Answer all questions. No marks will be awarded for using brand names of software packages or hardware.

Transcription

1 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/12 Paper 1 Theory October/November hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. No calculators allowed. 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. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. No marks will be awarded for using brand names of software packages or hardware. 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. The maximum number of marks is 75. This document consists of 12 printed pages. [Turn over

2 1 There are a number of security risks associated with using the Internet. 2 Name three of these risks. For each, state why it is a risk and describe how the risk can be minimised. Security risk 1... Why it is a risk How to minimise the risk Security risk 2... Why it is a risk How to minimise the risk Security risk 3... Why it is a risk How to minimise the risk [9] 2210/12/O/N/15

3 2 Seven computer terms and seven descriptions are shown below. Draw a line to link each computer term to its most appropriate description. 3 Computer term Description Interface Reduction of file size by permanently removing some redundant information from the file Interrupt File compression format designed to make photo files smaller in size for storage and for transmission JPEG File compression system for music which does not noticeably affect the quality of the sound Lossless compression Hardware component that allows the user to communicate with a computer or operating system Lossy compression The file is reduced in size for transmission and storage; it is then put back together again later producing a file identical to the original MIDI Signal sent to a processor which may cause a break in execution of the current routine, according to priorities MP3 format Standard adopted by the electronic music industry for controlling devices such as synthesisers and sound cards [6] 2210/12/O/N/15 [Turn over

4 4 3 The flowchart on the opposite page shows what happens when the barcode on a product is scanned at the checkout in a supermarket. The barcodes are used in an automatic stock control system. Several of the statements in the flowchart are missing. Using item number only from the list below, complete the flowchart. Item number Statement 1 Add flag to product record to indicate re-order made 2 Any more barcodes to scan? 3 Has the scanned barcode been found in the file? 4 Has the re-order flag already been added to the product record? 5 Is number of product in stock <= re-order level? 6 Number of product in stock is reduced by 1 7 Output an error message 8 Automatically send out order for new product 2210/12/O/N/15

5 5 START Barcode on product is scanned END No Barcode is looked up in stock database Yes No Yes Yes No Any more barcodes to scan? No Yes Yes END No 2210/12/O/N/15 [4] [Turn over

6 4 (a) (i) Convert the following two hexadecimal numbers into binary: 6 F A 7 D 3 E F A 7 D 3 E [4] (ii) Now perform the AND (logic) operation on each corresponding pair of binary bits in the two numbers from part (i). [2] (iii) Convert your answer in part (ii) into hexadecimal. [2] 2210/12/O/N/15

7 7 (b) (i) The following code shows HTML tag pairs on either side of the text stating the colour that each creates. <font color # F F > RED </font> <font color # 0 0 F F 0 0 > GREEN </font> <font color # F F > BLUE </font> <font color # X > YELLOW </font> <font color # Y > MAGENTA </font> <font color # Z > CYAN </font> Yellow is a combination of red and green, magenta a combination of red and blue and cyan a combination of green and blue. State what 6-digit hexadecimal values should replace X, Y and Z in the above code. X... Y... Z... [3] (ii) Describe how other colours, such as a darker shade of blue, are created. [2] (c) 1A 16 C5 22 FF FF is an example of a MAC address. (i) Identify what the first six and last six hexadecimal digits represent. First six digits... Last six digits... [2] (ii) State why MAC addresses are used. [1] 2210/12/O/N/15 [Turn over

8 8 5 A security system uses sensors, a camera and a microprocessor to capture images of each person entering a large shopping mall. (a) Describe how the sensors, camera and microprocessor interact to identify certain people entering the mall [5] (b) Each image taken requires 1 MB of storage. If the camera captures an image every 5 seconds over a 24 hour period, how much storage is required? Give your answer in gigabytes and show all your working [2] (c) The shopping mall has over 100 cameras. At the end of each day all these cameras send their images, captured over the last 24 hours, to a central computer. Explain why the mall uses dedicated fibre optic cable rather than transmitting the data over the local broadband network [2] 2210/12/O/N/15

