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This document consists of 14 printed pages and 2 blank pages.BR (CG) S35445/2 CIE 2003 [Turn over

CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

COMPUTER STUDIES 0420/01, 0421/01Paper 1

May/June 2003

2 hours 30 minutesCandidates answer on the Question Paper.Additional Materials: As listed in Instructions to Supervisors

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen in the spaces provided on the Question Paper.You may use a soft pencil for any diagrams, graphs, music or rough working.Do not use staples, paper clips, highlighters, glue or correction fluid.

Answer all questions.At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.

Centre Number Candidate Number Name

For Examiners Use

If you have been given a label, look at thedetails. If any details are incorrect ormissing, please fill in your correct detailsin the space given at the top of this page.

Stick your personal label here, ifprovided.

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

(a) check sum

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(b) relational database

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(c) random access memory (RAM)

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(d) top-down design

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(e) alphanumeric characters

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

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3 (a) State two sensors that would be used in a microprocessor-controlled camera.

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

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4 (a) State two types of computer crime.

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(b) Describe two ways of protecting against computer crime.

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5 (a) State the purpose of a compiler.

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(b) State one difference 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) State two ways in which these photographs can be edited using graphics software.

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

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(c) State one 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.

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(b) State two file management tasks that would be carried out by an operating system.

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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) State three reasons why the shop owner would want a computerised system.

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

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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) State two ways that a report could be sent to the office using the Internet.

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

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

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(e) Give two disadvantages for the employee of teleworking.

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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

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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.

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(c) Columns D, E and F contain formulae. Write down a formula that could be in cell F7 tocalculate the Total Sales.

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

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

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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?

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

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REF AREA TYPE FEATURE RENT($) H002 South Detached Waterfall 21000H006 South Bungalow Pool 19000H008 West Bungalow Pond 15000H005 South Detached Patio 14000H003 North Semi-Detached Pool 12000H009 North Detached Courtyard 11000H004 West Bungalow Pool View 9000H001 South Semi-Detached Fish Pond 8000H007 North Terraced BBQ Pit 2000

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

(FEATURE = Pool) OR (TYPE = Bungalow)

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

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

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13 Read this algorithm.

input A, B

if A > B then

T = A

A = B

B = T

endif

output A, B

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

41, 38

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(b) Explain the purpose of the variable T.

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(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.

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

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(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.

State four benefits of using a CAD program to do this.

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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 the

Internet.

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This document consists of 16 printed pages.SP (SLM) S51404/4 UCLES 2004 [Turn over

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

COMPUTER STUDIES 0420/01Paper 1

May/June 2004

2 hours 30 minutesCandidates answer on the Question Paper.No Additional Materials are required.




Centre Number Candidate Number Name

For Examiners Use

If you have been given a label, look at thedetails. If any details are incorrect ormissing, please fill in your correct detailsin the space given at the top of this page.

Stick your personal label here, ifprovided.


20420/01/M/J/04


(a) byte ..................................................................................................................................

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(b) compiler ............................................................................................................................

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(c) handshaking .....................................................................................................................

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(d) technical documentation ..................................................................................................

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(e) simulation .........................................................................................................................

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2 (a) Give one example of wireless technology.

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(b) Give one benefit and one disadvantage of the use of wireless technology.

Benefit ..............................................................................................................................

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Disadvantage ...................................................................................................................

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3 (a) State two places where robots are used.

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(b) State two benefits of using robots.

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4 (a) State two effects of a computer virus.

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(b) State two ways of protecting computers against viruses.

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5 Interfaces enable computer users to interact with the operating system.

State three advantages for using a graphical user interface (GUI) for loading programs andfiles.

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6 (a) Name one item used in the home, other than a computer, that contains amicroprocessor.

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(b) For your item named in (a) describe two different tasks that the microprocessorperforms.

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7 A programming language has instructions for moving a pen on a piece of paper. Examples are:

F10 Move forward 10 cmB20 Move backwards 20 cmR90 Turn right 90 degreesL90 Turn left 90 degrees

Read the following set of instructions which makes the pen draw the rectangle below andstudy the drawing that is produced.

Write a set of instructions that would produce the following drawing:

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F2R90F4R90F2R90F4R90

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4 cm

2 cm2 cm

START4 cm

4 cm

4 cm

2 cm

START

2 cm

2 cm

2 cm

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8 A school wants to create its own website to advertise the school.

(a) State the type of software that would be used to create a web page.

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(b) State two features of the software used to design web pages.

