2022_comp_alevel_nov_paper2

Extracted Content: 2022_comp_alevel_nov_paper2

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ZIMBABWE SCHOOL E

General Certificate of Education Ordinary Level

COMPUTER SCIENCE 4021/2

PAPER 2 Structured

NOVEMBER 2022 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 13 printed pages 3 blank pages.

Copyright: Zimbabwe School Examinations Council, N2022.

© ZIMSEC N2022 [Turn over

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Answer all questions.

1 (a) Name any three file management tasks that are done by a computer operating
system.

1. [1]
2. [1]

3. [1]

(b) Give any two advantages of buying a software package rather than writing a
program.
Li

[1]

N

[1]

(c) Complete the table below by writing down the appropriate data collection
device for the given application.

Data Collection Device

Reading information from a
credit/debit card.

‘hoosing an option from a customer
information screen at an airport.

Reading the results from a
uestionnaire where pencil lines were
sed to chose options.

(d) State any two differences between digital camera and traditional camera.
1

[3]

[1]

N

0)

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ae ee Been Ree

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2 (a) Eve Garage uses an expert system to find faults in car engines.
(i) Describe how an expert system can be used to find engine faults.

[3]

(ii) Give any two applications other than engine diagnosis that use an expert

system.
il [1]
2) []
(b) (i) Name any one household gadget used in a home other than a computer,
that contains a microprocessor.
[1]
(ii) State any two tasks that the microprocessor performs for the gadget
stated in b(i).
1, [1]
2. [1]
(iii) | Give any two advantages of using microprocessors to control devices.
Ig
[1]
2:
[1]

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3 (a) (i) Convert the characters below in ASC11.
' 1
; 1]

(ii) Convert 101101111 to hexadecimal.

(1)
(b) Which two gates are combined to make a NOR gate?
L. [1]
2. [1]
(c) State the number of bits in a nibble.
(1)
4 (a) Draw an AND gate.
[1]

4021/2 N2022

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Gn a Pn

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(b) Fill in the truth table for the NAND gate.

[2]
5 (a) Explain the term data transmission. Give one example.
[2]
(b) Explain, using a diagram, the half duplex data transmission mode.
[3]
(c) Mobile devices are connected to each other using internet or WPAN.
(i) Expand the acronym WPAN and give one example.
WPAN
[1]
Example [1]

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ay NS rn NNN EEE

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{ii) Internet connection allows users to send and receive emails.
Outline any two advantages of using emails over writing letters.

[1]
2.
01]
(iii) | Data on the mobile device can be stored online using cloud services.
Define the term cloud computing.
[1]
(d) Explain, using an example, what is meant by network protocol.
[3]
(e) Draw a well labelled mesh topology.
[3]

4021/2 N2022

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(Ce eeinnne! keene ReneS Re)

7
6 (a) (0) Define the term software piracy.
[1]
(ii) Explain any two risks, to the user, of using pirated software.
Ls
[1]
zs
{1]
(iii) List any two measures to reduce software piracy.
1.
[1]
z
[1]
(b) Name and explain any two online computer crimes.
1 1]
Explanation
[1]
2 [1]
Explanation
[1]
(c) State any one benefit of backing up data.
[1]

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7 (a) Give the differences between the two fact finding methods in the table
below.

interviews (Questionnaire

[2]
(b) Outline any two reasons why some employees might resist a new system.
1.
(1)
2.
[1]
(ec) State any two ways in which management can encourage employees to accept
the new system.
1.
[1]
2.
[1]
|
| (d) Explain any two types of data which can be used to test a system. Give
| examples.
1;
[2]
2.
[2]

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9

8 (a) Draw a flow chart for a program that accepts students! marks and displays
"PASS" or "FAIL".

Marks from 50 to 100 is a "PASS" whilst from 0 to 49 is a "FAIL".
If a mark is less than zero or more than 100, user should re-enter the
mark.

[5]

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(b) The flow chart below is used at Shumba-Liner. It inputs weight of bags
for passengers on the bus.
Parcels over 30 (thirty) kilograms are rejected and a value of -1 stops
further input into the system.

Total = 0
Reject = 0

Output
Total and
Reject

Reject
( Reject +1)

Total = Total
+ Weight

Complete the trace table for the program using the data below.

26 12 2,5 39 -1

[5]

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9 (a)

(b)

11

Define the term debug.

State and explain any two types of errors.

L.

10 Below is a table showing students! information at a college.

Student
INumber|

Student

Gender |Student Course
IName

Resident |Student Address

[1]

[2]

[2]

IN572

Phil

Joe Dube

Sithole IMotor Mechanics

[Business
[Mana

23 Rujeko Street

IN5423__ [Ray Gava

(a) State the data type for the fields below.
Student
Number
Resident

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Rm 13 Hostel 7

[1]
[1]

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(b)

Student Student Name\Gender Student Student
‘umber ourse ___|Address

Students

a

4

|
-
ee ee
al al

Write down the names of students who would appear in the query above.

[3]

(e) Explain why organisations choose to use a database for record keeping rather

than manually writing records in a book.

(d) State any two ways of securing database in an organisation.
1.

ll (a) State the meaning of the following tags as used in html.
</h>

</b>

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[3]

(1)

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13°
(b) Explain any three advantages of a website for an organisation.
L. [1]
2 [1]
3. [1]
12 (a) State any two business strategies.
1. [1]
2. [1]

(b) Explain the term intellectual property rights. Give an example.

[3]

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