9 9 6 (a) Explain what is meant by HTML [3] (b) HTML uses both structure and presentation. Describe what is meant by the two terms. Structure Presentation [2] (c) Explain the function of a web browser [3] 2210/12/O/N/15 [Turn over

10 10 7 (a) Check digits are used to ensure the accuracy of input data. A 7-digit code number has an extra digit on the right, called the check digit. Digit position Digit The check digit is calculated as follows: each digit in the number is multiplied by its digit position the seven results are then added together this total is divided by 11 the remainder gives the check digit (if the remainder = 10, the check digit is X) (i) Calculate the check digit for the following code number. Show all your working Check digit... [2] (ii) An operator has just keyed in the following code number: X Has the operator correctly keyed in the code number? Give a reason for your answer. [3] 2210/12/O/N/15

11 11 (b) When data are transmitted from one device to another, a parity check is often carried out on each byte of data. The parity bit is often the leftmost bit in the byte. (i) If a system uses even parity, give the parity bit for each of the following bytes: parity bit parity bit [2] (ii) A parity check can often detect corruption of a byte. Describe a situation in which it cannot detect corruption of a byte....[1] 8 The steps to print a document using a laser printer are shown in the table below. Put each step in the correct order. The first step has been done for you. Step Order As the printing drum rotates, a laser scans across it; this removes the positive charge in certain areas The printing drum is coated in positively-charged toner; this then sticks to the negatively-charged parts of the printing drum The paper goes through a fuser which melts the toner so it fixes permanently to the paper The printer driver ensures that the data is in a format that the laser printer can understand 1 A negatively-charged sheet of paper is then rolled over the printing drum Data is then sent to the laser printer and stored temporarily in the printer buffer The toner on the printing drum is now transferred to the paper to reproduce the required text and images The printing drum is given a positive charge Negatively-charged areas are then produced on the printing drum; these match exactly with the text and images to be printed 2210/12/O/N/15 [8] [Turn over

12 12 9 A remote-controlled model car contains RAM, ROM and a solid state drive. The car receives radio signals from its remote control. It can only receive radio signals of a certain frequency. The manufacturer sets this frequency and the owner cannot change it. The owner of the model car can input their own sequence of movements from an interface underneath the car. (a) Describe the purpose of each of the three types of memory supplied with the car. RAM ROM Solid state drive [3] (b) The owner needs to be able to enter their own sequence of movements for the model car. Name a suitable input device. Input device Give a reason for your choice of device [2] (c) Explain why the model car uses a solid state drive rather than another type of secondary storage [2] Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 2210/12/O/N/15

13 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/13 Paper 1 Theory October/November hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. No calculators allowed. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. No marks will be awarded for using brand names of software packages or hardware. 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. The maximum number of marks is 75. This document consists of 15 printed pages and 1 blank page. [Turn over

14 2 1 (a) Name an application which makes use of the following sensors. A different application should be used in each case. Temperature Magnetic field Motion [3] (b) The flowchart on the opposite page shows how a light sensor and microprocessor are used to switch a street lamp on or off. When the sensor reading is <= 50 light units, the lamp is turned on automatically. Several of the instructions have been omitted from the flowchart. Using item numbers only from the list below, complete the flowchart: Item number Instruction 1 Count down in minutes 2 Is light reading <= 50? 3 Is street lamp already on? 4 Is time = 0? 5 The microprocessor compares the sensor reading with stored values 6 The sensor reading is sent to the microprocessor 7 Switch the street lamp off 8 Switch street lamp on 9 Time set to 10 minutes [5] 2210/13/O/N/15

15 3 START Read light sensor Yes No Yes Is street light already off? Yes No No Time set to 10 minutes Count down in minutes Yes No No Is time = 0? Yes 2210/13/O/N/15 [Turn over

