Waec 2018 Data processing Question and Answer


DATA-THEORY-Answers

1a)

data model is the process of structuring and organizing data in addition data model can also be defined as a description of the organisation of data in data base

1aii)

i)flat file mode

ii)network model

iii)hierarchical database model

1b)

i)conceptual data model

ii)logical data model

iii)physical data model

1bi)

conceptual model is also known as the data model that can be used to describe the conceptual schema when a database system is implemented. It hides the internal details of physical storage and targets on describing entities, datatype, relationships and constraints.

2a)data is information that has been translated into a form that is more convenient to move or process

2b… In computing, an *icon* is a pictogram or ideogram displayed on a computer screen in order to help the user navigate a computer system or mobile device.

 A web *browser* is a software application for retrieving,presenting and traversing information resources on the World Wide Web.

Question 3
(a) ♡ Ctrl+P
♡ select “pages”
♡ type ” 1, 2, 3, 4, 5″ in the pages field
♡ select the desired printer
♡ click ok

3b
(i) A pop-
up is a graphical user (GUI) display
area. The pop-up window
containing an advertisement is usually
generated by JavaScript that uses cross-site
scripting (XSS), sometimes with a secondary
payload that uses Adobe Flash. They can
also be generated by other vulnerabilities/
security holes in browser security.

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(ii) Pop-up ads or pop-ups are forms of online
advertising on the World Wide Web.

(iii) Open Internet Explorer. Click the
tools button (it is in the top
righthand corner and looks like a
cog), then select internet options.
Go to the Privacy tab, and under
Pop-up Blocker, select the Turn
on Pop -up Blocker check box, and
then tap or click ok.

3c
(i) Microsoft power point
(ii) Projector

3d
♡ Ethernet
♡ Token ring

(4c)
-Corrects fault
-Improves performance
-Adapts to a changing environment
-Predictive cash flow
================
6ai) Monitor
6aii)
i. Monitor
ii. printers
6aiii)
III. CPU
VI. SOCKET AC SOURCE
VII. PRINTER.
6iv)
Ensure you use stabilizer when using the computer so that the power source will not be fluctuating.
6v)
II and III
6vi)
Internet Modem
6bi)
Fig2. is a DVD diskette
Fig3. Is a magnetic tape diskette
6bii)
The magnetic tape media is most suitable
6biii)
A radio player
6biii)
A radio player
6biv)
Virtual sequential access method
6ci)
300×1000/300=1000
6cii)
By compressing the image sizes

9a )- He decides the demand of the product at that time

– He helps to make arrangement for storage facilities

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– He helps to fix the price for the price for the agricultural product

He helps to look at the quality and quantity of agricultural product to be marketed-

He helps to grade the agricultural product

(9 b) – Facilitator helps to decide where there is the demand for the processed food –

He also helps in fixing the good price for the product

– He decides on how to store the product in the case of excess –

He will decide the quality of the product-

He helps in grading of the product

Data processing

(6 a)

(i ) Devices with high Processor is faster in accessing of data

(ii ) When the memory size of the device is high , it quicks data access .

(iii ) When the Content of the device is high, it slows down access of data

(iv ) Virus- free device can access data quicly

(6 b)

(i ) Instant messaging is a type of communications service that enables you to create a kind of private chat room with another individual in order to communicate in real time over the Internet, analagous to a telephone conversation but using text – based , not voice – based , communication .

(ii ) E – commerce (electronic commerce or EC) is the buying and selling of goods and services , or the transmitting of funds or data , over an electronic network , primarily the internet .

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(iii ) Homepage: This is the main page of a website which gives detailed information on its owner and provides links to its other parts . Usually it is the first page seen by every visitor, but some sites ( such as those of newspapers or portals ) display a fresh page everyday, custom – tailored to the individual visitor’ s preferences.

(iv ) ISP : ISP simply means Internet Service Provider. It is a company that provides you with access to the Internet, usually for a fee. The most common ways to connect to an ISP are by using a phone line (dial- up ) or broadband connection ( cable or DSL ) .

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