All 40 questions from the West African Examinations Council (WAEC) Data Processing 2023 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
Advertisement
Artificial intelligence is a feature of A. second generation computers.
Fifth generation computers (2010 till present) use Artificial Intelligence (AI) as underlying technology and hardware.
The Difference Engine and the Analytical Engine were invented by A. Ada Lovelace and Charles Babbage.
Charles Babbage invented the Difference Engine (an automatic mechanical calculator) and the Analytical Engine (a general purpose programmable mechanical digital computer).
Which of the following data elements ranks highest in size?
In order of size: Bit < Byte < Field < Record < File < Database. Record is the largest among the given options.
The aim of administering questionnaire is to collect A. data.
Questionnaires are administered as a data collection tool.
Which of the following computer types represents data as variable and continuous values?
An analogue computer represents data in variable, continuous physical quantities (as opposed to digital computers which use discrete values).
A digital platform for the delivery of public sector information and seminar to citizens is called A. e-library.
e-government (electronic government) offers new opportunities for direct access to the government by the citizen (G2C) or other government agencies (G2G) etc.
One application of ICT in medicine is A. a global positioning system.
Computerized axial tomography (CAT) is a very detailed diagnostic procedure that uses X-ray equipment to provide three-dimensional pictures or detailed images of internal organs and tissues.
A pointing device that controls cursor movement on the screen is a A. keyboard.
A trackball is a pointing device used to control cursor movement on the screen.
The process of drawing inference from a piece of information is called A. analysis.
Analysis is the process of drawing inference from a piece of information.
The information processing stage that produces detailed evaluation of data is A. analysis.
Note: per the official answer key, this corresponds to option B — Collection, in this exam's marking scheme.
The volume of data that can be sent from one point to another in a given time period is called A. baud.
Bandwidth determines the amount (volume) of information (data) that can be transmitted across a given path in a given unit of time, while broadband refers to high speed internet access that brings internet signal to and from a device through a telephone cable.
The equipment shown in Figure I is used for A. audio transmission.
The tower/mast illustrated in Figure I represents a radio transmission tower/antenna.
A student in the school hostel was able to upload personal details on the school porter via the school's WiFi. The ISP and the hostel are both domiciled in the school premises. What type of network is illustrated above?
Local Area Network (LAN) is a type of network that is confined to a small geographic area, such as a school, office building or home.
The physical infrastructure through which internet traffic is exchanged between the ISPs in the illustrated scenario and other ISPs is called A. internet exchange point.
An internet exchange point (IXP) is a physical location where multiple internet service providers (ISPs) connect their networks together to exchange internet traffic; it acts as a central hub for routing internet.
New message received are saved in the part labelled
New messages received are saved in the Inbox, labelled II in the given e-mail interface diagram.
To send an e-mail, the user must click on the part labelled
To compose and send a new e-mail, the user must click on 'New' (I) in the given e-mail interface.
The allocation and de-allocation of computing resources in a computer is the function of A. application software.
The memory unit in a computer is responsible for allocating and deallocating computing resources.
Which of the following alignment styles can be achieved when the command Ctrl + J is executed in MS Word?
Ctrl+J applies Justify alignment in MS Word, aligning text evenly along both the left and right margins, matching option C in the diagrams shown.
The ruler feature in MS Word that is used to indent the second and subsequent lines of a paragraph is A. hanging indent.
A hanging indent is a formatting feature in MS Word that allows you to indent the second and subsequent lines of a paragraph.
What formula will correctly display the total number of individuals involved in the computation as shown in Figure 3?
What formula will calculate the total number of individuals who earn less than #500,000 from the table shown in Figure 3?
COUNTIF is a function in spreadsheet packages that counts the number of cells that satisfy a particular condition; the correct syntax would be =COUNTIF(E2:E5,"<500,000") to count individuals earning less than #500,000 (option D reflects the correct COUNTIF usage pattern among the choices).
How many entities are listed in Figure 4?
Figure 4 (the entity relationship diagram) lists 5 entities.
What kind of relationship exists between users and products as shown in Figure 4?
Many-to-many, as all the entities are interlinked with more than one line, as shown in the entity relationship diagram.
Figure 5 is an MS PowerPoint application interface. The part used to apply a motion effect to different objects of a slide is labelled
In MS PowerPoint, the Animations tab/part (labelled II) is used to apply a motion effect to different objects of a slide.
Macromedia Dreamweaver application is used for A. graphic designs.
Macromedia Dreamweaver is used for web design; it can be used to design websites and webpages visually or by using codes.
The following features are found in the toolbox of CorelDraw application except A. ellipse tool.
The marquee tool is not a tool that is found in the CorelDRAW toolbox. The marquee tool is a tool that is used in some other graphics applications such as Adobe Photoshop to select an area of an image by dragging a rectangular or elliptical outline around it.
When performing computer recovery operations after System crash, the startup disk is used to A. backup deleted users file.
The startup disk is used to restore the system to an earlier time.
A computer system under use was found to be unusually slow, freezes often and very dusty. What is needed to correct this problem?
Perform maintenance procedure. This is required as the computer has obviously been poorly taken care of.
Computer ethical practices include the following except A. exposure of vulnerability in websites.
Use of other people's computer without due permission is not an ethical practice — it is unethical, unlike the other listed options.
Which of the following devices is needed by a technician for protection against electrostatic discharge?
A wrist strap is used to write/discharge static electricity, protecting sensitive computer components from electrostatic discharge.
People who use Cathode Ray Tube monitor without antiglare screen are susceptible to A. back ache.
People who use CRT monitors without antiglare screens are susceptible to blurred vision from the screen's glare/radiation.
Database Administrator is a professional who A. tests and detects vulnerabilities on hardware devices and software.
A Database Administrator (DBA) is responsible for designing, implementing and maintaining a database.
The following precautionary measures are taken against virus infection except A. regular updating of antivirus.
Scanning of email attachments should be done before downloading, not after. Downloading an attachment before scanning it exposes the system to virus infection.
Computer malware is detected by A. adware.
Antivirus software is used to detect computer malware.
Columns 2 and 3 in Table 1 cannot be used as primary key because both fields contain A. the same datatype.
A primary key is a field in a database that contains unique values for every different record; there can be no duplicates. Since columns 2 (House) and 3 (Age) in Table 1 contain duplicate values, they cannot be used as primary key.
The attributes in Table 1 are A. 18/001, 18/002, 18/003.
Attributes in a database describe the instances in each column of a database — here that is Reg. No, House, Age.
Random access file organization, when compared to other file organization methods, is relatively fast because A. entries are queued up before writing.
Random access file organization, when compared to other file organization methods, is relatively fast because data can be written/accessed directly to any location, unlike sequential methods.
A type of file organization that stores data in the order of their arrival is called A. sequential file organization.
Sequential file organization is a type of file organization that stores data in the order of their arrival.
The following terms describe the importance of data security except A. availability.
Normalization is a database design technique, not a term that describes the importance of data security (unlike availability, consistency and integrity, which are key data security concerns).
Advantages of parallel database include the following except A. greater flexibility.
A parallel database is designed to take advantage of and improve performance by running multiple processors, which work in parallel on a single database. As it requires high cost to set up, it is not highly available — thus, high availability is NOT an advantage.
Advertisement
…and/or go further with premium services and No Ads.