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Waec computer studies question and answer 2021

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waec expo 2021

Waec computer studies question and answer 2021

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COMPUTER STUDIES
01-10: BCACCBCBDC
11-20: BABAAACADD
21-30: DCDBCCAABD
31-40: AADBDBBBBA
41-50: ABABACACDC

COMPLETED

===================================

(3a)

Universal Serial Bus (USB) is a common interface that enables communication between devices and a host controller such as a personal computer (PC) or smartphone.

 

(3aii)

(i)It is very easy to install 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-

(a) Secondary

 

(ii)

-NAME OF STORAGE DEVICE-

(a) Dvd

 

-CATEGORY OF STORAGE-

(a) Offline

 

(iii)

-NAME OF STORAGE DEVICE-

(a) Read only memory (ROM)

 

-CATEGORY OF STORAGE-

(a) Primary

 

*COMPUTER STUDIES*

 

(4ai)

Computer graphics is the use of computers to create and manipulate pictures on a display device.

 

(4aii)

(i) Signage

(ii) Branding

 

(4bii)

Interactive Fill tool: This allows you to add the same fills to objects as the normal fill tool, but in an interactive way you set the fills properties in an interactive way

 

(4biii)

Texture Fill tool: This is used to give 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.

 

(4ci)

Mesh fill tool

 

(4cii)

Interactive blend tool

 

*COMPUTER STUDIES*

 

(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.

 

(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.

 

(2a)

First, convert AB1¹⁶ into decimal, by using above steps:

= AB1¹⁶

= 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” = 0.3333333333333300.037037037037037

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

101000111²

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