computing o level 2002 to 2008

8/12/2019 Computing O Level 2002 to 2008

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ANAGNORISISEducational Services

SAE

GCE / O LEVEL

S

A

E SAE*book available on Tablet and Mobile

COMPUTINGCOMPUTING

2002up to

2008


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Anagnorisis Services 2014

These past papers are FREELYand EASILYavailable on the world wide web. No one is forcing you to buy

this nor coercing you in any way. We value being organized and our free time. This material which has

been prepared by us for you will help you be more organized and save on precious time. The initial goal

was to make all the materials freely available on the internet for all students irrespective of their gender,

social status and beliefs. By making it free, we would have been able to reach and help only a small

number of students but it would make the latters not realize the value and hardworks associated with

these materials. By making these materials available against a price would make the students take the

materials more seriously and work these questions to help themselves have better results for their

examinations. Nevertheless if you are a needy student and cannot afford to buy our materials, kindly

contact us and we will do the necessary to try to help you as far as we can.

We are human beings who err and make mistake but we do not want to be punish and we seek to be

forgiven. For all our mistakes and errors we have made, we seek a way to be forgiven by THE CREATOR

by doing something useful and worthwhile. From the Holy Scriptures, we have come to realize that the

best of human are those who are the most useful and helpful to the rest of humanity. We have learned

that the best of us are those who enjoin others in doing good and forbid others in evil. We do not claimto be the best but we want to be good and do acts through which we will be forgiven. After reflection

and meditation, we have concluded that the best way to help others is not to give them a fish but teach

them how to fish. In the modern era we live, to get any work for a living we need to be educated and

have some kind of certificates, diplomas and degrees. We seek to help those students who seek to climb

the social ladder by working hard in their studies, get good result and thereby putting the chance on

their side for a good paying work. We are blessed to be living in this age and time where technology is

facilitating our lives, and we ought to make use of technology in most aspects of our lives. With the

internet and new technologies, the way that we seek knowledge, the way that we learn and teach

should evolve and attain a new dimension.

We believe that there is only one deity worthy of worship and when we shall write the name in capital

letters. From the Holy Scriptures that we have examined, we believed that there is only ONE LORD, who

is THE SATISFIER OF ALL NEEDS, THE GOVERNER, THE KING OF THE UNIVERSE, THE ORIGINATOR, THE

OWNER OF ALL, THE MOST MERCIFULAND MOST FORGIVING. We are doing what we are doing to fulfill

our purpose of our creation, which is to worship THE CREATOR OF THE UNIVERSE, to earn his pleasure

and forgiveness so that we are amongst the saved one on the final day.

We want that there is Peace, Justice and Liberty for all, social justice prevails as well as logical thinking

and the need to keep searching for knowledge to improve our lives and the lives of others. We

understand that it is only through education that we can make the change that we want. With the funds

that we shall receive, we will dedicate a portion of it to help others who do not have the financial

means but who have been intellectually blessed to seek knowledge and benefit both in this world and

in the hereafter. We want to help others so as to help ourselves to be saved on the day where THE

JUDGEwho is THE INSPIRER OF FAITHwill be angry and judge his creations. We sincerely pray that THE

WATCHFUL ONEwho is UNIQUE give all of us the best of this world and the best in the hereafter.


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1 Explain, using examples, the meaning of these computer terms.

(a) data logging ......................................................................................................................

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(b) check digit ........................................................................................................................

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......................................................................................................................................[2]

(c) serial access ....................................................................................................................

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......................................................................................................................................[2]

(d) assembler .........................................................................................................................

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......................................................................................................................................[2]

(e) handshaking .....................................................................................................................

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......................................................................................................................................[2]

2 Statethreeways that Data Protection Rules protect personal data.

1. ..........................................................................................................................................

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2. ..........................................................................................................................................

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3. ..........................................................................................................................................

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3 (a) Statetwosensors that could be used in a microprocessor-controlled washing machine.

1. ...................................................................................................................................

...................................................................................................................................

2. ...................................................................................................................................

...............................................................................................................................[2]

(b) Describe how the data collected by the sensors would be used by the control program.

..........................................................................................................................................

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4 (a) Statetwoways of preventing hackers from committing computer crimes.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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...............................................................................................................................[2]

(b) Describe how fingerprinting systems can be used to help catch criminals.

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5 (a) Statetwotasks done by robots on the production line in a car factory.

1. ...................................................................................................................................

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2. ...................................................................................................................................

...............................................................................................................................[2]

(b) Describe how a robot is able to move around the factory without bumping into anything.

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(c) Statetwoeffects on factory workers of robots being used in the manufacturing of cars.

1. ...................................................................................................................................

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2. ...................................................................................................................................

