2018_comp_alevel_nov_paper2

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Far Performance Mensirement

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

COMPUTER SCIENCE 4021/2
PAPER2 Structured

NOVEMBER 2018 SESSION 2 hours 30 minutes

Candidates answer on the question paper.
No additional materials are required.

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 and
your Centre number and Candidate number on the top right corner of every page of this paper.

Answer all questions.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of each question or part question.

This question paper consists of 14 printed pages and 2 blank pages.

Copyright: Zimbabwe School Examinations Council, 2018.
©ZIMSEC N2018 [Turn over

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(a) Define the terms below, giving one example.

(i) Hardware

[2]

(ii) Software

[2]

(b) List any three functions of a computer Operating system.

1
2:
3,

[3]

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(d)

Centre Number

*§ Candidate Number

Suggest any three applications of computers in agriculture.

iF

3]

State any three areas where super computers can be used.

1.

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[3]

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4

(a) Define the term Geographical Information System.

[2]
(b) State five components of an expert system.
LL, _
2:
3:
4.
=) [5]

(a) Convert the following base 2 numbers to base 10.

(i) 111010

(|

(ii) 101011

(1

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(c)

Centre Number _## Candidate Number

Convert the following base 10 numbers to base 2.

(i) 76

U1]

(ii) = 93

1]

Using the boolean expression
AB+C=F,

(i) draw the corresponding logic diagram.

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[3]

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a

(c) (i) ~—- Complete the Truth Table for AB + C=F.

[3]

Explain in detail the following network devices.

(a) Router
[2]
(b) Switch
—————— [2]
(b) Bridge
ee
a |

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(a) Explain the difference between data verification and data validation.

[2]

(b) Suggest any three measures to safeguard data against cybercrime.

im

(c) File permissions can be used as security measure.
List any five file permissions.

1,

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(c) 4,

oo eeeeeeeeSFSSeee

(a) Describe any three services provided by the internet.

1;

(b) Explain the following network protocols:

() HTTP

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(5]

[6]

(1]

we

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(ii) TCP/IP

[1]

(iii) VoIP

[1]

(a) Describe the maintenance /review/evaluation stage of the system
development life cycle,

—_—— Su ————CdSdSO(*“

(b) Explain any three testing strategies that are used in the development
and testing stage.

1,

[2]

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Centre Number Candidate Number
10
(b) 2.
[2]
3.
[2]

(a) Compare and contrast the Repeat ----Until and While ---- Endwhile
statements.

[4]
(b) — Using the two looping structures given in (a), draw the flow charts/
diagrams representing them.
09) Repeat--- Until While--- Endwhile
[6]

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9 State three properties of a database package.

1.

10 A web page is made up of a number of essential parts, which contribute to
the large whole.

Name any four essential parts of a web page.

1s

4, [4]

il Explain any: three types of errors in programming.

le

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Centre Number _®* Candidate Number

12

[5]

The table below represents an extract from a student file from a
certain college.

SURNAME

ROSA

(i)

FIRST
NAME

[| TOM | JOHN 20/03/83 BOX 72
re

JANE ROO7 19/04/84

Identify giving reasons, the field which can be used as a primary
key.

Primary Key.
Reason

[2]

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(b)

(a)

Centre Number Candidaie Nu

13

(i) Suggest two reasons why the age field is not necessary

imber
EOC

Reason |
eee

ee

Reason 2

[2]

Describe how to use the database in order to search for all students born
before 1980.

SS

Explain the meaning of the term business ethics.

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13]

[3]

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14

13 (b) Identify any three attributes of business ethics.

Ro

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