0418 01 information technology - · pdf fileuniversity of cambridge international...

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS

International General Certificate of Secondary Education

MARK SCHEME for the May/June 2006 question paper

0418 INFORMATION TECHNOLOGY

0418/01 Paper 1 maximum raw mark 120

This mark scheme is published as an aid to teachers and students, to indicate the requirements of the

examination. It shows the basis on which Examiners were initially instructed to award marks. It does

not indicate the details of the discussions that took place at an Examiners’ meeting before marking

began. Any substantial changes to the mark scheme that arose from these discussions will be

recorded in the published Report on the Examination.

All Examiners are instructed that alternative correct answers and unexpected approaches in

candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills

demonstrated.

Mark schemes must be read in conjunction with the question papers and the Report on the

Examination.

The minimum marks in these components needed for various grades were previously published with

these mark schemes, but are now instead included in the Report on the Examination for this session.

• CIE will not enter into discussion or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the May/June 2006 question papers for most IGCSE and

GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level

syllabuses.

Mark Scheme Syllabus Paper

IGCSE – May/June 2006 0418 1

© University of Cambridge International Examinations 2006

1 A Joystick

B Digital camera

C Memory stick

D Mouse

E Keyboard

1 mark each 5 marks

2 Bar code reader

Joystick

1 mark each 2 marks

3 Control program typing letters

Database automatic washing machine

Measuring program storing records of books in a library

Search engine monitoring rainfall in a weather

station

Word processor doing research on the Internet

1 mark each correct arrow 5 marks

4 Evaluation

Implementation

Implementation

Evaluation

1 mark each 4 marks

5 Magnetic Stripe reader

Keypad

Bar code reader

1 mark each 3 marks

6 6

50

RIGHT

END REPEAT

RIGHT 180/LEFT 180/PENUP/LEFT 90

FORWARD 60

PENDOWN

REPEAT 4

FORWARD 60

RIGHT 90

6

50

RIGHT

END REPEAT

PENUP

FORWARD -60

PENDOWN

REPEAT 4

BACKWARD 60

LEFT 90

Each pair of 2 statements 1 mark each 5 marks

Any solution which works will gain credit.




7 (a) Three methods and three corresponding advantages from:

Parallel running/implementation 1 mark

Information is not lost/always a second copy 1 mark

Phased implementation 1 mark

Still have most of system if things go wrong/ no expense of running two systems together

1 mark

Direct implementation/changeover 1 mark

Time is not lost/do not have expense of running two systems together 1 mark

Pilot running 1 mark

Still have most of system if things go wrong/ no expense of running two systems together

1 mark

6 marks max

(b) Normal data is data which is within an acceptable range/ is usual for the situation 1 mark

Between 0 and 500 (<500 is acceptable as is an example in the correct range 1 mark

Extreme data is data which is at either end of a normal range of data 1 mark

0 and 500 1 mark

Abnormal data is data which is outside the acceptable range/ is of the wrong data type

1 mark

Any negative number or number greater than 500 or text example 1 mark

(c) Three from:

Program listing/algorithm

List of variables

File structure

Purpose of the system

Screen layouts

Print formats/report formats

Purpose of the program

Hardware requirements/information

Software requirements

Sample runs

Known bugs

Validation rules

Systems flowchart (1 mark for writing flow chart only)

Program flowchart 3 marks

8 Three from:

ROM cannot be changed

RAM can be read from and written to

ROM is read only memory and RAM is random access memory

ROM holds instructions that need to be unchanged such as BIOS/program cycles in a washing

machine/program instructions in games such as gameboys, playstations etc.

RAM holds the work that is being currently done by the user

Ram is volatile/ROM is non-volatile

3 marks

9 (a) (b)

1 mark each 2 marks




10 (a) Direct/random not RAM 1 mark

(b) Harry Potter and the Philosopher’s Stone 1 mark

(c) Must be device

Borrower - bar code reader/magnetic stripe reader 1 mark

Book - bar code reader 1 mark

(d) Quicker to input 1 mark

Less likelihood of errors on input 1 mark

(e) Two from:

check digit

length check

type check – all digits

existency check 2 marks

(f) Paperback or hardback 1 mark

(g) Text/alphanumeric/string 1 mark

(h) Code number 1 mark

(i) Five from:

computer reads a record from the book file

compares the date due back

with 27th

May

if date due back is less/earlier than 27th

May

using the borrower number

reads the corresponding record from the borrower file

address is read from record

mail merged letter/email is generated

otherwise reads next record and repeats above

until end of file 5 marks

11 Booking a flight using a computerised booking system

Withdrawing money from a cash machine

1 mark each 2 marks

12 (a) any cell from B4 to E7 1 mark

(b) five 1 mark

(c) D4-C4 1 mark

(d) centred 1 mark

(e) =SUM(E4:E7) / =E4+E5+E6+E7 1 mark




13 (a) Each field must have appropriate space for answers or be example

Personal data (name, address, phone, date of birth, etc.) 2 marks for 4 items, 1 for 3 items

else 0

Parent’s name and phone number/ e-mail address

Space for minimum of two lines of medical condition(s)

Information fills the page and clearly be an input screen form 5 marks

(b) Three from:

Field Name

Field Type

Field Length

Key Field

Validation Check

Index

Input mask 3 marks

(c) Two from:

Data could be changed

Data could be deleted

Data could be distributed to anybody 2 marks

(d) Three from:

Password protect computer

Password protect file

Keep computer/removable media locked securely away when not in use

Encrypt data

Keep data on removable storage medium only

Anti-spyware

Firewalls 3 marks

14 (a) OMR 1 mark

(b) a disc 1 mark

(c) e-mail 1 mark

15 TRUE

FALSE

FALSE

FALSE

1 mark each 4 marks




16 (a) Five from:

Save spreadsheet

Load images from clipart

Download images from the Internet

Scan images

Upload images from digital camera

Load word processing software

Insert pictures/import pictures/copy and paste pictures

Insert spreadsheet/import spreadsheet/copy and paste spreadsheet/embed spreadsheet

Type in text

Insert file/paste chart

Format reports

Edit images

(Max three marks from ‘images’) 5 marks

(b) Moisture/humidity sensor 1 mark

light sensor 1 mark

(c) Sensors measure analogue quantities 1 mark

computers use digital data 1 mark

(d) Analogue to digital converter 1 mark

(e) Two from:

Computer readings are more accurate

Readings can be taken continuously

Humans cannot work without a break

Actions are taken immediately

Readings can be taken at night/during the holidays 2 marks

(f) Five from:

temperature read from temperature sensor

computer compares this temperature

with preset value

if lower computer/microprocessor switches heater on

if lower computer/microprocessor closes windows

if higher computer/microprocessor switches heater off

if higher computer/microprocessor opens windows

if still higher computer/microprocessor switches fan on

and repeats continuously 5 marks

17 (a) Two from:

flight simulations

driving simulations

nuclear power stations

simulating traffic flow

any civil engineering situation which can be modelled

1 mark for each 2 marks

(b) Two from:

too expensive to build real thing

too large a time scale required

wasteful of materials

variables can be easily changed/different scenarios can be easily used 2 marks




18 Input – symptoms are typed in/input direct from data logger/embedded computer

processing

expert system compares symptoms

with those in the knowledge base

using inference engine

using rules base

matches are found

Output – suggested/probable faults 4 marks

19 Eight from:

Customer – advantages

Don’t have to waste time travelling (long distances to banks)

Disabled people don’t have to travel to bank/leave home

Easier for customers to make transactions

Don’t have to spend money on travelling expenses travelling (long distances to banks)

No embarrassment of having to ask for loans face to face

Can bank when banks are closed

Don’t have to wait for post/immediate payments can be made

Less danger of mugging

Customer – disadvantages

Lack of socialising/social contacts

Hackers may intercept data and defraud customer

Deprived of personal touch

Easier for customers to mismanage accounts

Phone bills can increase

Without broadband other family members cannot use the phone

Cannot deposit/withdraw cash/money

More vulnerable to phishing

Customers must have a computer/Internet access/(basic) computer skills

Bank – advantages

Fewer cashiers needed – less spent on wages

Fewer branch offices needed – less spent on rates/rent

Less actual cash handled – fewer robberies

Less money spent on security staff

Bank – disadvantages

Lose customers due to lack of personal touch

Initial outlay on computers expensive

Greater risk of fraud so lose money

Need to retrain staff 8 marks


International General Certificate of Secondary Education MARK SCHEME for the October/November 2006 question paper


0418/01 Paper 1, maximum raw mark 120

This mark scheme is published as an aid to teachers and students, to indicate the requirements of the

examination. It shows the basis on which Examiners were instructed to award marks. It does not

indicate the details of the discussions that took place at an Examiners’ meeting before marking began.



demonstrated.

Mark schemes must be read in conjunction with the question papers and the report on the

examination.

The grade thresholds for various grades are published in the report on the examination for most

IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses.

• CIE will not enter into discussions or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the October/November 2006 question papers for most IGCSE,


syllabuses.