16 4 2 Sensors and a microprocessor monitor a car exhaust for high temperature and high carbon monoxide (CO) levels. (a) Describe how the sensors and microprocessor are used to monitor the temperature and CO levels and warn the driver if either is out of range [5] (b) The information from seven sensors is sent to an engine management system in the car. The status of each sensor is stored in an 8-bit register; a value of 1 indicates a fault condition: parity bit CO level too high temperature fuel pressure too high too low voltage too low oil pressure too low airbag fault brake pads too thin For example, a register showing indicates: temperature too high fuel pressure too low voltage too low 2210/13/O/N/15

17 5 (i) Identify the fault condition(s) that the following register indicates: [2] (ii) The system uses odd parity. Write the correct parity bit in each register [2] (iii) A car has a faulty airbag and the CO level is too high. Write what should be contained in the 8-bit register. [2] (iv) Give the hexadecimal value of the binary number shown in part (iii)....[1] 2210/13/O/N/15 [Turn over

18 6 3 A section of computer memory is shown below: Address Contents (a) (i) The contents of memory location are to be read. Show the contents of the Memory Address Register (MAR) and the Memory Data Register (MDR) during this read operation: MAR MDR [2] (ii) The value is to be written into memory location Show the contents of the MAR and MDR during this write operation: MAR MDR [2] 2210/13/O/N/15

19 7 (iii) Show any changes to the computer memory following the read and write operations in part (a)(i) and part (a)(ii). Address Contents [1] (b) Name three other registers used in computers [3] (c) The control unit is part of a computer system. What is the function of the control unit? [3] 2210/13/O/N/15 [Turn over

20 4 (a) Computer ethics involves a number of different topics. 8 (i) A student made the following statement on an examination paper: It allows a user to have the freedom to run, copy, change and adapt the software and then pass it on to a colleague, friend or family member. Identify which computer term the student was describing.... [1] (ii) Explain what is meant by computer ethics.... [3] (b) The four statements below refer to firewalls and proxy servers. Study each statement. Tick ( ) the appropriate column(s) to indicate whether the statement refers to a firewall and/or a proxy server. Statement Firewall Proxy server Speeds up access of information from a web server by using a cache Filters all Internet traffic coming into and out from a user s computer, intranet or private network Helps to prevent malware, including viruses, from entering a user s computer Keeps a list of undesirable websites and IP addresses [4] 2210/13/O/N/15

21 (c) Explain three ways of preventing accidental loss or corruption of data [6] 2210/13/O/N/15 [Turn over

22 10 5 A security system records video footage. One minute of video requires 180 MB of storage. The recording system can store several hours of video footage. (a) Name and describe a suitable storage device for this recording system [2] (b) Calculate how much storage would be needed for 2 hours of video footage. Show your working and give the answer in Gigabytes (GB) [2] 2210/13/O/N/15

23 11 6 Passengers fly into an airport from other countries. The airport has a security system that uses: computers scanners digital cameras To gain entry to the country, each passenger must have a passport or identification (ID) card. This must contain a recent photograph and other personal data. The passenger must: place their passport or ID card on a scanner that reads machine-readable characters and scans the photograph look towards a camera that takes an image of the passenger s face Describe how a computer checks whether the image just taken by the camera matches the scanned photograph [2] 2210/13/O/N/15 [Turn over

24 12 7 Name a suitable output device for each of the following applications. A different device should be used for each application. Application Suitable output device Production of one-off photographs of very good quality... High volume colour printing of advertising flyers... Production of an object, which is built up layer by layer; used in CAD applications... Converting electrical signals into sound... Showing enlarged computer output on a wall or large screen... [5] 2210/13/O/N/15

25 13 8 Four input devices are shown in the table below. Give an application which makes use of each device and state a reason why the device is appropriate for that application. Your application must be different in each case. Input device Application and reason Application... Light sensor Reason Application... Keyboard Reason Application... Barcode reader Reason Application... Touch screen Reason [8] 2210/13/O/N/15 [Turn over