...............................................................................................................................[2]

6 (a) Explain why buffers are needed.

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(b) Give a reason for increasing the size of a buffer.

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(c) Explain the purpose of interrupts in the transmission of data to a printer.

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7 Images can be captured with a digital camera. Describe threeways that digital images canbe used with graphics software.

1. ..........................................................................................................................................

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2. ..........................................................................................................................................

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3. ..........................................................................................................................................

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8 The diagram shows part of a directory structure displayed by a windows-based operatingsystem.

(a) Name

(i) a root directory ..........................................................................................................

(ii) a sub-directory ......................................................................................................[2]

(b) Describe what happens to a floppy disk when it is formatted.

..........................................................................................................................................

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(c) Statethreetasks, other than formatting, that an operating system will do for a user.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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3. ...................................................................................................................................

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9 A hotel has decided to invest in a new computer system.

(a) Statethreetasks in the design of this new system.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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3. ...................................................................................................................................

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...............................................................................................................................[3]

(b) Statetwostages in the implementation of the new system.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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(c) Statetwoitems of user documentation that should be provided.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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...............................................................................................................................[2]

10 A database contains data about items that have been ordered from suppliers.

SUPPLIER CODE DELIVERY DATE PRICE ($)

A012 2146 28/09/02 44.99

C035 3724 30/09/02 249.50

M018 5613 05/10/02 98.15

L047 5613 11/10/02 102.75

P029 7215 17/10/02 127.50

R016 4639 19/10/02 22.89

(a) State a field that only contains numeric data.

......................................................................................................................................[1]

(b) Describe twovalidation checks that could be made on the DELIVERY DATE.

1. ...................................................................................................................................

...................................................................................................................................

2. ...................................................................................................................................

...............................................................................................................................[2]

(c) The following search condition is input.

(CODE= 5613) AND (PRICE($)


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11 A college offers courses which students access on-line. Students logon on to the coursesfrom their own homes.

(a) In order to enroll on a course a student needs to complete an on-line application formwhich includes the students name, address, telephone number, e-mail address and thecourse name. Design a screen input form for this enrolment.

[4]

(b) When the on-line students are studying a topic, they answer questions by typing theiranswers into a box. For example:

Answer:

Question: What is a CD-ROM?

Feedback:


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When a student has finished answering the questions, the answers are transmitted to atutor. The tutor gives feedback to the student about the answers. Give twobenefits tothe student of this type of learning.

1. ...................................................................................................................................

...................................................................................................................................

...................................................................................................................................

2. ...................................................................................................................................

...................................................................................................................................

...............................................................................................................................[2]

(c) At the end of the course, students do tests by selecting answers to multiple choicequestions. For example.

In previous years, students came to the college and answered the questions on paper.Now they stay at home and answer on-line. Give twoadvantages to the college of thenew system.

1. ...................................................................................................................................

...................................................................................................................................

...................................................................................................................................

2. ...................................................................................................................................

...................................................................................................................................

...............................................................................................................................[2]

How many bytes in a kilobyte?

8 100 1024

1000000


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12 The pie chart shows details of office expenses for three months.

(a) On the spreadsheet below, shade the cells that must be used to create the pie chart.

[2](b) Write down a formula that could be put in cell F2to calculate the average expenditure

on rent from July to September.

......................................................................................................................................[2]

(c) The zero in cell C3 was entered in error. State the cells in which the values shouldchange automatically when the correct amount is input.

......................................................................................................................................[2]

OFFICE EXPENDITURE (JULY)

RENT30%

ELECTRICITY10%

TELEPHONE40%

STATIONERY20%

A B C D E F

1 JULY AUGUST SEPTEMBER TOTAL ($) AVERAGE ($)

2 RENT 72 72 106 250

3 ELECTRICITY 24 0 66 90 30

4 TELEPHONE 96 90 114 300 100

5 STATIONERY 48 38 64 150 50

6 TOTAL 240 200 350 790


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13 Read this algorithm.

setTotal_1to zerosetTotal_2to zerosetCounterto onewhileCounter< eight

Counter=Counter+ 1inputNumberifNumber> zero then Total_1 = Total_1+NumberifNumber< zero then Total_2=Total_2 +Number

endwhileoutputTotal_1outputTotal_2

(a) Write down the output if the following set of numbers are input.

4, 1, -3, 2, -5, 0, 6

......................................................................................................................................[2]

(b) Modify the algorithm so that it will accept any number of numbers, the input isterminated by a rogue value and the output is the Totalof all the numbers input exceptthe rogue value.

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14 A tourist information centre has its own web site.

(a) Explain the purpose of the modem and the Internet Service Provider (ISP) that thecentre uses.

Modem

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

Internet Service Provider (ISP).

..........................................................................................................................................