IGCSE - OCT/NOV 2006 0418 1

© UCLES 2006

1 A Laptop computer

B Speakers

C Inkjet printer

D Web cam

E Monitor

1 mark each 5 marks

2 Memory Stick

Hard disc

1 mark each 2 marks

3 FALSE

TRUE

TRUE

TRUE

1 mark each 4 marks

4 Optical Mark reader printing out car designs

Plotter reading information from credit cards

Magnetic stripe reader choosing from set of options

Touch screen making backup copies

Zip drive reading information from students’ exam answers

1 mark each correct arrow 5 marks

5 Database software

Spreadsheet software

Word processing software

1 mark each 3 marks

6 (a) OCR

(b) direct

(c) sensor

1 mark each 3 marks

7 (a) (i) ring 1 mark

(ii) bus 1 mark

(b) Local area network 1 mark



© UCLES 2006

8 FORWARD 20 FORWARD 20

RIGHT 90 RIGHT 90

PENUP PENUP

FORWARD 5 FORWARD 5

PENDOWN PENDOWN

FORWARD 20 OR FORWARD 20

RIGHT 90 RIGHT 90

FORWARD 50 FORWARD 50

RIGHT 90 REPEAT 2

FORWARD 25 RIGHT 90

RIGHT 90 FORWARD 25

FORWARD 25 END REPEAT

1 mark each group of statements 5 marks

9 (a) two from

Observation 1 mark, Watching people in their work practices – 1 mark

Questionnaires 1 mark, recording of responses to questions to users about the

system – 1 mark

Interviews 1 mark, face to face questions to users about the system – 1 mark

Examining documents 1 mark, looking at/through current paperwork – 1 mark 4 marks

(b) four from

data capture forms

input screens/user interface

report layouts

output screens

validation routines

queries/searches

macros 4 marks

10 suitable example for on-line processing i.e. booking systems, cash machines, EFTPOS 1 mark

suitable description such as input data is acted upon immediately and files updated immediately 1 mark

suitable example for batch processing, such as cheque processing, payroll, utility bills, stock control

(some types) 1 mark

suitable description such as data is collected altogether before being input to the system/data is

processed in one go 1 mark

11 (a) two from

ROM cannot be changed/RAM can be changed


ROM is read only memory and RAM is random access memory

ROM is non-volatile/RAM is volatile 2 marks

(b) holds instructions that need to be unchanged such as BIOS/program cycles in a washing

machine/program instructions in games such as gameboys, playstations, etc. 1 mark

12 (a) range check 1 mark

(b) (i) 0/45/60 1 mark

(ii) 0/60 1 mark

(iii) 87 1 mark

(c) (i) =if(d2<35,“Fail”,“Pass”) / =if(d2>=35,“Pass”,“Fail”)

1 mark for correct condition

1 mark for “Pass”, “Fail” 2 marks



© UCLES 2006

(ii) highlight e2 to e32 – 1 mark

click on fill down – 1 mark

OR

highlight e2 and show fill handle – 1 mark

drag down to e32 – 1 mark

OR

highlight e2 and click on copy – 1 mark

highlight e3 to e32 and click on paste – 1 mark 2 marks

(d) Spreadsheet

Spreadsheet

Word processor

Spreadsheet 4 marks

(e) two from:

real thing may be:

too dangerous

too large a time scale required

wasteful of materials/too expensive to build

It’s easier to alter a model

Any other suitable answer 2 marks

13 (a) computers work with digital data 1 mark

analogue data must be converted into data which the computer can understand 1 mark

(b) analogue to digital converter/ADC 1 mark

(c) two from:

Computer readings are more accurate.

Readings can be taken more frequently/continuously.

Nurses can get tired and forget to take readings.

Nurses are so busy they might not be able to take readings regularly.

Up to date readings. 2 marks

14 (a) four from:

input screen asking for sample details

sample details are typed in

expert system compares them with those in the knowledge base

using inference engine

percentage probability is suggested for each mineral

user makes decisions based on output 4 marks

(b) two from:

Car fault diagnosis

Medical diagnosis

Tax

Chess games

Animal/Plant identification

Weather forecasting 2 marks



© UCLES 2006

15 (a) (i) direct/random 1 mark

(ii) hard/floppy disc/zip disc/jaz disc 1 mark

(b) two from:

pupil changes phone number

pupil changes address

pupil changes form/year/grade

medical history changes

pupil gains qualifications

pupil leaves school

pupil changes name/parents 2 marks

(c) two from:

put password on computer

put password on file

lock office door when not in use

encrypt data

stores data on removable medium/device/removes data to secure location 2 marks

(d) A copy of file(s)/data 1 mark

stored on alternative medium/in a separate room 1 mark

to be used in case original is corrupted 1 mark 16 (a) user id/account number 1 mark

password/PIN 1 mark (b) two from:

Don’t have to waste time travelling long distances to banks.

Don’t have to spend money on travelling expenses travelling long distances to banks.

No embarrassment of having to ask for loans face to face.

Can bank when banks are closed.

Personal security reasons.

People with disabilities find it easier. 2 marks (c) two from:

fewer cashiers needed – less spent on wages

fewer branch offices needed – less spent on rates/rent

less actual cash handled – fewer robberies 2 marks (d) two from:

use of encryption key

encoding of data

so that data is unintelligible

needs translating using a special key 2 marks (e) two from:

Security of information transmitted over the internet.

Lose personal touch.

Less opportunity for socialising with friends/neighbours.

More expensive phone bills.

Lack of exercise.

Might not be able to use the phone if Internet is dialup.

Might be domestic disputes over whose turn it is to use the Internet. 2 marks 17 five max from:

ISBN

Book data (title, author, category, hardback/softback, publisher, particular shop/branch,

any other suitable item of data.) – 2 marks for 4 items, 1 for 3 items else 0

Selling price/cost price

Information fills the page and is clearly an input screen

Appropriate spaces after each field 5 marks



© UCLES 2006

18 (a) (i) bar code reader/keypad 1 mark

(ii) magnetic stripe reader/keypad (only if not given in i) 1 mark

(b) five from:

product number is validated

using check digit

product number is compared with each item

a match would be made with 002136987421

number in stock is reduced by 1

163 becomes 162

Number in stock/162 is compared with…

…is compared with re-order level.150

If equal then needs re-ordering 5 marks

(c) four from:

PIN is checked

supermarket computer contacts bank computer

using sort code present on card

expiry date check carried out on card

existency check carried out on card/account number

matching account details looked up on file

balance/credit check is carried out on account

if available funds present money is deducted from account and added to supermarket

bank account/transferred from customer account to supermarket account 4 marks

19 (a) two from:

take photos using a digital camera – 1 mark

download from camera and save – 1 mark

OR

take photos using traditional camera – 1 mark

scan the developed photo/develop onto CD ROM and save – 1 mark

OR

find images on the Internet – 1 mark

copy and paste/download images – 1 mark

OR

find appropriate images of Clipart – 1 mark

copy and paste/download images from a CD ROM – 1 mark

OR

scan images – 1 mark

save images – 1 mark

OR

use of art/drawing package – 1 mark

save image – 1 mark 4 marks

(b) three from:

create new slide

import/insert/copy and paste images

insert sound file

create text box

type in text (in text box) 3 marks



© UCLES 2006

20 seven from:

pupils:

advantages:

much wider source of knowledge

up to date information

better quality diagrams/charts

easier to find relevant information

(use of emails) so no need to carry bags

disadvantages:

can easily get sidetracked looking at irrelevant sites

can be lulled into plagiarism

need to acquire skills in searching techniques

teachers:

advantages:

can set more demanding tasks

can have work emailed to them

work is more presentable – easier to mark

pupils find learning more interesting

more interesting resources available

disadvantages:

difficult to know if it is the pupil’s own work

too many emails can overload teacher and/or system

viruses can cause system to break down

school:

advantages:

pupils more motivated – better exam results

pupils more motivated – better school environment

disadvantages:

pupils may access unsavoury sites

pupils may download coursework

expense of networking/ISP rentals

expense of phone bills

one for reasoned conclusion 8 marks


International General Certificate of Secondary Education MARK SCHEME for the May/June 2007 question paper


0418/01 Paper 1 (Written), maximum raw mark 120

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of

the examination. It shows the basis on which Examiners were instructed to award marks. It does not




demonstrated.


examination.


CIE is publishing the mark schemes for the May/June 2007 question papers for most IGCSE, GCE

Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.



© UCLES 2007

Question

Number

Answer Part

mark

1

A Microphone B Light pen

C Remote control D Memory stick

E Numeric keypad

1 each

2 Plotter

Robot arm

1

1

3 (a)

(b)

(c)

(d)

an OMR sheet

A bank cheque

a CD RW

a dot matrix printer

1

1

1

1

4 False

True

False

False

False

1

1

1

1

1

5 memory stick

DVD R

fixed hard disk drive

1

1

1

6 Right 90

Forward 75

Right 90

Forward 75

Penup

Forward 85

Pendown

Forward 65

Right 90

Forward 75

Right 90

Penup

Forward 40

Pendown

Forward 35

1 mark for each group of 3 statements

5



© UCLES 2007

Question

Number

Answer Part

mark

7 (a) Three from:

Temperature

Moisture

Humidity

Light

pH

Gas sensor (O2, CO2)

3

(b) Three from:

Name + what variable is changed.

water sprinkler/humidifier - humidity

heater/cooler/air con. - temperature

light bulb – light intensity/level

motor for opening/closing windows - temperature

fan – temperature

3

(c) Five max. from:

temperature is compared with preset value

if lower microprocessor switches on heater

if lower microprocessor shuts windows

if higher microprocessor switches heater off

if higher microprocessor switches fan on

if higher microprocessor opens windows

moisture sensor constantly monitors moisture content of soil

humidity is compared with preset value

moisture level is compared with preset value

if lower microprocessor switches on sprinkler

if higher microprocessor switches off sprinkler

light is compared with preset value

if lower microprocessor switches on light bulb

if higher microprocessor switches off light bulb

5

(d) Three explanations from:

Computers are more accurate than human beings

Computers can work continuously without taking a break

Computers do not forget to take readings

Computers can take readings more frequently

Computers can respond quicker to changes than human beings

3

8

three from:

Real thing may be:

Too dangerous

Too expensive

Too large a time scale required

Wasteful of materials

Too vast a scale

3



© UCLES 2007

Question

Number

Answer Part

mark

9 (a) Problem – Headaches

Prevention – Use anti-glare screen/Take regular breaks

Problem – Eyestrain

Prevention – Use anti-glare screen/Take regular breaks

Problem – RSI

Prevention – Use ergonometric keyboard / wrist rests/Take regular breaks

Problem – Backache

Prevention – Use straight backed chair/Take regular breaks

1mark for each problem (2 max)

1 mark for each prevention (2 max)

4

(b) Problem -electrocution

Prevention – RCB installed

Problem – trailing cables

Prevention – create ducts/cover cables with carpets etc.

