2021 WASSCE COMPUTER STUDIES QUESTIONS AND ANSWERS

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WAEC 2021 COMPUTER STUDIES ANSWERS

(1a)

Reports in a database are the reports created from a culmination of queried data visualized for the purposes of analysis, data discovery, and decision-making. In other words database reports can be created through traditional BI platforms and embedded BI platforms through front-end calls to a backend database.

(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)

First, convert AB1 into decimal, by using above steps:

= AB1

= A  162B  1611  160

= 273710

Now, we have to 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

Then just write down the remainders in the reverse order to get the answer, The hexadecimal number AB1 converted to octal is therefore is equal to 5261

(2b)

Decimal equivalent of "1" = 1  3^1 = 3

Decimal equivalent of "1" = 1  3^2 = 9

Decimal equivalent of "0" = 0  3^3 = 0

Decimal equivalent of "1" = 1  3^4 = 81

Decimal equivalent of "1" = 1  3^5 = 243

Decimal equivalent of "110111" = 243810931

110111 = 337

Now we will convert the fractional part 0.101 to decimal form (Don't forget that we start from tenths palce to so on..):

Decimal equivalent of "1" = 1  3^-1 = 0.33333333333333

Decimal equivalent of "0" = 0  3^-2 = 0

Decimal equivalent of "1" = 1  3^-3 = 0.037037037037037

Decimal equivalent of "0.101" = 0.3333333333333

300.037037037037037

0.101 = 0.37037037037037

Here is the final answer, The ternary number 110111.101 converted to decimal is therefore equal to:

= 110111.1013

= 33710 + 0.3703703703703710

= 337.3703703703703710

(2c)

First, convert 5078 into decimal, by using above steps:

= 5078

= 5  820  817  80

= 32710

Now, we have to 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

101000111

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(4ai)

Computer graphics is a sub-field of computer science which studies methods for digitally synthesizing and manipulating visual content.

(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 to 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 own texture fill. You can use colors from any color model or palette.

(4iii)

Evenlope Tool: Envelope Tool is used to create and manipulate "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 shapes in the scene. It allows you to create an extruded 3D shape from the selected 2D shape by defining various parameters.