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(c) State where the finished website would be stored so that people surfing the Internet canvisit it.

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9 A supermarket uses point of sale (POS) terminals at the checkout for scanning barcodes onthe products.

(a) State two items of data that are stored on the barcode.

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(b) Describe how the computer system checks that the barcode has been read correctly.

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(c) State the type of file access that is used to get the price from the central computer.

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(d) Explain how the system updates the file when an item has been sold.

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(e) Give two benefits for the supermarket manager of using point of sale (POS) terminals.

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10 (a) A company has decided to use a computer for stock control. Describe the process ofsystems analysis from the time the decision was made to proceed with computerisationuntil final testing.

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(b) Give two reasons why it may be necessary to modify this system in the future.

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11 A family has purchased a computer system with the following specification:

Processor speed 2200 MHzRAM 512 MegabyteHard disk drive 120 GigabytesCD ROMDVD writerModem 56kMonitor 17"

(a) The computer has been purchased for buying goods and services over the Internet.Explain how each of these items of hardware would be used for this purpose.

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(b) State the type of software that is needed for logging onto the Internet and findingwebsites selling goods and services.

logging on .........................................................................................................................

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(c) State one advantage and one disadvantage for customers of using the Internet forshopping.

advantage ........................................................................................................................

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(d) Describe two effects on society of an increase in the use of the Internet for e-commerce.

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12 The following spreadsheet shows the profit or loss on sales at an ice-cream stall during afour week period.

(a) State the format of the data in cell B6.

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(b) Write down a formula that could be in cell D7 to calculate the Income for week 1.

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(c) Describe how the formula in D7 can be copied into the cells D8, D9 and D10.

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(d) Cell F7 contains the function:

=IF(D7 > E7, Profit, Loss)

and is copied into cells F8, F9 and F10. Write down the function that will be in cell F10.

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(e) State the cells that are needed to create a line graph to show the Income and Expensesfor Week 1 to Week 4.

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A B C D E F1 Ice-Cream Stall2 Cost

Price ($)3 Ice-Cream 34 Orange Juice 256 Ice-Cream Orange Income ($) Expenses ($) Profit/Loss

Sales Juice Sales7 Week 1 300 40 980 900 Profit8 Week 2 250 10 770 900 Loss9 Week 3 450 10 1370 900 Profit10 Week 4 300 20 940 900 Profit

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13 A city uses a computerised traffic control system.

(a) State two benefits of using computerised traffic control systems.

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(b) Describe the input, processing and output from this control system.

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(c) Describe what the traffic control program should do when an emergency occurs.

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14 A surgery uses a star local area network (LAN) to access the Internet (WAN) and to storethe patient database.

(a) Give one reason why the surgery has installed a star network rather than a ringnetwork.

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(b) Draw and label the star network used by the surgery.

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(c) Give two benefits for the surgery of storing the patient database on the LAN.

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(d) State two data protection rules that the surgery staff must obey.

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(e) Describe how the database can be recovered from a system failure.

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15 Read this algorithm. The algorithm converts a temperature from degrees Centigrade todegrees Fahrenheit.

(a) Write down the output for each of the following inputs:

(i) 1

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(ii) 5

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InputC_temp

OutputF_temp

F_temp = (1.8 C_temp) +32

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(b) Using pseudocode, or otherwise, write an algorithm that will input the hourlytemperatures for one day in Centigrade and print out in Fahrenheit

the maximum temperature the minimum temperature the average temperature

for that day.

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16 A music club keeps a file of members on a computer system. Part of the file is shown in thefollowing diagram:

(a) State how many fields there are in each record.

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(b) State the data type that should be used for the CODE data.

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(c) State two reasons why the data in the SEX field has been coded.

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(d) Which CODE data will be listed if the following search condition is input?

(DATE OF BIRTH< 01/01/87) AND (SEX = M)

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(e) Describe how the file can be sorted in ascending order of SURNAME.

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CODE SURNAME INITIAL SEX PHONE NO DATE OF BIRTHM1001 Philips R F 3294625 11/12/86M1011 Patel P M 2453674 04/01/88M1025 Brown A F 2756484 15/05/86M1037 Khan S. L M 2759815 18/02/87M1057 Lee B. R M 2456785 21/07/86M1073 Smith L F 3297684 09/02/88M1096 Chong M. A M 2765492 03/09/87M1102 Schon G M 2451843 22/04/88M1124 Shah J. A M 3298746 14/04/86M1139 Davies S. L F 2768798 09/01/88

This document consists of 15 printed pages and 1 blank page.SP (CW) S92058/5.1 UCLES 2005 [Turn over

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

COMPUTER STUDIESPaper 1

0420/01May/June 2005

2 hours 30 minutesCandidates answer on the Question Paper.Additional Materials: As listed in Instructions to Supervisors




DO NOT WRITE IN THE BARCODE.DO NOT WRITE IN THE GREY AREAS BETWEEN THE PAGES.

