2021_comp_alevel_nov_paper2

Extracted Content: 2021_comp_alevel_nov_paper2

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Candidate Name Centre Number Candidate Number

5
Five Poop

ZIMBABWE SCHOOL EXAMINATION S COUNCIL

General Certificate of Education Ordinary Level

COMPUTER SCIENCE 4021/2

PAPER 2 Structured
NOVEMBER 2021 SESSION 2 hours 30 minutes
Candidates answer on the question paper

No additional materials are required.
Calculators must not be used in the examination.

Allow candidates 5 minutes to count pages before the examination.

This booklet should not be punched or stapled and pages should not be removed.
Time 2 hours 30 minutes

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces at the top of this page.

Write your centre and candidate number in the box on the top right corner of every page of this
paper.

Check that all the pages are in the booklet and ask the invigilator for a replacement if there
are duplicate or missing pages.

Answer all questions.
Write your answers in the spaces provided on the question paper using black or blue pens.

INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper 1s 100.

This question paper consists of 13 printed pages 3 blank pages.

Copyright: Zimbabwe School Examinations Council, N2021.

© ZIMSEC N2021 [Turn over

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EE a ee ace ea ceatk eR

1 (a) The following table shows four applications which require specialist input
devices.

application input device a for cheige of
Virtual reality application

ja person with disability

communicating with a computer

system

automatic stock control system at
a supermarket

information kiosk at an airport
using a GUI (graphic user
interface)

For each application, suggest one input device and give a reason for your
choice. [8]

(b) — Write down any one difference between the terms off-the-shelf and tailor
made software.

iene ws pee ts ee |
2 Give any two uses of computers in each of the following areas:
(a) hospital
1
2 _
= [2]

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Candidate Name Centre Number Candidate Number

(b) education

1 r
2 r 2
_ pope su [2]
3 (a) _ Discuss any four benefits of online banking.
| ages aerate EMU oe Lie aL aie} a
2 = = : =
3 on “ oan
4 seas os a
ae a - [4]
(®) Which banking transaction can be done through traditional banking but
not through online banking.
[1]

(©) State any two benefits of computer-aided design.

1

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Candidate Name Centre Number Candidate Number 2 [2] 4 (a) —_ Define the term subprogram. al [2]

(b) Give any three advantages of subprograms.

1 =

ot [3]

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5 Networks can be ring, bus or star topology.

(@) Name and draw any two topologies stated above.

[6]

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tae ee ee Bee

(b) State any one benefit and any one drawback of using each of the following
communication methods used in business:

@ mobile phone

benefit [1]

drawback. [1]

(ii) ~—_—- video conferencing

benefit {1]

drawback [1]

(iit) = email

benefit [1]

drawback. {1]

(b) Describe any other application of mobile phones besides access to the
internet.

[2]

6 Hackers may use their technical skills to gain unauthorised access into computers or
networks.

(a) State any four prevention measures against hacking.

1

2

4 [4]

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Candidate Name Centre Number Candidate Number

(®) _List any three protection measures against accidental data loss.

1

2

3 = : [3]

(©) State any three unethical practices which may be done by youths when
they are in an internet environment.

7 A new computerised information system is designed to keep students' records,

(a) Suggest any four fact-finding techniques that can be used by the
systems analysts.

4 [4]

(6) State any four activities carried out during the design stage of the systems
development lite-cycle.

1

4 [4]

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Candidate Name Centre Number Candidate Number (c) Describe any one type of test data. [2] 8 A school office sells stationery items to learners. A database used to keep details of

stock is shown below.

Code Item In Stock _| Sold [ On Order Price (S)

G302_—| Floppy disk 24 : 16 20 J 1.50

G101 Rubber 16 10 1,00
30 1.00

Pencil

G103 Protractor
+ M101 Pen [| _'18 22 | 20 2.00
M202 Compass 8 12 20 2.00

(a) Write a query that extracts items with prices less than $2.00.

[3]

(b) Write down the items output if the search below is used.
code contains "m" or [in-stock<15]

[3]

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Candidate Name Centre Number Candidate Number («) Differentiate the terms below. 0) string and numeric data [2] Gi) ~~ a field and a record = fence ty 9 The economic environment of a business plays an important role in determining

its success or failure.
State any five economic factors that can affect computer-based businesses.

1

5 [5]

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10 Centre Number Candidate Number

Candidate Name

10 Daily temperatures were recorded ten times a day by learners over a period of a year.
(assume that a year contains 365 days)

Write an algorithm, using pseudocode or flowchart which performs the actions below.

inputs all the temperatures (ten per day)

outputs the highest temperature taken over the year
outputs the lowest temperature taken over the year
outputs the average temperature per day

outputs the average temperature per year

[10]

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il Candidate Name Centre Number Candidate Number

ec ie ea Ae gee eto ca eee ea

11 (a) Define the term byte, giving an example.

E ee ee [2]
(b) — The acronym ASCII stands for
Slee ae : [1]
© @ — Convert
101011, to base ten.
[1]
Gi) ~—— Calculate

11001,

- 110,
2 [1]

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@ @ Draw a circuit diagram of the function

F-A+ ZB

[3]

(i) For the function in d@), find the output of F when
A=OandB=1.

[2]

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oa aera een ST ial ee aS Hn eee,

12 (a) _— Define the terms below.

@® html

= a (1)
Gi) ~~ cookie
: [1]
(b) State any three features found on a good website.
1 a F ie
2 ——e 2 2
3 ee pet cie ese [3]

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