WAEC 2019 Data Processing Obj And Essay Answer – May/June Expo

WAEC Data Processing Obj And Essay/Theory Solution Questions and Answer – MAY/JUNE 2019 Expo Runz.

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Data OBJ:
1-10: DCBABDBBDB
11-20: CACCADCCBA
21-30: BBBBAADCAC
31-40: CCDABAADBB

(5ai)
CD-ROM 
(5aii)
CD-ROM technology 
(5aiii)
It switch on the CPU 
aiv) Carefully store in a cool dry place

(5b)
P - It display video and graphical information generated by the computer graphics adaptor, allowing the use to interact with the computer 
Q - It carries out the instructions of a computer program 
R - It is to position a cursor on a computer screen 
S - It is used to input characters and functions into the computer 
T - It converts digital signals generated by the computer into analog signals which can be transmitted over a telephone or cable line and transforms incoming analog signals into their digital equivalent

(5c)
Click on your works pace while still holding down your mouse button drag to draw your shape and release button when done

(4ai)
Entities: are usually recognizable concepts, either concrete or abstract, such as person, places, things, or events which have relevance to the database
(4aii)
attribute: refers to a database component, such a table. It also may refer to a database field. In other words Attributes describe the instances in the row of a database.
(4aiii)
relationships is a common type of database whose data is stored in tables.

(4b)
cardinality refers to the uniqueness of data values contained in a column. In other words High cardinality means that the column contains a large percentage of totally unique values and Low cardinality means that the column contains a lot of “repeats” in its data range.
(4bii)
(i)one-to-one (1:1)
(ii)one-to-many (1:M)
(iii)many-to-many (M:N)

(1a)
Teleconferencing is the use of telecommunication devices to hold discussions between participants in different locations.

(1b)
(i) For cash withdrawals
(ii) For deposits
(iii) For transfer of funds

(1ci)
Modem transmits digital data over communication lines. The conversion of the signals to/from analog to digital is the main purpose of a modem.
(1cii)
(i) Electronic Mails
(ii) Telephone messages

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