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..........................................................................................................................................

......................................................................................................................................[3]

(b) Describe twoways that information about visitors to the web site and their requirementscould be collected by the web pages.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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15 Describe how an expert system would identify types of plants.

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16 (a) Statetwocauses of systems failure.

1. ...................................................................................................................................

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2. ...................................................................................................................................

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(b) Statetwoways the data can be protected against systems failure.

1. ...................................................................................................................................

...................................................................................................................................

2. ...................................................................................................................................

...............................................................................................................................[2]

17 A computer is used to control the traffic at a busy road junction.

(a) State an input device that should be used.

......................................................................................................................................[1]

(b) State an output device that could be used.

......................................................................................................................................[1]

(c) Describe the processing done by the computer to control the output device.

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18 A company uses the following systems flowchart for on-line order processing and invoicing.

Write the terms from the list below into the correct symbols in the flowchart. One term hasbeen done for you.

customer orders

invalid ordersinvoicesorder entryorder filestock fileupdate processvalidation process

[4]

orderentry


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19 Using pseudo code or otherwise, write an algorithm which will input any three differentnumbers and then print them out in ascending order.

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1 Explain, using examples where appropriate, the meaning of these computer terms.

(a) check sum

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......................................................................................................................................[2]

(b) relational database

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..........................................................................................................................................

......................................................................................................................................[2]

(c) random access memory (RAM)

..........................................................................................................................................

..........................................................................................................................................

......................................................................................................................................[2]

(d) top-down design

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......................................................................................................................................[2]

(e) alphanumeric characters

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2 State two ways that computer-based learning (CBL) has affected learning and testingmethods.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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3 (a) Statetwosensors that would be used in a microprocessor-controlled camera.

1 ......................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

2 ......................................................................................................................................

..........................................................................................................................................

......................................................................................................................................[2]

(b) Describe how the data collected by the sensors would be used by the cameras controlprogram.

..........................................................................................................................................

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4 (a) Statetwotypes of computer crime.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(b) Describe twoways of protecting against computer crime.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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5 (a) State the purpose of a compiler.

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(b) Stateonedifference between a compiler and an assembler.

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6 State the purpose of an interrupt when data is sent to a disk drive.

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7 Digital photographs stored on a computer are going to be used in a multimedia presentation.

(a) Statetwoways in which these photographs can be edited using graphics software.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(b) Describe how the edited photographs can be inserted into the multimedia presentation.

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(c) Stateone multimedia element that could be included in the presentation other thangraphics and text.

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(d) Describe the mulitmedia hardware that would be needed for developing and displayingthe presentation.

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8 (a) Draw and label a diagram to show the relationship between a root directory, a sub-directory and a file.

[3]

(b) Statetwofile management tasks that would be carried out by an operating system.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(c) Explain how the operating system will deal with errors that occur whilst a program isrunning.

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9 A shop owner wants to change from a manual stock control system to a computerised stockcontrol system.

(a) Statethreereasons why the shop owner would want a computerised system.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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3 ......................................................................................................................................

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(b) Describe threemethods of fact-finding that would be used to analyse the manual stockcontrol system.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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3 ......................................................................................................................................

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10 A multi-national company allows employees to telework or work at home and communicatewith the office using the Internet.

(a) State the hardware, software and services required to access and use the Internet.

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(b) Statetwoways that a report could be sent to the office using the Internet.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(c) State two of the additional items of hardware that would be required for videoconferencing.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(d) Give onebenefit to the company of using video conferencing.

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(e) Give twodisadvantages for the employee of teleworking.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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11 The following pie chart shows the total value of watch sales in April 2003:

(a) On the spreadsheet below, shade the cells that must be used to create the pie chart.

[2]

TOTAL WATCH SALES ($) - APRIL 2003

Day date475

Databank165

Calendar304

Water resistant230

Wap2200

A B C D E F

Amount Stock Total1 Stock Sold Left Price ($) Sales ($)

2 Wap 20 10 10 220 2200

3 Water resistant 10 2 8 115 230

4 Calendar 5 4 1 76 304

5 Databank 15 5 10 33 165

6 Day date 10 5 5 95 475

7 Total 3374


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(b) State the format of the data in column B.

......................................................................................................................................[1]

(c) ColumnsD,EandFcontain formulae. Write down a formula that could be in cell F7tocalculate the Total Sales.

......................................................................................................................................[1]

(d) The value in C5 is changed to 6. State the cells in which the values should changeautomatically.

......................................................................................................................................[2]

(e) Give onebenefit of using a template for this spreadsheet.

......................................................................................................................................[1]

12 An estate agent keeps a file of properties for rent in the city. Several records are shown inthe following diagram:

(a) Which field in the file should be used as a key field?