26 14 9 MP3 file compression reduces the size of a music file by 90%. (a) A music track is 80 MB in size. Calculate the file size after compression.... How many MP3 files of the size calculated above could be stored on an 800 MB CD?... [2] (b) (i) Explain how MP3 files retain most of the original music quality.... [2] (ii) State the type of file compression used in MP3 files.... [1] (iii) Name another file compression format.... [1] 2210/13/O/N/15

27 15 10 Choose five correct terms from the following list to complete the spaces in the sentences below: cypher text encryption algorithm encryption key firewall plain text proxy server symmetric encryption... is a security system. It uses the same... to encrypt and decrypt a message. Before encryption, the message is called.... The... processes the original message. The output is known as.... [5] 2210/13/O/N/15

28 16 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 2210/13/O/N/15

29 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/22 Paper 2 Problem-solving and Programming October/November hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. No calculators allowed. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. DO NOT ATTEMPT TASKS 1, 2 AND 3 in the pre-release material; these are for information only. You are advised to spend no more than 40 minutes on Section A (Question 1). No marks will be awarded for using brand names of software packages or hardware. 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. The maximum number of marks is 50. This document consists of 11 printed pages and 1 blank page. DC (LK/CGW) [Turn over

30 2 Section A You are advised to spend no longer than 40 minutes answering this section. Here is a copy of the pre-release material. DO NOT attempt Tasks 1, 2 and 3 now. Use the pre-release material and your experience from attempting the tasks before the examination to answer Question 1. Pre-release Material Write and test a program to complete the three tasks. A new born baby is kept in a cot in a hospital; the temperature of the baby is monitored every 10 minutes. The temperature of the baby is recorded in degrees Celsius to one decimal place and must be within the range 36.0 C to 37.5 C. TASK 1 To simulate the monitoring required, write a routine that allows entry of the baby s temperature in degrees Celsius. The routine should check whether the temperature is within the acceptable range, too high or too low and output a suitable message in each case. TASK 2 Write another routine that stores the temperatures taken over a three hour period in an array. This routine should output the highest and lowest temperatures and calculate the difference between these temperatures. TASK 3 For a baby who has a temperature difference of more than one degree Celsius, and/or has been outside the acceptable range more than twice in the three hour period, output a suitable message giving a summary of the problem. Your program must include appropriate prompts for the entry of data. Error messages and other outputs need to be set out clearly and understandably. All variables, constants and other identifiers must have meaningful names. Each task must be fully tested. 2210/22/O/N/15

31 1 (a) All variables, constants and other identifiers should have meaningful names. 3 (i) When you performed the tasks, you used variables. Write suitable declarations for two of these. State what you used each one for. Variable 1... Use... Variable 2... Use...[4] (ii) When you performed the tasks, you may have used constants. Write suitable declarations for two of these. State what you used each one for. Constant 1... Use... Constant 2... Use......[4] 2210/22/O/N/15 [Turn over

32 4 (b) Write an algorithm to complete Task 1, using either pseudocode, programming statements or a flowchart [5] 2210/22/O/N/15

33 5 (c) (i) Explain how you completed Task 3. You can include pseudocode or programming statements as part of your explanation. You should assume that Task 2 has been completed....[5] (ii) Comment on the efficiency of your design for Task 3....[2] 2210/22/O/N/15 [Turn over

34 6 Section B 2 Read this section of program code that should input 50 numbers and then output the average. 1 Total = 0 2 For Counter = 1 TO 50 3 INPUT Num 4 Total = Total Counter = Counter Average = Total/Counter 7 NEXT Counter 8 PRINT Average There are four errors in this code. Locate these errors and suggest code corrections to remove each error [4] 2210/22/O/N/15