Problem – heavy equipment falling

Prevention – sturdy tables

Problem – fire

Prevention – extinguisher

1mark for each problem (2 max)

1 mark for each prevention (2 max)

4

10 (a) three descriptions from:

observation

questionnaires

interviews

collecting documents

3

(b) He could find details of a book more quickly

He would save space in his bookshop

1

1

(c) Maximum 5 from:

Title

Author’s name

Reference number/ISBN/Publisher/Picture of cover/ Dewey number/

genre/ fiction or non-fiction/target age group/picture of author/date published/

summary of contents/no. of copies/cost price/selling price/number of pages

Information fills the page AND is clearly a screen form

Appropriate spacing for each field

1

1

2 marks

for 4

items, 1

for 3

items

else 0

1

1

(d) typing in the data twice and comparing them

visually comparing the typed in data with the original

1

1



© UCLES 2007

Question

Number

Answer Part

mark

11 (a) two from:

computer works in digital

phone lines carry sound/analogue signal

need to convert digital to analogue/analogue to digital

2

(b) Two from:

user id/account number

password

memorable name

2

(c) Three from:

Causes data to be scrambled/encoded

Requires an encryption key/software to encrypt

Requires a decryption key/encryption software to decrypt

Results in data which is not understandable/readable

protects sensitive data

from being understood if falls in to the wrong hands.

3

(d) Disadvantages to bank – two from:

Lose older customers who don’t like change

Initial set up costs of equipment/ Initial outlay on computers expensive

Need to employ highly paid technical experts to maintain system

Initial large redundancy payments

Upset/Lose customers due to lack of personal touch

Greater risk of fraud so lose money/description of effects of phishing

Need to retrain staff

2

(e) Disadvantages to customer – two from:

Lack of socialising/ social contacts

Identity theft/misuse of personal data




Easier for customers to mismanage accounts



Cannot deposit/withdraw cash/money


2

(f) three from:

cheques are collected together

during the course of the day

cheques are then processed all at once

cheques are processed overnight

bank accounts updated following morning

3

12 RAM

ROM

ROM

3



© UCLES 2007

Question

Number

Answer Part

mark

13 (a) 4 1

(b) Bar code 1

(c) 5027200190653 1

(d) Producer/food type 1

(e) Check digit

two from:

A single digit

is calculated using the other digits

and added on to the end of the number

recalculated at a later stage to ensure validity of data entry

1

2

(f) Three from:

The bar code field in the data file is read

Record by record

Until a match is found with the bar code entered

The corresponding number in stock is read

One is subtracted from this number

Written back to file.

3

(g) Two from:

PIN is entered

PIN is read from chip

Numbers compared

If identical, transaction is authorised

If not identical transaction refused

2

(h) Four from:

Details from customer’s card read

Bank code allows shop computer to contact bank’s computer

Card details checked for not stolen

Account checked for sufficient funds

If card stolen or insufficient funds then transaction is rejected

If card not stolen and sufficient funds then transaction is authorised

Amount deducted from customer’s bank account

Amount credited to shop’s bank account

Itemised receipt printed out

4

14 (a) webcams/small video cameras

microphones

1

1

(b) three from:

saves travelling time

Do not have to pay for conference room.

Do not have to hire transport.

Conferences can be called at short notice.

Don’t have to carry bulky documents to conference

Disabled students do not have to travel

3



© UCLES 2007

Question

Number

Answer Part

mark

15 (a) (i)

(ii)

the old and the new system run side by side

If the new system breaks down you still have the old system as a backup

It can be a slow process/all tasks have to be performed twice/have to pay two

sets of wages

the new system replaces the old system in one go

saves money in wages/very fast method of implementation

if anything goes wrong you don’t have the old system to fall back on

1

1

1

1

1

1

(b)

Technical – three from:

Program listing

Programming language

Flowchart/algorithm

List of variables

File structure

Purpose of the system/program

Input format or example

Output format or example

Hardware requirements


Sample runs

Known bugs

Validation rules

User – three from:

How to load software/ run software.

How to save a file.

How to search

How to sort

How to print

How to add records

How to delete/edit records

Purpose of the system/program (only if not mentioned in technical

documentation)

Input format or example (only if not mentioned in technical documentation)

Output format or example (only if not mentioned in technical documentation)

Hardware requirements (only if not mentioned in technical documentation)

Software requirements (only if not mentioned in technical documentation)

Sample runs (only if not mentioned in technical documentation)

Error handling

Troubleshooting guide/Contact details/help line/FAQ

3 max

3 max

(c) three from:

comparing the solution with the original task requirements;

identifying any limitations to the system;

identifying any necessary improvements

evaluating the users' responses to using the system

Comparing test results of new system with old system results

Comparing the performance of the new system with performance of the old.

3



© UCLES 2007

Question

Number

Answer Part

mark

16 Six from:

Interactive user screen appears

Questions about geological profile are asked

Answers to questions/geological profile are typed in

Inference engine searches

Searches the Knowledge base

using the Rules (base)

Suggested probabilities of finding oil are output using

Probable depth of likely deposit

Predictions of geological deposits above oil

Detailed Output format

6










demonstrated.


examination.




syllabuses.


IGCSE – October/November 2007 0418 01 Question

Number

Answer Part mark

1

A Touchscreen B Video camera

C Midi interface D Plotter

E Printer

1 each

2 CD ROM drive

Memory stick

1

1

3

CAD a bank worker

MICR an examination paper marker

OMR a shop worker

Touch screen a payroll office worker

Batch processing system an aircraft designer

1

1

1

1

1

4 (a)

1

(b)

1

(c)

1 for

horizontal

line

1 for

correct

verticals

5 Penup

Forward 20

Pendown

Right 90

Forward 100

Right 90

Forward 230

Right 90

Forward 75

Penup

Forward 25

Pendown

Right 90

Forward 80

(Right 90)

1

1

1

1

1

N.B.

Pendown and Right 90

are interchangeable


IGCSE – October/November 2007 0418 01 6 True

False

True

False

False

1

1

1

1

1

7 (a)

(b)

(c)

(d)

A DVD

A floppy disc

A laser printer

A trackerball

1

1

1

1

8 (a)

Three from:

Data capture forms

Report layouts/output format

Validation routines

Queries

Test data/routines

Macro

Specifying hardware and software requirements

3

(b) five max from:

Staff payroll number or equivalent

Personal data (name, address, phone no., fax no., email address, work

phone number, next of kin, date of birth, gender, qualifications, photo etc.)

- 2 marks for 4 items, 1 for 3, else 0

Job description


Information fills the page and is clearly a computer output screen

1

2

1

1

1

(c) Description of abnormal data i.e. data that is outside the range of acceptability

Description of normal data i.e. acceptable data/valid data

Description of extreme data i.e. on the edge of acceptability

1

1

1

(d) Five from:

Gathering data from experts

Designing knowledge base

Creating a knowledge base

Creating a structure to relate each item in the database/knowledge base

Creating an interrogation technique to get at the data

Designing a user interface/method of displaying the results/method of

inputting data/input screen/output screen

Design/create Inference engine

Design/create rule base

Testing the system

5

(e) Two from:

Car fault diagnosis

Mineral/oil prospecting

Tax

Chess games

Plant/animal/rock identification

2


IGCSE – October/November 2007 0418 01 (f) Three from:

Pulse/heart rate

Temperature

Blood pressure

Glucose/sugar level

Rate of respiration

Oxygen level in blood

3

(g) Analogue to digital converter

Sensors measure analogue quantities

Computers work in digital

1

1

1

(h) Three from:

Will not take breaks/can operate continuously (not constantly)

Fewer mistakes/greater accuracy

More than one variable can be measured at any one time

Readings can be taken more frequently

Results are analysed automatically/faster to react/charts are produced

automatically

More reliable/readings taken at regular intervals

Nurses are free to do other tasks

Reduces chance of nurses being exposed to contagious diseases

3

9 (a) C5

1

(b) Any in range A1:A6, B1:B6, C1:G1, B8, E8,F8

1

(c) E2-D2

1

(d) SUM(C2:C6) or C2+C3+C4+C5+C6

1

(e) Copy cell C8

Paste into G8

or

Click on cell G8

Double click on Autosum/click on Autosum and press enter

or

Click on cell C8

Ctrl+move to G8

1

1

or

1

1

or

1

1

(f) Two from:

Designing structures of buildings/architects designs

Flight simulation/car driving simulation

Simulating chemical reactions

Simulating nuclear reactions

Population growth

Queuing

2


IGCSE – October/November 2007 0418 01 10 (a) i) Two from:

Webcams/small video cameras

Microphones

Speakers

Modem

ii) Two from:

Any aspect of connecting equipment together/what each component does

employees are connected on-line/may need to access the Internet/WAN

to work

Images of the employees appear on the screen in real time

Software is needed in each computer to operate the conference

Employees can be heard by all the other employees in the conference

2

2

(b) Two from:

