# WAEC 2021 COMPUTER STUDIES ANSWERS

## 2021 WAEC COMPUTER STUDIES ANSWERS – Examland.com.ng

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### COMPUTER STUDIES OBJ

01-10: BCACCBCBDC

21-30: DCDBCCAABD

41-50: ABABACACDC

Completed.
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### COMPUTER STUDIES ESSAY

INSTRUCTIONS: ANSWER THREE (3) QUESTIONS ONLY
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(1a)
Reports in a database are the reports created from a culmination of queried data visualized for analysis, data discovery, and decision-making.

(1b)
(i) Tables
(ii) chart
(iii) JSON document
(iv) Graph

(1c)
(i) Select the report that you want to print.
(ii) Click File
(iii) Then click Print.
(iv) On the Print area of the File options, click the Print option to open the Print dialog box.
(v) Change the page format setup or other print options or printer selection as needed.
(vi) And then click OK to print your report.
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(2a)
Convert AB1base16 into decimal
= AB1base16
= A × 162B × 1611 × 160
= 273710

Convert 273710 to octal
2737 / 8 = 342 with remainder 1
342 / 8 = 42 with remainder 6
42 / 8 = 5 with remainder 2
5 / 8 = 0 with remainder 5
= 5261base8

(2b)
1110111.101base 2 to denary system
= (1×2^6) + (1×2^5) + (1×2^4) + (0x2^3) + (1×2^2) + (1×2^1) + (1×2^0) + (1×2^-1) + (0x2^-2) + (1×2^-3)
= (1×64) + (1×32) + (1×16) + (0x8) + (1×4) + (1×2) + (1×1) + (1x½) + (0x¼) + (1x⅛)
= 64 + 32 + 16 + 0 + 4 + 2 + 1 + ½ + 0 + ⅛
= 119/1 + 1/2 + 1/8
= 952 + 4 + 1/8
= 957/8
= 119.6base10

(2c)
Convert 5078 into decimal
= 5078
= 5 × 820 × 817 × 80
= 32710

Convert 32710 to binary
327 / 2 = 163 with remainder 1
163 / 2 = 81 with remainder 1
81 / 2 = 40 with remainder 1
40 / 2 = 20 with remainder 0
20 / 2 = 10 with remainder 0
10 / 2 = 5 with remainder 0
5 / 2 = 2 with remainder 1
2 / 2 = 1 with remainder 0
1 / 2 = 0 with remainder 1
= 101000111base 2
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(3a)
Universal Serial Bus (USB) is a common interface that enables the communication between devices and a host controller such as a personal computer (PC) or smartphone.

(3aii)
(i)It is very easy to install a USB device and requires only OS (Operating System).
(ii)USB supports different data rates from 1.5 Mbps to 5 Gbps with different distances.

(3b)
-TABULATE-
(i)
-Name Of Storage Device-
(a) Floppy Disk

-Category Of Storage Device-
(a) Secondary

(iii)
-Name Of Storage Device-
(a) Dvd

-Category Of Storage Device-
(a) Offline

(iii)
-Name Of Storage Device-

-Category Of Storage Device-
(a) Primary
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(4ai)
Computer graphics is a sub-field of computer science that studies methods for digitally synthesizing and manipulating visual content. In other words, although the term often refers to the study of three-dimensional computer graphics, it also encompasses two-dimensional graphics and image processing.

(4aii)
(i)Computer Art
(ii) Computer-aided drawing.

(4bii)
Interactive Fill tool: Interactive Fill tool to color the fish modified in other videos. To apply an interactive fill, click the Interactive Fill tool, click an object, and then drag. To change the fill colors, drag colors from the color palette to the square handles or the fill path.

(4biii)
Texture Fill tool: A texture fill tool is a randomly generated fill that you can use to give your objects a natural appearance. You can use existing texture fills, such as water, minerals, and clouds, or you can edit a texture to create your texture fill. You can use colors from any color model or palette.

(4iii)
Envelope Tool: The envelope Tool is used to creating and manipulating “control points” at various points in the track. The control points then determine its volume changes over time.

(4iv)
Extrude Tool: The Extrude tool is used in conjunction with an existing 2D shape or shape in the scene. It allows you to create an extruded 3D shape from the selected 2D shape by defining various parameters.

(4ci)
Mesh fill tool

(4cii)
Interactive blend tool
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Completed.