2022 NECO Data Processing (OBJ & Essay) Answers [11th August]
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NECO JUNE/JULY 2022 FREE DATA PROCESSING OBJ & ESSAY (DATA) QUESTION AND ANSWER ROOM 
 
Thursday 11th August 2022
Data Processing (Objective & Essay)
10:00am – 1:00pm
 

A. 2022 NECO DATA PROCESSING (OBJECTIVES) ANSWERS:

1-10: CDCDBCBAEA
11-20: AABEDDDEEB
21-30: CAECABDBCA
31-40: EBCBCBCDCB
41-50: BABDBDDDBC
51-60: BBDAABBCCD
 

B. 2022 NECO DATA PROCESSING (THEORY) ANSWERS: 

(2ai)
(Pick Any Two)

(i) public switched Telephone Network (PSTN)
(ii) Global system for mobile communication
(iii) satellite Telephone system
(iv) Fixed wireless Telephone system

EXPLANATION:
(Pick Any one)

(i)satellite Telephone system: Satellite Telephone System: Satellite Telephone systems provide fixed, mobile and portable communications to the user. Satellite telephone systems are available for handheld, portable, fixed, mobile or marine use. The handheld devices are like a normal cell phone, but with a larger antenna. The portable systems are usually a suit-case style system that offers greater capabilities than the handheld system

(ii)Fixed Wireless Telephone System: Fixed wireless phones are designed to provide service in rural or underdeveloped areas, where portable, battery-powered handsets often perform poorly. Fixed wireless phones plug into standard AC outlets and resemble a conventional landline phone (fixed) but communicate over existing cellular networks (wireless). They are primarily designed for developing countries, but the phones are also ideal in offices, vacation resorts, and other cost-sensitive or remote locations.

(2aii)
(Pick Any Four)

(i)twisted-pair cable (ii)coaxial cable
(iii) fiber optic cable
(iv) Stripline
(v)Microstripline

(2bi)
Word processing is the phrase used to describe using computer to create, edit  and print documents. It is also the creation ,input , editing and production of a document with a computerized device. A word processing package enables you to type in and manipulate text.

(2bii)
(Pick Any Two)

(i) Microsoft word
(ii) word perfect
(iii) word star
(iv) word craft

 (2biii)

(i) click the Microsoft office button and click Save or save As.
(ii) Press CTRL + s on the keyboard.

2022 NECO Data Processing (OBJ & Essay) Answers [11th August]

2022 NECO Data Processing (OBJ & Essay) Answers [11th August]

(4ai)
Graphic packages are those programs that allow artiste and computer users to use computers to create, edit, display and print graphic images. A graphics package is an application that can be used to create and manipulate images on a computer. Examples include Paint, Adobe Photoshop, Corel draw, CAD (computer aided design).

(4aii)
(Pick Any Two)

(i)Painting packages
(ii) Drawing packages
(iii) photo editing
(iv) Computer Aided Design (CAD)


(4aiii)
(Pick any Two)

(i) Drawing straight lines and 'freehand' lines
(ii)Drawing regular pre defined shapes like squares, rectangles and circles using a special tool
(iii) Entering text and changing the style and size of font.
(iv)changing the size of an object or scaling

(4bi)
First normal form (1NF) sets the fundamental rules for database normalization and relates to a single table within a relational database system. In First Normal form ,some rules such as eliminate repeating information and create separate tables for related data are observed. Taking a students and courses database to the first normal form would means that you have to create two tables; one for students and one for courses.

(4bii)
Second normal form (2NF) is the second step in normalizing a database. 2NF builds on the first normal form (1NF).2NF attempts to reduce the amount of redundant data in a table by extracting it, placing it in new tables and creating relationships between those tables. In a 2NF compliant database structure , this redundant information like ZIP,City and state can be extracted and stored in a separate table.

(4biiii)
Third normal form (3NF) is a database schema design approach for relational databases which uses normalizing principles to reduce the duplication of data, avoid data anomalies, ensure referential integrity, and simplify data management.The third normal form rule is that the non-key attributes should be independent. This normal form is violated when there exists a dependency among non-key attributes in the form of a transitive dependency

(5ai)
(Pick Any Four)

(i)Single user operating system
(ii) multi tasking operating system
(iii) Multi user operating system
(iv) Distributed operating system
(v) Batch processing operating system
(vi) Real time operating system


(5aii)
(Pick Any Two)
(i)First Come First Served(FCFS): first-come-first-served (FCFS) processes jobs in the order in which they are received. This is not a very fair policy, because a long-running job could be running, and other processes have to wait for it to finish. To the end-user, this could look like a system freeze or lock-up.

(ii)Shortest job next (SJN) scheduling: it is also also known as shortest job first (SJF) or shortest process next (SPN), is a scheduling strategy that selects for execution the waiting process with the smallest execution time. SJN is a non-preemptive algorithm. Shortest remaining time is a preemptive variant of SJN.

(iii)Priority scheduling: Priority scheduling  is a non-preemptive algorithm and one of the most common scheduling algorithms in batch systems. Priority can be decided based on memory requirements, time requirements or any other resource requirement.

(5bi)
Data modeling is the process of creating a simplified diagram of a software system and the data elements it contains, using text and symbols to represent the data and how it flows. Data models provide a blueprint for designing a new database or reengineering a legacy application.


(5bii)
(i) conceptual data model
(ii) enterprise data model
(iii)logical data model
(iv) physical data model

(6ai)
(Pick Any Four)

(i) Fax machine
(ii) Telephone/mobile phone
(iii) Television
(iv) Radio
(v) Internet
(vi) Telegraph

(6aii)
(Pick Any Two)
(i) Telephone/mobile phone: Telephones and mobiles are most commonly used means of communication. They are not only very fast but also link far distant location within no time. Telephone are static whereas mobile phones can be carried anywhere. They help anyone to talk to others anytime and am from  anywhere

(ii) Telegraph: A Telegraph is a Communication system in which information is transmitted over a wire through a series of electrical current pulses ,usually in the form of Morse code. The basic components include a source of direct current, a length of wire or cable , and a current indicating device such as a relay, buzzer it light bulb.

(iii) Internet: In modern age, internet is very cheap and reliable means of not only for communication but also useful for employment and education. Internet has brought the whole world to a very small workplace. We can surf for any information on internet. Search engines help to search that information within no time. E mail can also be used to send small or bulk of information to any part of the world


(6bi)
ARIS : Algorithms for Recovery and Isolation Exploiting Semantics

(6bii)
(Pick Any Two)

(i) Repeating history during Redo
(ii) Logging changes during undo
(iii) Write ahead logging

(6biii)
(i) REDO phrase: The redo phase restore the database to the exact state at the crash, including all the changes of uncommitted transaction that were running at the point in time.

(ii) UNDO phrase : The UNDO Phase undoes all uncommitted changes ,leaving the database in a consistent state. However, the changes of uncommitted transaction have to be undo to restore the database to a consistent state.

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