2020_comp_alevel_nov_paper2

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For Berfo

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMPUTER SCIENCE

PAPER 2 Structured

reat

4021/2

NOVEMBER 2020 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 is 100.

This question paper consists of 10 printed pages and 2 blank pages.

Copyright: Zimbabwe School Examinations Council, N2020.

© ZIMSEC N2020 [Turn over

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CS

2

Answer all questions.

1 Draw and label a block diagram of a computer system, showing the five basic
hardware components of a computer.

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Sas ini Sica os ieee Ua

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2 (a) A real time stock control system is used in a supermarket.
Describe what happens when an item is purchased.

[6]

(b) State any four advantages of using point of sale terminals in transactions. |

1

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[4]

(¢) Draw and label any network topology.

[3]

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3 (a) Explain the term protocol.

[2]
{b) Name any one computer networking model besides the Open System
Interconnection (OST) model, that exists.
(1]
(c) State any four levels of the OSI model, in their order.
i
2
3
4
[4]
(da) Define the term network topology.
[1]

(e) Differentiate the following terms.

simplex and duplex transmission mode

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email and ordinary mail

[4]

4 (a) Define the term data protection legislation.

[2]
(b) Write down any five points under the Data Protection Act.

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[5]
(c) List any three ways that data can be accidentally lost.

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2

[3]

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5 (a) Define the term algorithm.
[2]
(b) Draw and name the stages in systems development life cycle.
[7]
(ce) State any three tools that are used in the design stage of the systems
development life cycle.
1
2
3
[3]

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y)
6 Write an algorithm that inputs a set of numbers and outputs the number of positive For
numbers and the number of negative numbers. pee
[8]
7 (a) Write down the three types of programming constructs.
1
2
3
[3]
(b) Using a diagram, illustrate any one type of programming construct.
[2]

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Caneel Pee ENE Dae SOT)

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8 (a) Write a statement to display a title when designing a web.
[3]
(b) Define
(i) a tag;
[1]
(ii) an element.
[1]
9 (a) Convert the following binary numbers to octal.
() 1010010
Answer
[2]
(ii) 10010001
Answer
[2]

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(iit) =111011001
Answer
[2]
(b) Convert the following hexadecimal numbers to denary.
@ AFS5
Answer
[2]
(ii) 67B
Answer
[2]
10 Write SQL commands to select data from the table and delete a row.
[5]

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11 (a) Explain the meaning of Database Management System (DBMS).

[2]
(b) State any three functions of a Database Management System.

I

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12 (a) Identify any two factors that affect marketing strategy.

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[2]
(b) State any three elements of intellectual property.

1

2

[3]

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