Different time zones make it difficult to have a video conference between

people in different countries

Start up costs can be high/equipment can be expensive to buy

Communication link can go down/reception can be poor

Equipment can fail

Can seem impersonal

Pictures and sound can be out of sync

2

11 Three from:

Internet - INTERnational NETwork

Is a Wide Area Network (WAN)

Can access it from anywhere

Greater amount of information available

Unlimited access

Intranet - INTernal Restricted Access NETwork

Usually a Local Area Network (LAN)

Password controlled pages

Behind a firewall

Can set up specific information pages on Intranet systems

Information within the school is easily accessible by all users

Can limit the places where users can go to study

No wasted time looking through millions of resources

Intranet is better protected for use of emails/from viruses/from hackers

3

12 (a) Two from:

Microwaves

Ovens

Washing machines

Dish washers

Or any reasonable labour saving device

2

(b) Four from:

Increased leisure time/free time/more time to do other things

Increase in social interaction

Can go out whenever they want

Unhealthy diet – TV dinners

Better quality meals – easier to prepare exotic dishes

Part time workers can now work full time

4


IGCSE – October/November 2007 0418 01 13 True

False

False

1

1

1

14 Inputs:

Pressure pads

Light sensors

temperature sensors

Contact switches/push switch

Input keypad

Pass number input to keypad

Zones selected

Sound sensor

Infra red sensor/proximity sensor

Motion sensor/movement sensor

Digital/video camera

3 max

Processing:

Microprocessor continually monitors sensors.

If light sensor detects light beam interrupted:

If movement sensor activated:

If contact switch activated:

If pressure sensed by processor is greater than preset value:

It temperature sensed by processor is greater than preset value:

If sound sensed by processor is greater than preset value:

Microprocessor sends signal to output device.

4 max

Outputs:

Alarm light flashes/lights come on

Alarm sounds

Signal automatically sent to police

3 max

Must have at least one from each section to gain full marks

6 max

15 (a) Three from:

Looking at other people’s data

Changing other people’s data

Deleting other peoples data

Spreading data around

3

(b) Two from:

Use of usernames/ids

Use of passwords

Firewalls

Physical locks of computers/room

Use of biometrics

Special access rights for administrator

2


IGCSE – October/November 2007 0418 01 (c) Two from:

Protects data during transmission phase

Results in data which is not understandable

Is understandable only to authorised users

Need a decryption key/software to decrypt data

2

(d) Five from:

Open/use DTP/word processing package

Create frames/boxes

Take photo using camera

Upload from camera/load from CD ROM/download from Internet/scan

photo

Save the picture

Load magazine document

Import/copy and paste/insert into document

Position the picture/resize picture/editing picture

Type text/import text files

5

(e) Three from:

Sound plus example

Video/animation

Links to other websites

Hot spots

Buttons for navigation/moving around the site

Hit counters

3

(f) Three from:

Website can be hacked into and modified/viruses can be introduced

Can be difficult to read/navigate

Have to have a computer/electricity

Is not portable

Have to have a modem/Internet/router

Can accidentally go to undesirable sites

Cost of maintaining website

Technical knowledge required to maintain website

3

(g) Six from:

Advantages-

Information is up to date

Easier to produce neatly presented work

Internet has vast amounts of information

Speed of search only if referring to use of search engine

Disadvantages-

Danger of accessing doubtful websites.

Can take long time to find required information

Can access biased websites

Can access inaccurate websites

Lack of expertise leads to inefficient searching

Can get easily distracted

+ reasoned conclusion

Must be at least one of each (advantage + disadvantage) to gain full marks

6


IGCSE – October/November 2007 0418 01 16 (a) Four from:

Departure airport typed in

Arrival airport/destination/country typed in

Date of departure typed in

Duration of holiday typed in

Computer database searches for matching departure airport

If match found

Computer database searches for matching arrival airport

If flight on correct date found

Search if seats/tickets available

If so marks seat as booked

Reduces number of seats/tickets available by one

Prints flight details

4

(b) Three from:

Collection of data

Over a period of time

Data is processed all at once

Usually at quiet processor times

Double booking could occur

People would have to wait to see if their booking was made

Cannot change options if no flights available

3

2007

INTERNATIONAL GCSE

MARKING SCHEME

MAXIMUM MARK: 120

SYLLABUS/COMPONENT: 0418/01

Information Technology

SPECIMEN PAPER

Mark Scheme Syllabus Paper CIE IGCSE - Specimen Paper - 2007 0418 1

Question Number

Answer Part mark

1

A Touchpad B Trackerball C Mouse D Keyboard E Bar code reader

1 1 1 1 1

2 False True False False False

1 1 1 1 1

3

three from Windows Icons Menus Pointers

3

4

CD ROM Floppy Disc

1 1

5 Bar code Magnetic stripe Magnetic tape Laser printer

1 1 1 1

6 Right 90 Forward 50 Right 90 Penup Forward 10 Pendown Forward 60 Penup Forward 10 Pendown Forward 30 Right 90 Forward 50 Right 90 Forward 60 5 marks - 1 mark for each group of 3 statements

5

7 (a) 1 RAM two from: Random access memory Volatile memory / lost when power is lost Can be changed / can be written to and read from 2 ROM two from: Read only memory Permanent memory / is not lost when power is lost Cannot be changed / can only be read from

2 2


7(b) one from:

used to hold data currently in use used to hold programs currently in use

1

8(a) two from: can store more data than the memory stick cheaper to replace (not just ‘cheaper’ on its own) not so easy to lose

2

8(b) two from: more compact / easier to carry faster access to data faster data transfer more robust / difficult to damage

2

9(a) Dot matrix printer 1 9(b) Graph plotter 1 9(c) Laser printer 1 10(a) three from:

a network of computers / LAN solely within a company or organization good security for confidential information secure email communication

3

10(b) three from: modulates and demodulates information / converts analogue to digital / digital to analogue Internet connects computers using phone lines phone system is analogue computer is digital therefore conversion is necessary

3

10(c) user name / id password

1 1

10(d) 1 two from: changes data so that it appears to be meaningless needs a decryption key to be understood 2 two from: provides security for sensitive data protects against results of unauthorised access / hacking prevents data from being understood by hackers

2 2

11(a) one from: faxed signed document is legally acceptable can’t be hacked into it can’t be affected by viruses

1

11(b) two from: fax can be seen by anyone in the company / not confidential paper can jam in the fax machine may not be readable when it arrives receiver’s fax line may be continually engaged receiver’s fax may be out of paper receiver’s fax may not be switched on

2

12(a) 7 1 12(b) 5 1 12(c) BFK 297 1 12(d) Size of engine / Price 1 12(e) Text/Alphanumeric 1 12(f) Registration 1


13(a) two from:

unauthorised attempting to gain access to a computer system

2

13(b) two from: a program designed to make a computer system unreliable / crash / delete data copies itself between computers / within one computer

2

13(c) two from: virus checker / virus killer do not open email attachments do not use floppy discs/CDs/DVDs/memory sticks you don’t know the origin of do not download files from the Internet

2

14 real time batch on line real time

1 1 1 1

15(a) three from: observation questionnaires interviews collecting documents

3

15(b) Patient number Personal data (name, address, phone no., fax no., email address, work phone number, next of kin, religion) Medical History with at least 3 lines allowed for completion Information fills the page

1 2 marks for 4 items, 1 for 3 items else 0 1 1

15(c) typing in the data twice and comparing it visual verification

1 1

15(d) three from: field length field/data type validation rules field name record length number of tables (in relational database) file/table names key field relationships/links to other tables

3

15(e) two from: parallel running direct changeover pilot running phased implementation

2


15(f) parallel running/pilot running

two from: there is a backup/fallback system in case of malfunction time can be taken in correcting malfunctions can train staff gradually direct changeover two from: time is not wasted in changeover cheaper as you don’t have to pay two sets of staff system is tested rigorously before implementation less likely to malfunction phased implementation two from: if system malfunctions only small part of business affected don’t have to pay two sets of staff can make sure system works before extending it

2

15(g) two from: to make sure user requirements have been met to identify any shortcomings to identify possible improvements

2

16(a) five from: the payroll number/432175 is read from the transaction file each record is read from the master file the payroll number is compared until the matching record/432175 is found the number of hours/42 is read (from the transaction file) the rate per hour/17.35 is read (from the master file) these are multiplied together the tax rate/27% is read (from the master file) tax is calculated subtracted from the wage name/Jaswinder Dhillon is read (from the master file) workers details printed on payslip

5

16(b) 1 Length check No less than AND no more than 6 characters

1 1

2 Range check Less than 100 AND greater than 0

1 1

16(c) serial access 1

16(d) 1 magnetic disc 2 direct access

1 1

16(e) 1 name/address/phone number changes 2 new worker starts 3 worker leaves/is sacked/dies

1 1 1


17 two from:

pressure pad detects weight of burglar light/infra red sensor detects broken beam contact sensor detects door /window opening temperature sensor detects body heat sound sensor detects any noise made by burglar

one mark for each sensor, one mark for each use. Two sensors maximum 4 max

18 three from: more accurate less dangerous doesn’t forget results/graphs automatically produced

3

19(a) two from: car engine fault diagnosis medical diagnosis chess games

2

19(b) four from: current system is observed potential users interviewed potential users given questionnaires existing documents examined user requirements decided system specification decided knowledge base designed inference engine designed design rule base designing a method of displaying the results hardware chosen knowledge base created inference engine created rule base created

4


20 six from:

Bank Advantages: maximum of two marks from: fewer workers needed - less wages fewer branches needed - less rental workers can be less qualified - lower wages Disadvantages: maximum of two marks from: customer dissatisfaction - lose business initial large expenditure on redundancies initial large expenditure on retraining Customer Advantages: maximum of two marks from: don’t have to spend money on traveling to the bank don’t have to spend time traveling to the bank easier to transfer money from one account to another Disadvantages: maximum of two marks from: hackers could hack into your account loss of personal touch cannot withdraw money

6 max










demonstrated.


examination.






