📄 Exam Questions & Readable Text Transcript
Full OCR-extracted text of questions, syllabus codes, and exam instructions.
Extracted Content: 2023_comp_alevel_nov_paper2
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Candidate Name Centre Number Candidate NumberPoo Rogirstant Mazen
ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
General Certificate of Education Ordinary Level
COMPUTER SCIENCE 4021/2
PAPER 2 Structured
NOVEMBER 2023 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 at 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 is 100.
This question paper consists of 17 printed pages and 3 blank pages.
Copyright: Zimbabwe School Examinations Council, N2023.
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Candidate Name Centre Number Candidate NumberAnswer all questions.
1 (a) Explain any two characteristics of USB flash memory.
(b)
()
(b)
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3 (a) Most businesses have introduced electronic ways of doing business during
the lockdown period.
Define the term e-banking
(b) Give any two benefits of e-banking to the customer.
1,
2:
[2]
(c} Outline any two disadvantages of e-business to the employee.
1,
2.
[2]
4021/2 N2023
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L Candidate Name Centre Number Candidate Number 4 4 Below are four components of an expert system.Using arrows, link the four components to their correct definitions.
Provides reasoning
mechenlsms in a User Interface
typical expert system
Rule Base
Msde up of a series
of selecticn statement
(ifthe) calted inference
rules
collection of (ast
used to salve problems
In a expert term
(4)
§ (a) Convert the following decimal numbers to binary. Show all working.
(i) BA
Answer [2]
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(ii) 109}
Answer [2]
(b) Convert the following decimal numbers to denary. Show working
@ D4ie
Answer [2]
(ii) 16Fis
Answer [2]
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4 |Candidate Name Centre Number Candidate Number
6
(c) With the aid of'a diagram, illustrate a NOT gate and the truth table.
[2]
6 (a) State and explain any two data validation techniques.
[4]
(b) List any three ways of protecting data from hackers.
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Candidate Name Centre Number Candidate Number4
(c) Outline any three measures an organisation can use to recover lost data.
[3]
7 (a) Differentiate half duplex transmission mode from full duplex
transmission mode. Give examples of where each transmission mode is
used.
pataupler |
a as
“ i
(b) Explain any two characteristics of each of the following data transmission
media.
[2]
(i) coaxial cable
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Candidate Name Centre Number Candidate NumberSa
8
(ii) ‘fibre optic cable
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[2]
(c) Outline any three services that can be provided by the transport layer of the
OSI model.
1.
2.
3 [3]
(d) Explain any two advantages of using wireless fidelity (WIFI).
ip
2.
[2]
(e) Describe the following devices required to set up a computer network.
4021/2 N2023
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Candidate Name Centre Number Candidate Number9
() Explain any two services offered by Internet Service Providers (ISP).
|
2
[2]
8 (a) Explain the purpose of the following feasibility study techniques.
economic
operational
{2)
(b) Identify any two types of testing carried out at development stage.
1.
2,
[2]
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10
(c) Write any two differences between technical and user documentation.
(d) State any two disadvantages of classroom training.
12]
(e) Determine two factors to be considered when training users.
1,
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i2]
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Candidate Name Centre Number Candidate Number11
9 (a) Draw and label any two symbols used when drawing a program
flowchart,
[4]
(b) Give any two purposes of algorithms
1,
me
[2]
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ilCandidate Name Centre Number Candidate Number
12
(c) éi) Describe the selection construct.
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Gi) Draw a diagram that shows a sequence construct.
(2]
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Candidate Name Centre Number Candidate NumberCo)
13
10 (a) Differentiate the terms
(i) variable and constant,
[2]
(ii) local variable and global variable.
local variable global variable
[2]
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Candidate Name Centre Number Candidate NumberCe ee ee ee
14
(b) Explain the meaning of the statement “initializing a variable".
il (a) Define the term a foreign key.
[2]
&) Describe any two database objects.
1
2
[4]
(c) The following table shows part of data stored in the Players Table of a
certain football team.
PiayerID [Player Name [Position [Date Joined Team ___|
DFCOO! |James_ seeder __—_—*20-01-19
DFCO02 [Peter —CsStriker__—_—| 13-08-20
IDFC003<strong>|Andrew goalkeeper </strong> [01-04-20
IDFC004 |frevor_ _—=——sdefender__—*[16-06-19
IDFC007 idfielder 18-12-20
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0) The striker has cancelled his contract and needs to be removed
from the database.
Produce SQL statement to delete the striker from the above table.
Hint: On criteria, use the position field.
[3]
(ii) State the number of attributes shown in the Players table.
i
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12 (a) The following are elements of a web page
© English
e Computer Science
Write the pair of HTML tags between <body> and </body> which would
display the web elements as given above
<!DOCTYPE htmi>
<title> Our Curriculum</title>
<Shead>
<body>
<body>
</html>
[3]
(b) State any two HTML formatting tags
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13 (a) Explain the given intellectual property rights.
@ Patents
2)
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(ii) Trademarks
[2]
(b) Suggest any one ideal condition that influence business location.
[1]
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[ANON are
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4021/2 N2023
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