification of data (C) Encryption of files (D) Deletion of old logs 14. . Integrity constraints in data models maintain: (A) Backup files only (B) Accuracy and consistency of data (C) Compressed files (D) CPU performance 15. . A weak entity in ER model: (A) Can exist independently (B) Is encrypted (C) Is compressed (D) Cannot exist without a strong (owner) entity 16. . A strong entity has: (A) A primary key and exists independently (B) Only foreign keys (C) Compressed attributes (D) Encrypted data 17. . Cardinality in ER model represents: (A) Compression ratio (B) Number of tables (C) Number of instances of one entity associated with another entity (D) Encryption level 18. . Aggregation in ER modeling is used to: (A) Compress tables (B) Treat a relationship as a higher-level entity (C) Encrypt files (D) Delete redundant data 19. . Data abstraction in data models provides: (A) Only encrypted files (B) A simplified view of data hiding internal details (C) Compressed tables (D) Automatic deletion 20. . The main purpose of Data Models is to: (A) Increase CPU speed only (B) Compress data (C) Delete old files (D) Provide a clear and structured way to store, manage, and retrieve data efficiently