For Examiners Use

Candidate

Name

Centre

Number

Candidate

Number


20420/01/M/J/05


(a) buffer .................................................................................................................................

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(b) gateway .............................................................................................................................

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(d) polling................................................................................................................................

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(e) data-logging ......................................................................................................................

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2 State three tasks done by the operating system.

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

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

ForExaminers

Use

UCLES 2005

30420/01/M/J/05 [Turn over

3 Data Protection Rules give legal rights to individuals and state that personal data stored oncomputer systems must be kept secure.

(a) Give one legal right for individuals.

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

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

(b) Give one software method of protecting personal data.

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

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

(c) Give one hardware method of protecting personal data.

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

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

4 (a) A digital camera contains a microprocessor. State the input and the processing done bythe microprocessor when a person takes a photograph.

Input ..................................................................................................................................

Processing ........................................................................................................................

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

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

(b) State two reasons why the photograph costs less using the digital camera than it wouldcost if a non-digital camera was used.

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

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

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

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

ForExaminers

Use

UCLES 2005

40420/01/M/J/05

5 A shop keeps its stock file on a computer system. Part of the file is shown in the diagrambelow:

The following codes have been used.

B = Black G = Green R = Red S = Silver

(a) State how many records are shown in the diagram.

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

(b) State two advantages of coding the data in the COLOUR field.

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

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

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

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

(c) State the data type that should be used for the WEIGHT (KG) data.

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

(d) State one advantage of using fixed-length records for storing the data.

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

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

ForExaminers

Use

UCLES 2005

STOCK NO DESCRIPTION COLOUR WEIGHT (KG) IN STOCK PRICE ($)L801 Laptop Case B 1.6 15 100

L802 Beauty case B 2.6 12 80

L803 Carry-on case B 2.0 18 160

L807 Day pack R 0.6 22 90

L808 Rucksack G 1.8 16 60

L809 Backpack B 3.8 17 76

L814 Portfolio B 0.4 20 25

L816 Travel bag G 4.3 16 70

L817 Roller bag B 2.7 19 180

L820 Deluxe case S 2.6 12 165

50420/01/M/J/05 [Turn over

(e) Which STOCK NO data will be listed if the following search condition is input?

(COLOUR NOT B) AND (WEIGHT (KG) < 2.0)

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

(f) Write down a search condition that will search for all the items with less than 16 in stockand the price is more than $100.

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

(g) State which field should be used to link this stock file to a supplier file. Give a reason foryour choice of field.

Field ..................................................................................................................................

Reason..............................................................................................................................

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

ForExaminers

Use

UCLES 2005

60420/01/M/J/05

6 The following spreadsheet shows the 2-Night Bargain Break holiday bookings during a threemonth period. ForExaminers

Use

UCLES 2005

A B C D E F

1 2-Night Bargain Break Holiday Bookings

2

3 Priced at $ 1004 Bookings

5 Hotel Nov Dec Jan Total Bookings Income ($)6

7 Beach Resort 3 5 1 9 900

8 Oriental Hotel 7 8 5 20 2000

9 Palace Hotel 8 9 8 25 2500

10 Orchard Inn 6 6 3 15 1500

11 Grande Hotel 2 5 3 10 1000

12

13 Total Bookings 26 33 20 79

14 Total Income($) 790015

70420/01/M/J/05 [Turn over

(a) Write down a cell that contains a label.

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

(b) Write down a formula that could be in cell F7 to calculate the income for the hotelnamed Beach Resort.

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

(c) Describe how the formula in B13 can be copied into the cells C13, D13 and E13.

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

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

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

(d) State the cells that are needed to create a bar chart showing the Total Bookings foreach of the hotels.

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

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

(e) The data in row 7 to row 11 needs to be sorted into descending order of income.

(i) Describe how this sort will be done.

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

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

(ii) Write down the Hotel names in the order that they will appear after this sort hasbeen done.

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

ForExaminers

Use

UCLES 2005

80420/01/M/J/05

7 State three ways that computers help the police detect crime.

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

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

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

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8 A microproces

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