35 7 Question 3 begins on page /22/O/N/15 [Turn over

36 8 3 (a) The flowchart inputs an integer. The predefined function DIV gives the integer result of the division, e.g. Y 10 DIV 3 gives the value Y = 3. The predefined function MOD gives the value of the remainder, e.g. Y 10 MOD 3 gives the value Y = 1. START Posn 1 New 0 INPUT X X T1 T1 X DIV 2 T2 X MOD 2 New New + T2 * Posn Posn Posn * 10 Yes is T1 >= 2? No New New + T1 * Posn OUTPUT New END 2210/22/O/N/15

37 Complete a trace table for each of the two input values 5 and 12. Trace table for input value 5 9 X Posn New T1 T2 OUTPUT Trace table for input value 12 X Posn New T1 T2 OUTPUT [6] (b) State the purpose of the flowchart in part (a)....[1] 2210/22/O/N/15 [Turn over

38 10 4 A routine checks the weight of melons to be sold in a supermarket. Melons weighing under 0.5 kilograms are rejected and melons weighing over 2 kilograms are also rejected. Give an example of each type of test data for this routine. Normal.. Extreme. Abnormal...[3] 5 Identify two different conditional statements that you can use when writing pseudocode [2] 6 A picture gallery owner has decided to set up a database to keep information about the pictures he has for sale. The database table, PICTURE, will contain the following fields: Title; Artist; Description; Catalogue Number; Size (area in square centimetres); Price; Arrived (date picture arrived at gallery); Sold (whether picture is already sold) (a) (i) State what data type you would choose for each field. Title... Artist... Description... Catalogue Number... Size... Price... Arrived... Sold...[4] (ii) State which field you would choose for the primary key....[1] 2210/22/O/N/15

39 11 (b) Give a validation check that you can perform on each of these fields. Each validation check must be different. Catalogue Number... Size Price... Arrived...[4] (c) Complete the query-by-example grid below to select and show the Catalogue Number, Title and Price of all unsold pictures by the artist Twister. Field: Table: Sort: Show: Criteria: or: [5] 2210/22/O/N/15

40 12 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 2210/22/O/N/15

41 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/23 Paper 2 Problem-solving and Programming October/November hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. No calculators allowed. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. DO NOT ATTEMPT TASKS 1, 2 AND 3 in the pre-release material; these are for information only. You are advised to spend no more than 40 minutes on Section A (Question 1). No marks will be awarded for using brand names of software packages or hardware. 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. The maximum number of marks is 50. This document consists of 11 printed pages and 1 blank page. DC (RW) [Turn over

42 2 Section A You are advised to spend no longer than 40 minutes answering this section. Here is a copy of the pre-release material. DO NOT attempt Tasks 1, 2 and 3 now. Use the pre-release material and your experience from attempting the tasks before the examination to answer Question 1. Pre-release Material Write and test a program to complete the three tasks. The temperature in an apartment needs to be kept between 22 C and 24 C. This is done by the use of an automatically controlled air-conditioning system, which monitors the temperature every five minutes. The temperature of the apartment is recorded, to one decimal place, in degrees Celsius. The cooling is activated when the temperature reaches 24.5 C and the heating is activated when the temperature reaches 21.5 C. TASK 1 To simulate the monitoring required, write a routine that allows entry of the apartment s temperature in degrees Celsius. The routine checks whether the temperature is within the acceptable range, too high or too low and outputs a suitable message in each case. TASK 2 Write another routine that stores, in an array, the temperatures taken over a period of five hours. This routine calculates the difference between the highest temperature and the lowest temperature. Then it outputs the highest temperature, the lowest temperature, and the difference between these temperatures. TASK 3 Write a routine to find out how often the temperature was out of the acceptable range during the five hours and whether the temperature was too high or too low; output a suitable message showing a summary of the problem. Your program must include appropriate prompts for the entry of data. Error messages and other outputs need to be set out clearly and understandably. All variables, constants and other identifiers must have meaningful names. Each task must be fully tested. 2210/23/O/N/15

