Computer Science - IT MCQs
Topic Notes: Computer Science - IT
<p>MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.</p>
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
121
Which of the following terms is associated with the concept of modality in database relationships?
Answer:
a and b
Modality refers to the minimum number of times an instance of one entity can be associated with an instance of another entity. It indicates whether a relationship is optional (minimum of zero) or mandatory (minimum of one), making both options A and B correct descriptors for modality.
122
Which data mining technique identifies patterns and derives logical rules from existing real-world datasets?
Answer:
Rule discovery
Rule discovery is a data mining process that extracts useful, actionable rules from large datasets. By analyzing real-world case examples, the system identifies correlations and patterns, which are then formulated into rules that can be used for prediction or decision-making.
123
In the context of a relational database, what is the significance of the order of columns?
Answer:
Any
In the relational model, the columns of a relation are considered to be unordered. The identity of a column is determined by its name and data type rather than its position within the table structure. Consequently, the order in which columns are defined or displayed does not impact the integrity or the logical structure of the relation.
124
In the context of database modeling, which of the following entities can be classified as an object?
Answer:
All of these
In database design and object-oriented programming, an object represents an entity that can be uniquely identified. This includes tangible items like a person, abstract entities like an organization, or occurrences like an event, all of which can store attributes and behaviors within a system.
125
Which phase of database design focuses on organizing data structures on secondary storage devices?
Answer:
Physical design
Physical database design is concerned with how data is actually stored on the physical storage media. This phase involves decisions regarding file organization, indexing strategies, and storage allocation to optimize performance and access speed for the database system.
126
Which file organization method is primarily associated with magnetic tape storage media?
Answer:
Sequential
Sequential file organization is the standard method used for magnetic tape media. Because tape is a linear medium, data must be read or written in a specific, consecutive order, making it unsuitable for random or direct access operations.
127
Which of the following terms best describes a computerized system designed for the organized storage and retrieval of records?
Answer:
Database
A database is a structured collection of data held in a computer, specifically designed to facilitate the efficient storage, retrieval, and management of information. While a DBMS is the software used to manage the database, the database itself is the actual repository of the computerized records.
128
What is the requirement for the intersection of a row and a column in a relational database?
Answer:
Single value
A fundamental principle of the relational model is the atomicity of data. Each intersection of a row and a column, known as a cell, must contain exactly one atomic value. This ensures that the database remains in the first normal form (1NF), preventing the storage of repeating groups or multiple values within a single field.
129
What is the technical term for the method used to physically structure and store records within a file on secondary storage media?
Answer:
File organization
File organization refers to the logical and physical arrangement of data records on a storage medium. This technique determines how data is placed, accessed, and managed on disk, directly impacting the performance of read and write operations within a database or file system.
130
What term defines the structure or format of data within a system?
Answer:
Syntax
In computer science and linguistics, syntax refers to the set of rules that defines the combinations of symbols that are considered to be correctly structured. It dictates the format and arrangement of data or code.