12th Class Computer Science Chapter 3 Short Questions with Answers Online Preparation

Question # 1

Ans 1: The major objective of database design process is to map the conceptual data model to an implementation model that is acceptable to all users throughout the organizations . In today's is complete and up-to-date and they expect to be able to access this information quickly and easily .

Question # 2

Ans 1: Data analysis is an important analysis aspect while designing a database.It involves the following activities:
1. Data Flow Diagram
2. Decision Table
3. Decision Trees

Question # 3

Ans 1: Attributes defines the objects,describe their characteristics and in some cases,make references to other object i.e attributes for a TEACHER could be: Teacher,Name,Gender,Last degree,Appointment Data,Pay Scale,Nationality,Telephone No.etc.

Question # 4

Ans 1: A systematic examination and evaluation of data or information by breaking it into its components parts to uncover their interrelationships is called analysis,The following are the types of analysis.
1. Data Analysis
2. Requirements Analysis
3. Project Analysis

Question # 5

Question # 6

Ans 1: The purpose of feasibility study is called preliminary investigation of the required database,It involves the area of identification and selection i.e which area or aspect is to be selected to start with.After the project is selected,it is allocated a specific fund and a proper planning is chalked out of its practical implementation.

Question # 7

Question # 8

Ans 1: A data is entity or object is anything that is participating in the system.It is always properly identifiable i.e a TEACHER,a STUDENT,an AEROPLANE.

Question # 9

Ans 1: Relation:A two dimensional array or table of data containing descriptive information about an entity.The entity must have a unique identifier,which is composed of a combination of one or more attributes and each attributes must have one and only one value.
Ans 2: Relationship:The relationship indicated how the entities/Objects are connected or related to each other,
- All the relationship defines the relevant connections between both objects.
- All the relationship are bi-directional.

Question # 10

Ans 1: The relationship indicates how the entities.objects are connected or related each other.
- All the relationship defines the relevant connection between both objects.
- All the relationship are bi-directional.