43 1 (a) All variables, constants and other identifiers should have meaningful names. 3 (i) When you performed the tasks, you used variables. Write suitable declarations for two of these. State what you used each one for. Variable 1... Use... Variable 2... Use......[4] (ii) When you performed the tasks, you may have used constants. Write suitable declarations for two of these. State what you used each one for. Constant 1... Use... Constant 2... Use......[4] 2210/23/O/N/15 [Turn over

44 4 (b) Write an algorithm to complete Task 2, using either pseudocode, programming statements or a flowchart. You should assume that the temperatures taken over the five hours are already stored in an array [5] 2210/23/O/N/15

45 5 (c) (i) Explain how you completed Task 3. You should assume that Task 2 has been completed. You can include pseudocode or programming statements as part of your explanation....[6] (ii) Comment on the efficiency of your design for Task 3....[1] 2210/23/O/N/15 [Turn over

46 6 Section B 2 Read this section of program code that should input 50 numbers and then output the average of the positive numbers only. 1 Total = 0 2 PosCount = 0 3 FOR Counter = 1 TO 50 4 INPUT Num 5 IF Num < 0 THEN Total = Total + Num 6 IF Num > 0 THEN Counter = Counter Average = Total/PosCount 8 NEXT Counter 9 PRINT Num There are four errors in this code. Locate these errors and suggest code corrections to remove each error [4] 2210/23/O/N/15

47 7 Question 3 begins on page /23/O/N/15 [Turn over

48 8 3 (a) This pseudocode inputs an integer. The predefined function DIV gives the value of the division, e.g. Y 10 DIV 3 gives the value Y = 3. The predefined function MOD gives the value of the remainder, e.g. Y 10 MOD 3 gives the value Y = 1. INPUT X WHILE X > 15 DO T1 X DIV 16 T2 X MOD 16 CASE T2 OF 10:OUTPUT A 11:OUTPUT B 12:OUTPUT C 13:OUTPUT D 14:OUTPUT E 15:OUTPUT F OTHERWISE OUTPUT T2 ENDCASE X T1 ENDWHILE CASE X OF 10:OUTPUT A 11:OUTPUT B 12:OUTPUT C 13:OUTPUT D 14:OUTPUT E 15:OUTPUT F OTHERWISE OUTPUT X ENDCASE 2210/23/O/N/15

49 Complete a trace table for each of the two input values 37 and 191. Trace table for input value 37 9 X T1 T2 OUTPUT Trace table for input value 191 X T1 T2 OUTPUT [4] (b) State the purpose of the pseudocode in part (a) [2] 2210/23/O/N/15 [Turn over

50 10 4 A routine checks the age and height of children who are allowed to enter a play area. The children must be less than 5 years of age and under 1 metre in height. (a) The first set of test data used is age 3 and height 0.82 metres. State what type of test data this is.... Give a reason for using this test data [2] (b) Provide two additional sets of test data. For each, give the type of each set of test data the reason why it is used Each type of test data and reason for use must be different. Set 1... Type... Reason Set 2... Type... Reason [6] 2210/23/O/N/15

51 11 5 A motor boat hire company decides to set up a database to keep information about boats that are available for hire. The database table, BOAT, will contain the following fields: Boat Name; Model; Engine Power (in hp); Number of Seats; Life Raft (whether there is a life raft kept on the boat); Day Price (price for a day s hire). (a) Give the data type you would choose for each field. Boat Name... Model... Engine Power... Number of Seats... Life Raft... Day Price...[3] (b) State a validation check that you can perform on each of these fields. Each validation check must be different. Boat Name... Model... Number of Seats... Day Price...[4] (c) Complete the query-by-example grid below to select and show the Boat Name, Model and Day Price of a day s hire for all boats with 4 seats and an Engine Power of more than 100 hp. Field: Table: Sort: Show: Criteria: or: [5] 2210/23/O/N/15

52 12 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 2210/23/O/N/15