Question 1

1(a). What is a Report in a database system?

Accepted Answer

A report is a database object that is used to present information from a database, for the purpose of displaying or distributing a summary of data.

Question 2

1(b). List four ways in which Reports can be viewed in a database management system.

Accepted Answer

Design view; Report view; Layout view; Print preview.

Question 3

1(c). Outline the steps to print a Report in MS Access.

Accepted Answer

Right-click on the report name on the navigation pane → click Print Preview → click Print/CTRL+P → click OK. (Alternative: select the report on the navigation pane → click Print Preview → click Print/CTRL+P → click OK.)

Question 4

2. Perform the following conversions in the stated number bases: (a) AB1₁₆ to Octal system; (b) 1110111.101₂ to Denary (decimal) system; (c) 507₈ to Binary system.

Accepted Answer

(a) AB1₁₆ = A×16²+B×16¹+1×16⁰ = 10×256+11×16+1 = 2560+176+1 = 2737₁₀. Converting 2737 to octal by repeated division by 8: 2737÷8=342 r1; 342÷8=42 r6; 42÷8=5 r2; 5÷8=0 r5. Reading remainders bottom-up: 5261₈.
(b) 1110111.101₂ = (1×2⁶+1×2⁵+1×2⁴+0×2³+1×2²+1×2¹+1×2⁰) + (1×2⁻¹+0×2⁻²+1×2⁻³) = (64+32+16+0+4+2+1) + (0.5+0+0.125) = 119 + 0.625 = 119.625₁₀.
(c) 507₈ converts first to decimal: 5×64+0×8+7×1 = 320+0+7 = 327₁₀, then to binary: 327 = 101000111₂.

Question 5

3(a). (i) What is a Universal Serial Bus (USB)? (ii) State two benefits of a USB connection between a computer and another device.

Accepted Answer

(i) USB (Universal Serial Bus) is the most popular hardware interface/connection standard used to connect a computer to devices such as digital cameras, printers, scanners, and external hard drives, among others. It is also used for charging portable devices and provides both data transmission and low-voltage power over a single cable.
(ii) Any two: it can be used to charge devices; it supports fast data transfer; it provides low-voltage (5V) power through a single cable; no external power source is needed; it has low power consumption.

Question 6

3(b). In Table 1, three storage devices are described. Use it to answer 3(b)(i) and 3(b)(ii): (i) in column 1, identify the storage device by ticking in any of columns 3, 4 or 5; (ii) state the category of each storage device.

Accepted Answer

Table 1 describes three storage devices by their characteristics — e.g. row 3 describes a 'Non-volatile memory chip which [its] contents cannot be altered; it is often used to store the start-up routines in a computer (e.g. the BIOS)' — this identifies the device as ROM (Read-Only Memory), categorised as primary storage. Students identify each row's device name and mark (tick) its correct storage category (primary/secondary/offline) in the corresponding column.

Question 7

4(a)(i). Define computer graphics.

Accepted Answer

Computer graphics is the creation, manipulation, and storage of pictures/geometric objects (modelling) and their images (rendering) with the help of a computer — the art of drawing pictures, lines, charts and other graphical images using specialized computer programs/applications.

Question 8

4(a)(ii). State two applications of computer graphics in advertising.

Accepted Answer

Any two of: animation/motion pictures; business cards; branding; billboards; flyer/flex creation; posters; modelling/design; digital marketing; pitching for projects; print media adverts; TV commercials; banners; logo design; letter-heads; presentations; postcards; infographics; brochures; vehicle wraps; signage and trade show displays; email marketing templates.

Question 9

4(b). Give one use of each of the following computer graphics application tools: (i) Interactive Fill Tool; (ii) Texture Fill Tool; (iii) Envelope Tool; (iv) Extrude Tool.

Accepted Answer

(i) Interactive Fill Tool: used to create a fill dynamically by using markers in the drawing window and a property bar, to change the angle, midpoint, and colour of an object/image.
(ii) Texture Fill Tool: used to apply preset texture fills to objects to create the illusion of a variety of textures, such as water, clouds, and stone.
(iii) Envelope Tool: lets the user reshape an object by dragging the nodes or points around the envelope.
(iv) Extrude Tool: lets the user apply the illusion of depth to objects — it projects surfaces from an object to give it a 3-dimensional shape/appearance.

Question 10

4(c). Name one Fill Tool in computer graphics application which is needed to: (i) create a background that is faded from light blue to white; (ii) fill an object with two colours that blend from one to another.

Accepted Answer

(i) Any one: Interactive Fill Tool; Fountain Fill Tool; Transparency Tool.
(ii) Any one: Interactive Fill Tool; Fountain Fill Tool; Two-colour Pattern Fill Tool.

Question 11

5. Write a BASIC program to grade any score entered from the keyboard as either 'Poor' for a score that is below 50% or 'Satisfactory' for a score that is equal to or above 50%. The program execution should stop as soon as a score that is less than zero is entered.

Accepted Answer

10 REM program to grade entered scores
20 CLS
30 Score = 0
40 DO UNTIL Score < 0
50 INPUT "Enter a score:"; Score
60 IF Score < 50 THEN
70   PRINT "Poor"
80 ELSE
90   PRINT "Satisfactory"
100 END IF
110 LOOP
120 END

(Alternative, using SELECT CASE):
DIM Score AS INTEGER
DO UNTIL Score < 0
  INPUT "Enter a score:"; Score
  SELECT CASE Score
    CASE 50 TO 100
      PRINT "Satisfactory"
    CASE 0 TO 49
      PRINT "Poor"
  END SELECT
LOOP
END

WAEC Computer Studies 2021 Theory Past Questions

Computer Studies 2021 Theory — Question 1

Computer Studies 2021 Theory — Question 2

Computer Studies 2021 Theory — Question 3

Computer Studies 2021 Theory — Question 4

Computer Studies 2021 Theory — Question 5

Computer Studies 2021 Theory — Question 6

Computer Studies 2021 Theory — Question 7

Computer Studies 2021 Theory — Question 8

Computer Studies 2021 Theory — Question 9

Computer Studies 2021 Theory — Question 10

Computer Studies 2021 Theory — Question 11

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