......................................................................................................................................[1]

(b) State a validation check that should be made on the AREA data as it is enteredinto the file.

......................................................................................................................................[1]

REF AREA TYPE FEATURE RENT($)

H002 South Detached Waterfall 21000

H006 South Bungalow Pool 19000

H008 West Bungalow Pond 15000

H005 South Detached Patio 14000

H003 North Semi-Detached Pool 12000

H009 North Detached Courtyard 11000

H004 West Bungalow Pool View 9000

H001 South Semi-Detached Fish Pond 8000

H007 North Terraced BBQ Pit 2000


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(c) WhichRENT($)data will be listed if the following search condition is input?

(FEATURE = Pool) OR (TYPE = Bungalow)

......................................................................................................................................[2]

(d) Write down a search condition to find all the properties in the south which have a rentless than $15000.

......................................................................................................................................[3]

(e) Write down the reference numbers if the file is sorted in ascending order on TYPEthenAREA.

......................................................................................................................................[3]

13 Read this algorithm.

inputA, B

ifA>Bthen

T = A

A = B

B = T

endif

outputA, B

(a) Write down the output if the following two numbers are input:

41, 38

......................................................................................................................................[1]

(b) Explain the purpose of the variable T.

..........................................................................................................................................

......................................................................................................................................[1]

(c) Explain why an algorithm is written as a subroutine (procedure) and stored in a programlibrary.

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14 A bank stores personal data about its customers on a computer file.

(a) State two ways that data protection laws protect personal data stored on computersystems.

1 ......................................................................................................................................

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2 ......................................................................................................................................

......................................................................................................................................[2]

(b) Statethree items of personal data, in addition to the customer account number, thatwould be stored.

1 ......................................................................................................................................

2 ......................................................................................................................................

3 ..................................................................................................................................[3]

(c) The customer account number contains a check digit. Describe how this check digit iscalculated.

..........................................................................................................................................

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(d) State a reason for updating a customers details and describe the processing that wouldbe done by the computer system.

Reason

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Processing

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15 Describe how an expert system could help a doctor to diagnose illnesses.

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16 A coffee pot is to be designed using a computer-aided design (CAD) program.

Statefourbenefits of using a CAD program to do this.

1 ..............................................................................................................................................

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2 ..............................................................................................................................................

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3 ..............................................................................................................................................

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4 ..............................................................................................................................................

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17 A school wants to monitor the number of hours spent by a class of 30 students on theInternet.

Using pseudocode or otherwise, write an algorithm which will;

for each student, record the times logged on and logged off

calculate the length of time each student spends online calculate and output the average length of time per day spent by each student on theInternet.

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1 Explain, using examples where appropriate, the meaning of these computer terms.

(a) buffer

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(b) verification

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(c) gigabyte

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(d) batch processing

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(e) file generations

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2 A computer system is described as having the following features:

512 Mbyte RAM

internal modem

A4 colour scanner

(a) State the purpose of each of these.

RAM ..................................................................................................................................

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modem ..............................................................................................................................

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scanner .............................................................................................................................

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(b) Statetwoother types of hardware which would be required for electronic conferencing.

1 ......................................................................................................................................

2 ..................................................................................................................................[2]


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3 Hackers can gain illegal access to computer systems.

(a) Statetwoeffects of computer hacking, other than changing, deleting or copying data.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(b) Statetwoways in which users can protect their computers against hacking.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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4 A small company has decided to link several stand-alone computers together to form a LocalArea Network (LAN).

(a) Statetwoadvantages of LANs.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(b) Statetwodisadvantages of LANs.

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2 ......................................................................................................................................

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5 Customers of a bank are issued with plastic credit cards which have a magnetic stripe on theback.

(a) Give twoitems of information stored on the magnetic stripe.

1 ......................................................................................................................................

2 ..................................................................................................................................[2]

(b) To help prevent forgeries, the credit card has security features. State two of thesefeatures.

1 ......................................................................................................................................

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2 ......................................................................................................................................

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(c) Credit cards can be used to obtain cash from an Automatic Teller Machine (ATM).Explain why a PIN is needed to obtain cash from this machine.

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......................................................................................................................................[2]

6 A large company decides to convert all its offices from a paper-based system to anelectronic-based system. Unions are concerned about the possibility of electronic scabbing.

(a) Explain electronic scabbing.

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(b) Give threeproblems, other than electronic scabbing, which may arise when changingover to the electronic office.

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2 ......................................................................................................................................

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3 ......................................................................................................................................

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7 A systems analyst has recommended that Mr Page computerises his book sales business.Give threeitems of documentation which the systems analyst would need to provide whenthe system is implemented.

1 ..............................................................................................................................................

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2 ..............................................................................................................................................

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computing o level 2002 to 2008

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