© UCLES 2008

1 A Trackerball (1)

B Web cam (1)

C Magnetic stripe reader (1)

D Joystick (1)

E DVD drive (1) [5]

2 Buzzer (1)

Motor (1) [2]

3 F (1)

T (1)

F (1)

T (1)

F (1) [5]

4 (a) a keyboard (1)

(b) a school register (1)

(c) a floppy disc (1)

(d) a graph plotter (1) [4]

5 Three from:

Giving software copies to others without the owner’s permission

Making a copy of a disk without the owner’s permission

Selling copies of the software without the owner’s permission

Using the software on a network when the licence does not allow it

Renting out the software on a network when the licence does not allow it

Renting out the software/sharing software with others without the permission of the owner

Using the copyright name on other software

Amending software/using parts of code in own programs without permission

Buying pirated software [3]



© UCLES 2008

6 Penup

Forward 20

Right 90 Right 90 and Pendown interchangeable

Pendown

Forward 75

Right 90

Forward 80

Penup

Forward 85

Pendown

Forward 55

Right 90

Forward 50

Penup

Forward 25

Pendown Pendown and Right 90 interchangeable

Right 90

Forward 75

1 mark for each group of 3/4 statements [5]

7 (a) Three from:

ROM cannot be changed/permanent/RAM is temporary memory


RAM is volatile/ROM is non-volatile

ROM is read only memory and RAM is random access memory [3]

(b) ROM stores BIOS/program cycles in a washing machine/program instructions in games (1)

RAM holds the data currently being used by the user (1) [2]

8 Problem – electrocution

Prevention – RCB installed/cable insulation

Problem – trailing cables

Prevention – create ducts/cover cables with carpets/description of how length of cabling could be

reduced e.g. WiFi

Problem – heavy equipment falling

Prevention – large/sturdy tables

Problem – fire

Prevention – appropriate type of extinguisher/regular maintenance of equipment/ventilation

1 mark for each problem (2 max)

1 mark for each prevention (2 max) [4]



© UCLES 2008

9 (a) Destination/country/resort name (1)

Features such as:

Hotel name/name of campsite/length of stay/Resort features/type of room/star rating/name of

nearest airport to resort/name of departure airport(s)/length of flight/places of interest to visit/

type of holiday/dates of availability/reference number of holiday/price of holiday/picture of

resort or hotel

(3 marks for 5 items, 2 for 4 items, 1 for 3 items, else 0)

Information fills the page AND is clearly a screen form (1) [5]

(b) Two from:

Data is entered twice

Data versions are compared by computer

If versions are different, typist is alerted (2)

Two from:

Data on screen/in system

Is visually compared with

that on data capture form (2) [4]

(c) Three from:

Validation is checking data entered

Is acceptable/reasonable/within a given range

Verification is checking versions of data have been entered identically/is checking data has

been copied correctly

From one medium to another (3)

Two from:

Range check

Check digit

Control total

Hash total

Invalid character check/type check

Picture/format check/input mask

Presence check

Existency check

Length check (2) [5]



© UCLES 2008

(d) Six from:

Parallel running/implementation

Information is not lost/always a second copy

Have to pay two sets of workers

Phased implementation

Still have most of system if things go wrong

No expense of running two systems together

Lose some data if things go wrong

Direct implementation/changeover

Time is not lost

Do not have expense of running two systems together

If things go wrong lose all data

Pilot running

Pilot/phased/parallel are slow methods of implementation (6) +1 for reasoned conclusion [7]

(e) Technical:

Purpose – (help programmers/analysts) make improvements to system/repair system/

maintain system (1) Two from:

Program listing

Flowchart/algorithm

List of variables

File structure

Purpose of the system

Purpose of the program

Screen layouts

Print formats



Sample runs

Known bugs

Error messages

Validation routines (2) User:

Purpose – help users to learn how to use system (1) Two from:

How to load software/run software

How to save a file

How to search

How to sort

How to print

How to add records


Troubleshooting guide

Screen layouts (only if not mentioned in technical documentation)

Error messages (only if not mentioned in technical documentation)

Print formats (only if not mentioned in technical documentation)




Tutorials (2) [6]



© UCLES 2008

10 Three from:

Increased unemployment

Increased employment (with reasons)

Have had to retrain

Less noise/more pleasant environment

Safer environment

Less heavy lifting/healthier work

Workers can be deskilled [3]

11 (a) Four from:

Doctors interviewed for requirements

Data is collected from experts

Knowledge base is designed/created

Rule base is designed/created

Inference engine is designed/created

Input Screen is designed/created

Output format is designed/created (4)

Ailments with known diagnoses are used to test the system and results evaluated/does new

system match original system specification/interviewing doctors about effectiveness of

system (1) [5]

(b) Two from:

(Car engine) fault diagnosis

Prospecting

Tax

Careers

Chess games

Animal/plant classification [2]

12 (a) Three from:

Temperature

Pressure

Moisture

Humidity

Light

Motion [3]

(b) Sensor measures analogue data (1)

Computer works with digital data (1) [2]

(c) Three from:

Computer can take readings during holidays/readings can be taken any time of day or

night/24/7/do not take breaks

Computer readings are more accurate

Readings can be taken more frequently

Can produce graphs/results more quickly

Computer doesn’t forget to take readings [3]



© UCLES 2008

(d) Five from:

Save spreadsheet in suitable format

Create graphs

Load/open word processing software

Insert spreadsheet/import spreadsheet/copy and paste spreadsheet/embed spreadsheet into

document

Insert/copy and paste graphs

Type in/insert text

Insert/import images

Format images/charts

Format reports/text [5]

13 Producing utility bills (1)

Inputting details of new stock into a library’s database (1)

Reading data from bank cheques (1) [3]

14 (a) (i) Ring (1)

(ii) Star (1) [2]

(b) Advantages

Two from:

Share hardware

Share software

Share data/information

(Electronic) communication

Users can be more effectively controlled/monitored (2)

Disadvantages

Two from:

Work can be misused more easily

Viruses more easily spread

Printer queues

Slower access to Internet

If server crashes all computers are affected

Increased security risk (2) [4]

15 (a) 5 [1]

(b) 4 [1]

(c) 0027200190653 5 [1]

(d) Number in stock [1]

(e) Text/alphanumeric [1]



© UCLES 2008

(f) Bar code [1]

(g) Four from:

Bar code is entered

The bar code field in the data file is read

Record by record

Until a match is found with the bar code entered

The corresponding number in stock is read

One is subtracted from this number

Written back to file

No. in stock checked with re-order quantity

If < = re-order quantity

then re-ordered/flagged [4]

(h) Five from:

Card details checked for validity

PIN is entered

PIN is read from chip

Numbers compared

If identical transaction is authorised

If not identical transaction refused

Customer bank contacted by computer/automatically

Check if enough funds in account

If card invalid/insufficient funds then transaction is rejected

If card valid and sufficient funds then transaction is authorised

Money deducted from customer account

Money credited to supermarket account [5]

(i) Two from:

User name/account number

Password/PIN [2]

(j) Two from:

Key needed to encrypt

Data is jumbled up/encoded

Key must be known to decrypt it

Prevents people from understanding data [3]



© UCLES 2008

(k) Eight from:

Customer – advantages


Don’t have to waste time travelling (long distances to shops)

Elderly/Disabled people don’t have to travel to shop/leave home

Don’t have to spend money on travelling expenses travelling (long distances to shops)

Greater choice of goods

Can shop when shops are closed

Easier to search and find what you’re looking for

Customer – disadvantages

Lack of socialising/social contacts






Cannot see/feel goods in reality


Goods sometimes don’t arrive/substitute goods may be sent/take longer to arrive

Must have a credit card

Shipping charges

Shop – advantages

Fewer staff needed/less spent on wages

Fewer shops needed/less spent on rates/rent

Less actual cash handled/fewer robberies

Less money spent on security staff

Potentially larger customer base

Shop – disadvantages

Initial outlay on computers is expensive

Need to retrain staff

Less customer loyalty/loss of customers due to lack of personal touch

Costs of system maintenance

Greater costs due to more delivery staff [8]

Full marks can only be awarded if at least 1 mark from each section is achieved.

Max 5 from any one section.










demonstrated.


examination.




syllabuses.


IGCSE – October/November 2008 0418 01

© UCLES 2008

Question

Number

Answer Part

mark

1

A Desktop computer

B Laser printer

C Pin pad

D Microphone

E Laptop computer

[1]

[1]

[1]

[1]

[1]

2

CD ROM DVD ROM DVD R

Floppy disc Hard disc Memory Stick

[1] [1]

3

F

T

T

F

T

[1]

[1]

[1]

[1]

[1]

4

Dot Matrix printer high quality high volume output

Laser printer high quality low volume output

Inkjet printer multimedia presentation

Monitor high quality very large printouts

Graph plotter continuous stationery

[1]

[1]

[1]

[1]

[1]

5 (a) Magnetic tape [1]

(b) Chip [1]

(c) DVD ROM [1]

(d) Bar code [1]

6 Right 90

Forward 70

Right 90

Forward 60

Penup

Forward 80

Pendown

Forward 85

Penup

Right 90 these two are interchangeable

Forward 50

Pendown

Forward 20

Right 90

Forward 100

1 mark for each group of 3 statements

[5]



© UCLES 2008

7

(a) (b) (c)

1 mark

each

[total 3]

8 Two from:

Faster to arrive/to be delivered

Cheaper must be qualified (e.g. paying for a phone call is cheaper than buying a

stamp/cheaper than paying transport costs)

You don’t have to leave your house to send e-mail.

Email can be accessed/read from any location

Replies to e-mails can be quicker.

Easier (cheaper, quicker) to send same message to many people

[2]

9 (a) Interview shop assistants / customers / Hussain / OR face-to-face question session

Can change script to suit circumstances / questions can be explained / repeated /

interviewer can interpret body language

Observing shop assistants / customers / Hussain / OR watching over the whole

process

Can gain broader overview of processes / saves workers’ time / can gain a more

accurate view of what is happening

Examining documents used in current system

Can follow data flow more easily / informs input / output format design

Distributing questionnaires to shop assistants / customers / Hussain / OR using

written questions to gather responses

Better for busy people / don’t have to prearrange appointments / more honest as

they are anonymous / takes less time to get all the results (compared with e.g.

interview)

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

(b) Title

Author’s name

Reference / Accession number / ISBN / Bar code number / Publisher / Picture of

cover / Dewey number / genre / category / fiction or non-fiction / target age group /

picture of author / date published / place published / summary of contents / critique / no. of copies / price / edition / number of pages / hardback or paperback / language

Information fills the page AND is clearly a screen form

Appropriate sizing for each field

[1]

[1]

2 marks

for 4

items, 1

mark for

3 items

else 0

[1]

[1]

[max. 5]

(c) Three from:

Field name

Field Type

Field Length

Key Field

Validation Check

Index

Input mask

[3]



© UCLES 2008

(d) Normal data

Data which is acceptable / within the given range / accept example

Abnormal data

Data of the wrong type / outside the given range / accept example

Extreme data

Data at either end of the range allowed / accept example

[1]

[1]

[1]

[1]

[1]

[1]

(e) Three matched pairs from:

Parallel running / implementation

Have to pay two sets of workers / takes a long time before system is (fully)

implemented/individual transactions take longer

Direct changeover

If unsuccessful lose all the data / no backup

Pilot running

If unsuccessful lose some data / takes a long time before system is (fully)

implemented


If unsuccessful lose some data / takes a long time before system is (fully)

implemented

[6]

(f) Three from:

The ease of use (of the solution)

The appropriateness of the solution

Compare the solution with the original task requirements / old system / design /

objectives of system / users needs

(Identify any) limitations

(Identify any) improvements which can be made to the system

Evaluating the users' responses (to the results of testing the system)

[3]

(g) Three from:

RSI – wrists

RSI – fingers

Headaches

Back problems / neck pain

Sight problems / eye strain / dry eyes

[3]

10 Three from:

Are input devices

Card inserted into card reader / chip reader

Used with bank cards / credit cards

Used at ATMs or EFTPOS systems

PIN is typed in (using PIN PAD)

Details on chip are read by chip reader

PIN entered is compared with PIN on chip

[3]

11 On-line

Batch

On-line

Batch

[1]

[1]

[1]

[1]

12 (a) E2 [1]

(b) Any cell in range A1:A6 OR A1:E1 [1]

(c) = C2-B2 [1]



© UCLES 2008

(d) Copy D2

Highlight D3:D6

Click paste

OR

Select / Go to / Click / Highlight D2 / drag from D2

Using fill handle / little black square / cross in bottom right hand corner of cell

Drag down to D6

OR

Select / Go to / Click / Highlight D2 / drag from D2

Drag down to D6

Fill down

1 for

each

line

[3 max]

(e) 6 [1]

(f) Two from:

Named simulation e.g. car driving simulation

Flight simulation / pilot training

Mathematical models

Scientific models

Civil engineering models / buildings / engineering / architectural

Weather model

Supermarket queues

Chemical reactions

Nuclear reactions

Economic models

Space exploration model

Car crash model

[2]

(g) Two from:

Some situations are / real thing might be dangerous / it (model) is less dangerous

Cost of building real thing / materials

It may take a long time to obtain results from the real thing

Easier to modify

[2]

13 Six from:

Input – answers typed in / symptoms are typed in

Processing –

Expert system compares symptoms

Compares symptoms with those in the knowledge base

Compares symptoms using inference engine

Compares symptoms using rules base

Matches of symptoms are found

Output –

Questions asked by system

Suggested / possible diagnoses

[6]

14 (a) Three from:

Humidity

Moisture

Temperature

pH

Light

[3]

(b) Sensors produce analogue data / signal

Computers work in digital

[1]

[1]

(c) Analogue to digital converter / ADC [1]



© UCLES 2008

(d) Two from:

(Computer readings are) more accurate / precise

Readings can be taken more frequently.

Readings can be taken any time of day or night / operates 24/7 / no breaks

needed

Can produce graphs more quickly

More reliable / readings taken at regular intervals / computers don’t forget to take

readings

[2]

15 (a) Three from:

Several people can take part in a conference regardless of where they are

People are connected online / using internet

Images of the members of conference appear on the screen

Software is needed in each computer to operate the conference

Codec is needed

People who speak can be heard/seen by all the other people in the conference

1 mark for relevant hardware (at least two items)

[3]

(b) Two from:

Do not have to pay for conference room / less expensive than hiring larger

accommodation

Time is not wasted in travelling to a venue

Do not have to pay employee travelling expenses

Do not have to pay for hotel rooms / overnight stays

Conferences can be called at short notice

Can ensure safety of employees

[2]

16 Technical

Technical

Technical

User

[1]

[1]

[1]

[1]

17 DTP three from:

Advantages

Disabled people / elderly people do not have to go to the library

It can be printed in Braille

You can read it at a time which suits you Disadvantages

Need for physical distribution

No sound

No animation

No video

Printing costs/paper and ink costs Presentation three from:

Advantages

Sound

Animation

Video

Interactive / hyperlinks Disadvantages

Library will need to have screen / computer / appropriate software

Not everyone will visit the library / takes time to go to the library / costs money to

travel to the library / may not get information to every household / may not be seen

by everyone Must have at least one disadvantage and one advantage to get full marks

There is a mark available for a reasoned conclusion

[6]



© UCLES 2008

18 Eight from:

Advantages


Saves time rather than queuing

Don’t have to waste time travelling to shops / banks / theatres etc.

Disabled people don’t have to travel / leave home

Don’t have to spend money on travelling expenses (travelling long distances

to shops / banks / theatres)

Greater choice of goods / seats

Can shop when shops / bank are closed / can book tickets when theatres are

closed / can shop / bank / book 24/7

Less traffic pollution

Disadvantages

Lack of socialising / social contacts

Customers must have a computer / (basic) computer skills

Hackers may intercept data / defraud customer




Cannot see / feel goods in reality


Lack of exercise

May not get the exact goods they ordered

A mark is available for a reasoned conclusion

Max 5 from either advantages or disadvantages

[8]



for the guidance of teachers

0417 INFORMATION AND COMMUNICATION

TECHNOLOGY




indicate the details of the discussions that took place at an Examiners’ meeting before marking began,

which would have considered the acceptability of alternative answers.


examination.




Mark Scheme: Teachers’ version Syllabus Paper


© UCLES 2009

1 A Magnetic stripe (1)

B Magnetic ink characters (1)

C Chip (1)

D Optical marks (1)

E Bar code (1) [5]

2 Graphics tablet (1)

Touch screen (1) [2]

3 F (1)

F (1)

T (1)

T (1)

F (1) [5]

4 Desk top publishing ! producing a school magazine (1)

Measuring program ! monitoring temperature in a science experiment (1)

Spreadsheet ! managing personal finance (1)

Inference engine ! suggesting medical diagnoses (1)

Database ! storing pupil records in a school (1) [5]

5 (a) Numeric (Integer) (1)

(b) Alphanumeric (1)

(c) Boolean (1)

(d) Date (1) [4]

6 Forward 80

Right 90

Forward 180

Right 90

Forward 70

Penup

Forward 10

Pendown Pendown and Right 90 are interchangeable

Right 90

Forward 80

(Left 90)

1 mark for each pair of statements [5]



© UCLES 2009

7 (a) Hybrid/tree (1) [1]

(b) Star (1)

Bus (1) [2]

(c) (i) A hub (1)

(ii) A switch (1)

(iii) A proxy server (1)

(iv) A bridge (1) [4]

8 F (1)

T (1)

T (1)

F (1) [4]

9 Real Time (1)

Batch (1)

Real Time (1)

Batch (1) [4]

10 (a) 1 [1]

(b) A4 [1]

(c) Any cell in the range B2 to F5 [1]

(d) (=) D2*E2 [1]

(e) Fill down (1)! Copy and paste (1)! Dragging the fill handle down (1) [3]



© UCLES 2009

11 (a) Questionnaires (1)

Interviews (1)

Examination of documents (1)

Observation (1) [4]

(b) To detect typing errors/data entry errors/transcription errors [1]

(c) Either:

Visual verification (1)

Typed in data is visually compared with original data (1)

Or

Double entry (1)

Date is typed in twice and computer compares the two versions (1) [2 max]

(d) Four from:

Name

Title/gender

Customer number/id

Address

Post code

(Work/Mobile) phone number

(Home/Mobile) phone number

Email address

Car registration number(s) [4]

(e) Four from:

Button to close form

Button to first record/form

Button to end of file/new record

Button to previous record/form

Button to next record/form

Submit/continue button

Space to enter required record number

Search facility/engine

Button to go to sub forms [4]

(f) Field names (1)

Validation routines (1)

Field Lengths (1) [3]

(g) Three from:

Parallel running

Pilot running


Direct changeover [3]

(h) The appropriateness of the solution (1)

Comparing the solution with the original task requirements (1)

Any improvements which can be made to the system (1) [3]



© UCLES 2009

12 (a) Two from:

Flight/pilot simulation/training

Large scale chemical experiments

Design of fairground rides

Design of large buildings/bridges

Traffic control

Building fire simulation

Car driving simulation

Drug trials [2]

(b) Three from:

Real thing may be too expensive to build

Real thing requires too large a time scale

Real thing would be too wasteful of materials

Real thing is too vast a scale

Real thing may occur too rarely

Rate of change can be adjusted for human eye to detect

Corrections can be made if mistakes in real thing/amendments are easier in a model [3]

13 Inference engine (1)

Interactive input screen (1)

Knowledge base (1)

Rules base (1) [4]

14 (a) RSI (1)

Headaches (1) [2]

(b) Take regular breaks (1)

Put a screen filter in front of the monitor (1) [2]

(c) Electrocution (1)

Fire (1) [2]

(d) Don’t overload electrical sockets (1)

Make sure there are no bare wires (1) [2]

15 Three from:

Keyboard/typing in data

A bar code (reader)

A magnetic stripe (reader)

Touch screen

Three from:

Scanning bar codes/swiping magnetic stripes/touch screen gives fast data entry/keying in data

can be slow

Scanning bar codes/swiping magnetic stripes/touch screen reduces errors/keying in data can

lead to data errors

Keyboards/touch screens are robust/bar codes can be flimsy

Magnetic stripes are more robust than bar codes [6]



© UCLES 2009

16 (a) Three from:

Reduced cost of wage bill

Computer readings are more accurate/human errors are reduced

Readings can be taken more frequently/continuously

Nurses can get tired and forget to take readings

Nurses are so busy they might not be able to take readings regularly

Nurses won’t be exposed to contagious diseases

Automatic warnings can be generated

Graphs can be produced automatically

Nurses can be freed up to do other tasks [3]

(b) Four from:

Sensors are used (to generate data)

Data are then sent to computer

Sensors read analogue data

Computers work with digital data only

Data needs to be converted so computers can process/understand data [4]

17 Six from:

Advantages

Workers can use own office so documents do not get lost in transit/bulky documents/equipment

do not have to be carried around

Company can call meeting at short notice

Employees can work from home

Company does not have to pay travelling expenses

Company does not have to pay hotel expenses

Company does not have to pay for conference room facilities

Travelling time is saved

Might be dangerous to fly/travel

Disabled people may find it difficult to travel

Disadvantages

Takes time to train employees

Difficult to call international meetings because of time differences

Initial cost of hardware

Equipment can break down

Strength of signal/bandwith/lipsync can be a problem/connection can be lost/power cuts

Loss of personal/social contact

Takes time for workers to learn new technology

Can’t sign documents

Max. 4 advantages/disadvantages

One mark available for reasoned conclusion [6]



© UCLES 2009

18 Four from:

Data more difficult to copy

Extra layer of security with PIN number

Even if stolen card cannot be used unless thief knows PIN number

Larger amount of information can be stored

Disabled people find it easier than signing

Reduces disputes at checkouts over validity of signature/

Saves time at checkouts

Not affected by magnetic fields [4]

19 Eight from:

Fax

Advantages

Can be used as a legal document

Documents can be very long

Disadvantages

Cannot be certain if correct person has received it

Very slow transmission rates

Not very good quality

Documents cannot be edited easily

Cannot send multimedia files

Won’t be received if line is busy/receiving fax machine switched off/out of paper

Wastes/expense of ink/paper

Email

Advantages

Can be confident message will only go to the correct person (if addressed correctly)

Fast transmission times

Attachments can be downloaded and edited

Easier to send large documents

Disadvantages

Can be slow turnaround times

Some systems have limits to size of attachments

Addresses more difficult to remember than phone numbers

Description of how phishing can occur

Description of how viruses can be transmitted

Bulletin boards

Advantages

You don’t need an ISP

Messages can be moderated

Automatically creates an archive

Disadvantages

Lack of privacy (every member of the group can see every message)

In older systems only one person can be online at one time

Doesn’t alert you to incoming messages

One mark available for reasoned conclusion [8]











examination.




syllabuses.



Question

Number Answer

Part

mark

1

A Scanner

B Dot matrix printer

C Hard disc drive

D Graphics tablet

E Multimedia projector

[1]

[1]

[1]

[1]

[1]

2

Bar code reader Keyboard Laser printer

Memory Stick Mouse Zip disc drive

[1] [1]

3

True False

Dot matrix printers produce high quality output ! [1]

Laser printers are very noisy ! [1]

Graph plotters are used when extremely large hard

copy is required ! [1]

Inkjet printers are used where continuous stationery

is required !

[1]

4 (a)

(b)

(c)

(d)

A mouse

A bank cheque

A memory stick

A microphone

[1]

[1]

[1]

[1]

5

True False

RAM is not volatile ! [1]

ROM is used to store the BIOS of a computer ! [1]

The data in ROM is easier to change than that in

RAM ! [1]

RAM is used to store the data the user is currently

working on ! [1]

6 Triangle:

1 mark for a correct loop e.g. REPEAT 3, END REPEAT

1 mark for RIGHT 120

Backward sequence

1 mark for PENUP, BACKWARD 80, PENDOWN

Square:

1 mark for a correct loop e.g. REPEAT 4, END REPEAT

1 mark for FORWARD 100 coming immediately after RIGHT 90 as given

[5]



7

Health Safety

Headaches caused by prolonged use !

[1]

Trailing wires in a computer room !

[1]

RSI though continual typing !

[1]

Back problems through bad posture !

[1]

Too many plugs in an electric socket !

[1]

Drinking water whilst using a computer !

[1]

8

Producing utility bills

Paying for goods at an EFTPOS terminal ! [1]

Making an airline booking ! [1]

Producing monthly payrolls

Monitoring a patient’s condition in a hospital ! [1]

Reading data from bank cheques

9 (a) Four from

ID number/Borrower number

Photo of borrower

Name

Address

Post code

Email address

Gender/Title

Date of Birth

Max. two from:

Home Phone number

Work Phone number

Mobile Phone number

[4]



(b) Four from:

Data fills the screen

Clearly defined input area for each record


Back button/arrow/previous record facility

Forward button/arrow/next record facility

Number of record is on screen

Submit button/facility

First record button/facility

Last record button/facility

An easy to read font/font size/

A sensible font colour/background colour

Easy to follow instructions for completing screen/help icon

No overlapping of items

Exit button/return to homepage button/facility

[4]

(c) Double entry/data entered twice

computer compares the two versions

Visual checking/verification

Typed in data is compared with original data

[1]

[1]

[1]

[1]

(d) Three from

Normal data is data which is within an acceptable range/ is usual for the situation

Any example between 1 and 6

Extreme data is data which is at either end of a normal range of data

Examples: 1, 6

Abnormal data is data which is outside the acceptable range/is of the wrong

data type

Example: any negative number or number greater than 6 or text example

[1]

[1]

[1]

[1]

[1]

[1]

(e)

Improvements can be made ! [1]

The hardware and software can be specified

Limitations of the system can be identified ! [1]

To see how many books are required

To make sure the user is satisfied with the system ! [1]

So that program coding can be written



(f) Technical

Three from:

Program listing

Programming language

Flowchart/algorithm

List of variables

File structure

Purpose of the system/program

Input format or example

Output format or example



Sample runs/test runs

Known bugs/possible errors

Validation rules

User

Three from:

How to load software/run software/install software.

How to save a file.

How to search

How to sort

How to print

How to add records


Purpose of the system/program (only if not mentioned in technical documentation)

Input format or example (only if not mentioned in technical documentation)

Output format or example (only if not mentioned in technical documentation)




Error messages (only if not mentioned in technical documentation)

Error handling

Tutorials

Troubleshooting guide/Contact details/help line/FAQ

[3 max]

[3 max]

10

The customer types in the PIN 3 [1]

If the PIN and the number stored in the chip are the same go onto the

next step 5

[1]

The customer’s account is checked to see if it has sufficient funds 7 [1]

The card is inserted into the reader 1

The PIN number is compared with that stored in the chip 4 [1]

The transaction is authorized 8 [1]

The device checks if the card is valid 2 [1]

The supermarket computer contacts the customer’s bank computer 6 [1]

[Total: 7]



11 (a) Six from:

Interactive user screen appears

Details of car type are entered

Questions about engine problems are asked/on-board computer connected to

expert system

Answers to questions/engine problems are typed in

Inference engine searches

Searches the Knowledge base

using the Rules (base)

Suggested probabilities of faults are output

In the form of a report to the mechanic/on screen output

[6]

(b) Two from:

Medical diagnosis

Mineral prospecting

Chess games

Plant identification

Animal identification

Tax advice

Careers advice/guidance

Insurance

Drug efficacy

[2]

12 (a)

Pressure sensor ! [1]

Proximity sensor

Temperature sensor ! [1]

Oxygen sensor

(b) Computers work in digital

Sensors produce analogue data

[1]

[1]

(c) Five from:

Microprocessor continually monitors sensors

Data is converted from analogue to digital/ADC is used

Compares water level with pre-programmed value

If water level reached microprocessor switches off valve

Else valve left on/switched on

Compares temperature with pre-programmed value

If temperature higher microprocessor switches off heater

Else heater left on/switched on

Compares weight of clothes with pre-programmed value

If clothes too heavy microprocessor sounds alarm/stops machine/motor stops

running

Else cycle continues/motor starts

[5]



(d) Four from:

Microprocessor controlled devices do much of housework

Do not need to do many things manually

Do not need to be in the house when food is cooking

Do not need to be in the house when clothes are being washed

Can leave their home to go shopping/work at any time of the day

Greater social interaction/more family time

More time to go out/more leisure time/more time to do other things/work

Are able to do other leisure activities when convenient to them

Can lead to unhealthy eating due to dependency on ready meals

Can lead to laziness/lack of fitness

Can encourage a healthy lifestyle because of smart fridges analyzing food

constituents

[4]

13 (a) Two from:

Modem

Router

Or any other suitable answer

[2]

(b) Five from:

WAN is a wide area network

WAN covers a large geographical area/worldwide

The Internet is a WAN

LAN is a Local Area Network

LAN covers a small area such as one building/A school network is a LAN

A WAN consists of connected LANs

More difficult to share peripherals using a WAN

[5]

14 (a) 4 [1]

(b) 5 [1]

(c) Product type [1]

(d) Mupe [1]

(e) Bar code [1]

(f) Range check

Two from:

Values less than 0 (or ‘lower limit’) or more than an upper limit

Will be rejected/not allowed/must be within

A correct example can be awarded both marks

[1]

[2]

15

Graph plotter

Trackerball

Microphone ! [1]

Speakers ! [1]

Optical mark reader

Web cam ! [1]



16 Three from

User ID/Passwords/PIN

User ID/Password/PIN entered is compared with that held on system/never

tell anyone your password/regularly change password/make it not easy to

guess/only person who knows password can access account

Encryption

Data is scrambled up/key must be known to unscramble it/prevents people

from understanding data

Firewall

Prevents unauthorised users/computers from accessing network

Digital certificates

Transactions are digitally signed/authenticated/transaction is linked to the PC

being used to carry out online banking

Anti Spyware

Prevents spyware from invading your computer and gaining personal information

Make sure website is secure

Locked padlock is present on display

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[1]

[Total: 6 max]

17 Eight from:

Drawbacks:

Not all information is accurate

Some information is purely for advertising/selling purposes

Might need proxy server to prevent access to certain types of site

Some information is pornographic

Anyone can put information on the Internet

Much of the information on the Internet is not filtered

Need to identify the validity of the author

Need to be careful about whether information is fact or opinion

Information can be biased

Results from search engine could be skewed because of

sponsorship/marketing

Internet is not policed

So much information available which might be unreliable

Benefits:

Wide range of information to select (desirable/reliable information)

Able to search quickly (using search engines) to find (reliable/desirable)

information

Information can be downloaded and edited (to make it desirable/reliable)

Can use the final part of a URL to identify reliability

Information can be up to date/real time so reliable

.ac, .gov, .org are usually fairly reliable

Can compare information from sites to see if it is reliable

[8]




0417 INFORMATION AND COMMUNICATION

TECHNOLOGY







examination.






© UCLES 2010

Ques.

No.

Answer Part

mark

1

A DVD RAM B Pen drive

C Magnetic tape D Magnetic disc

1, 1

1, 1

2

Blu ray disc Graph plotter Graphics tablet

Optical mark reader Projector Web cam

1

1

3

TRUE FALSE

Input devices are examples of hardware. !

Backing storage devices are examples of software. !

A Graphic User Interface is a part of an operating system. !

A laptop computer cannot be carried around. !

1

1

1

1

4

Remote Control to input freehand drawings into a computer

Keyboard operating a television

Touch screen entering text when writing a book

Chip reader selecting options in a tourist information kiosk

Graphics tablet reading information from a credit card

1

1

1

1

1

5 (a)

(b)

(c)

(d)

a hub is a device used to connect computers together to form a LAN

an Intranet is a network with restricted access

a Proxy server can allow networked computers to connect to the internet

a WLAN is a wireless local area network

1

1

1

1

6 Three from:

Pen drives have greater storage capacity

Pen drives are more portable

Not all machines have CD drives

Faster access to data

More robust

More secure as biometric data can be incorporated

Don’t need specialist hardware/software for pen drives

3



© UCLES 2010

7 PENUP

FORWARD 70

PENDOWN

FORWARD 60

PENUP

FORWARD 80

RIGHT 90/PENDOWN

PENDOWN/RIGHT 90

FORWARD 80

RIGHT 90

FORWARD 100

1 mark for each 2/3 statements

5

8

Web logs !

Databases

Models

Wikis !

DTP

Social networking sites !

1

1

1

9

TRUE FALSE

Withdrawing money from an ATM !

Producing utility bills !

Booking a plane ticket !

Producing payslips !

1

1

1

1



© UCLES 2010

10 (a) Three from:

Humidity

Moisture

Temperature

Light

pH

CO2

3

(b) Sensors feed back analogue data

Computers can only work with digital/binary data/cannot read analogue

1

1

(c)

Computer readings are more accurate. !

Students always forget to take readings

Students might be unavailable to take readings during school holidays. !

Computers can record data for later use.

Computers can analyse the results.

Computers can react to changes in the conditions immediately. !

1

1

1

(d) Two from:

Earth/chemical particles will not affect its performance.

It can operate without needing to refill the paper as regularly/can work on

continuous paper.

Running costs are low.

2

(e) Two from:

It will be cheaper to buy.

Print outs will be clearer.

It is more compact.

2

11 (a) 4 1

(b) 5 1

(c) Relational database 1

(d) Two from:

Data does not have to be typed in twice/referential integrity.

Quicker to enter new data.

So fewer errors are likely.

So less memory/storage capacity is used.

So it is easier to edit data.

2

(e) Code 1

(f) Book Borrowed 1

(g) Cost 1

(h) Date 1

(i) Range check 1

(j) Format/picture/input mask 1



© UCLES 2010

12 A router – so that data can be transferred from one network to another

A browser – to access the (world wide) web /view web pages/surf the net

Email – so that he can send messages to people outside the network/home

An ISP – in order that he can access the internet/email/to provide internet service

1

1

1

1

13 (a)

Data encryption techniques are easy to crack.

Data can be accessed without being in the building where it is stored. !

Data thieves do not leave physical signs of robbery. !

Data passwords are easy to guess.

1

1

(b)

Make backups of the data.

Users should write down their password in case they forget it.

Have a firewall connected to the network. !

Have different levels of access to the data. !

1

1

14 (a)

True

(!)

False

(!)

Examining documents has to be done in the presence of all the

workers. !

Appointments have to made with a worker in order to complete

a questionnaire. !

It is possible to change questions in the course of an interview. !

Observing the current system can provide a detailed view of

the workings of the system. !

1

1 1 1

(b)

Inputs to the current system

User and information requirements

Data capture forms !

Validation routines !

Problems with the current system

File structure !

Report layouts !

Limitations of the system

1

1

1

1



© UCLES 2010

15 Direct changeover – One from:

It is the quickest method of implementation/the benefits are available immediately

Do not have the expense of running two systems

Parallel running

There is always the old system to fall back on in the event of the new system failing

Phased implementation – One from:

Still have rest of old system if new system fails

Training can be gradual

Enables refinement of each phase of the system before fully implementing

3

16 Two strategies and two reasons from:

Strategy – compare the solution with the original task requirements/design brief

Reason – to ensure that requirements have been met

Strategy – identify any limitations/necessary improvements to the system

Reason – so that system works without problems

Strategy – Collect data from the users of the new system

Reason – to see how well they are coping with the new system/ to see how well the

new system works

Strategy – analyse (evaluate) the users’ responses to the results of testing/using

the system

Reason – so that users needs are taken into account

4

(2 + 2)

17 Three from:

Web cam/video camera to input/capture video (images of participants/documents)

router/modem to transmit data to participants’ (computers)

Microphone to input voices of participants/to speak to other participants

Headphones/speakers to output voices to participants/hear other participants

Large screen/projector to see other participants

3

18

The number in stock of the matching record is read 4

Until a match is found with the entered bar code 3

The bar code field in the data file is read record by record 2

The bar code on the product is read by the bar code reader 1

The new value of number in stock is written back to the file 8

If it is equal to the re-order number then more goods are automatically re-

ordered 7

One is subtracted from the number in stock 5

The number in stock is compared with the re-order number 6

1

1

1

1

1

1

1



© UCLES 2010

19 Three from:

If the airplane crashed you wouldn’t need to replace it – saving money

If the airplane crashed nobody is injured

It is easy to recreate extreme weather conditions

It is easy to create unusual flying conditions

Can recreate mechanical/computer failure from previous real situations

Cheaper fuel costs

3

20 Phishing

One from:

is using e-mails pretending to be the target's bank

Fake email to get personal details

Pharming

One from:

is installing malicious code on a pc or server to redirect to fake websites

redirecting users to websites which look authentic to get personal details

Spam (is the sending/receiving of) unsolicited/junk emails

1

1

1

21 (a) Two from:

Unlikely to be lost (if addressed correctly)

Faster to arrive

Quicker/easier to send the same message to several people

You don’t have to leave the office to send a letter

2

(b) Two from:

Very large documents can be sent/emails often have a limit to the size of

attachments

Legal documents can be sent/email signatures are not legally binding

Special delivery ensures delivery/If undelivered can be tracked/if lost can claim

compensation

Might not have the software to open attachments

Recipient may not have/doesn’t need email address/access to computers/internet

2