Cambridge International Examinations Cambridge Ordinary Level

Transcription

1 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/11 Paper 1 Theory May/June 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 12 printed pages. DC (KN/SG) [Turn over

2 1 The memory of a computer contains data and instructions in binary. The following instruction is stored in a location of the memory (a) Convert the instruction into hexadecimal.... [2] (b) Explain why a programmer might prefer to read the instruction in hexadecimal rather than in binary.... [2] (c) Give two other uses of hexadecimal. Use 1... Use 2... [2] 2 Programmers can use a high-level language to write a computer program. (a) Explain what is meant by the term high-level language.... [2] 2210/11/M/J/17

3 3 (b) A program written in a high-level language is translated into machine code. This is so that it can be processed by a computer. Name one type of translator that can be used.... [1] (c) Describe how your answer to part (b) translates this program.... [3] 3 Steffi has a number of files of different sizes that contain her work. Tick (3) to show whether each statement is true or false. Statement 47KB is larger than 10MB. true (3) false (3) 250bytes is smaller than 0.5MB. 50GB is larger than 100MB. 1TB is smaller than 4GB. [4] 2210/11/M/J/17 [Turn over

4 4 Five statements about serial half-duplex data transmission are shown in the table below. Tick (3) to show whether each statement is true or false. 4 Statement Data is transmitted in one direction only, one bit at a time. true (3) false (3) Data is transmitted in both directions, multiple bits at a time. Data is transmitted in one direction only, multiple bits at a time. Data is transmitted in both directions, but only one direction at a time. Data is transmitted one bit at a time. Data is transmitted in both directions, but only one direction at a time. Data is transmitted multiple bits at a time. [5] 2210/11/M/J/17

5 5 (a) Parity checks are often used to detect errors that may occur during data transmission. The received bytes in the table below were transmitted using odd parity. 5 Tick (3) to show whether each byte has been corrupted during transmission or not corrupted during transmission. Received byte corrupted during transmission (3) not corrupted during transmission (3) [3] (b) Another method of error detection is Automatic Repeat request (ARQ). Explain how ARQ is used in error detection.... [4] 2210/11/M/J/17 [Turn over

6 6 6 Signals are sent to and from the components of a processor using buses. Identify and describe the purpose of two different buses. Bus 1... Purpose Bus 2... Purpose [6] 2210/11/M/J/17

7 7 Six security terms and six statements are listed below. Draw a line to match the security term with the most appropriate statement. 7 Security term Statement Encryption Provides a secure connection between web browsers and websites allowing secure transmission of private data. Secure Socket Layer (SSL) Computer that acts as an intermediary between a web browser and the Internet. Pharming Legitimate-looking is sent in the hope of gathering personal information; it requires the user to click on a link in the . Phishing Uses rules and criteria, set by the user, to help protect a network or system from unauthorised access. Firewall Malicious code installed on the hard drive of a user s computer; this code will redirect the user to a fake website without the user s knowledge. Proxy server Scrambles data for secure transmission. 2210/11/M/J/17 [5] [Turn over

8 8 Complete the paragraph by choosing six correct terms from the list. Optical On-line RAM HDD Primary SSD Secondary ROM Off-line 8 A computer has two different types of memory.... memory is not directly accessed by the CPU, but it allows a user to store data that can easily be accessed by applications. Two examples of this type of memory are... and.... The second type of memory is... memory. This memory is directly accessed by the CPU. It allows the processor to access data and instructions that are stored in this memory. Two examples of this memory are... and.... [6] 2210/11/M/J/17

9 9 9 A supermarket has a system that allows customers to check out their own shopping. Identify and describe the purpose of two input devices and one output device used in this system. Input device 1... Purpose Input device 2... Purpose Output device 1... Purpose [6] 10 (a) Complete the truth table for the NOR gate. A B X A B Output (X) [1] 2210/11/M/J/17 [Turn over

10 (b) Write a logic statement that corresponds with the following logic circuit. 10 A B X C X =... [3] 11 State three functions provided by an operating system. Function Function Function [3] 2210/11/M/J/17

11 11 12 The processes in a chemical factory are monitored by sensors connected to a microprocessor. (a) Identify two different sensors used in this application. Give an example of how each sensor could be used in the chemical factory. Sensor 1... Use... Sensor 2... Use... [4] (b) Describe how the sensors and a microprocessor are used to monitor a process.... [5] 2210/11/M/J/17 [Turn over

12 12 13 (a) Gurdeep wants to send a large file to Jennifer over the Internet. State two benefits of compressing the file to send it. Benefit 1... Benefit 2... [2] (b) Two types of compression are lossy and lossless. Choose the most suitable type of compression for the following and explain your choice. (i) Downloading the code for a computer program: Type of compression... Explanation [3] (ii) Streaming a video file: Type of compression... Explanation [3] 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. 2210/11/M/J/17

13 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/12 Paper 1 Theory May/June 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 12 printed pages. DC (RW) /1 [Turn over

14 1 Name three different buses that are used in the fetch-execute cycle. 2 Bus 1... Bus 2... Bus 3... [3] 2 Give two examples of primary, secondary and off-line storage. Primary Example 1... Example 2... Secondary Example 1... Example 2... Off-line Example 1... Example 2... [6] 2210/12/M/J/17

15 3 The diagram shows five output devices and five descriptions. Draw a line between each output device and its description. 3 Output Device Description Inkjet printer Flat panel display that uses the light modulating properties of liquid crystals. LCD screen Flat panel display that uses an array of light emitting diodes as pixels. 2D cutter Droplets of ink are propelled onto paper. LED screen Electrically charged powdered ink is transferred onto paper. Laser printer High powered laser that uses the x-y plane. [4] 2210/12/M/J/17 [Turn over

16 4 4 There are various methods used to detect errors that can occur during data transmission and storage. Describe each of the following error detection methods. Parity check Check digit Checksum Automatic Repeat request (ARQ) [8] 2210/12/M/J/17

17 5 5 (a) The denary number 57 is to be stored in two different computer registers. Convert 57 from denary to binary and show your working....[2] (b) Show the binary number from part (a) as it would be stored in the following registers. Register 1 Register 2 [2] (c) A binary number stored in a register can have many different uses, for example an address in main memory. Give two other uses for a binary number stored in a register. Use 1... Use 2... [2] (d) A register in a computer contains binary digits The contents of the register represent a binary integer. Convert the binary integer to hexadecimal.....[1] 2210/12/M/J/17 [Turn over

18 6 Airline boarding passes can be read from a smartphone instead of a printout. 6 Back Boarding Pass A TSA Pre Passenger Webb / Alan Boarding Boarding Group B 15 Position Flight 683 JFK LAX Date Thursday, November 10, 2016 Departs 8.15 pm Gate C4 Time, gate and terminals may change - check monitors Fly Rewards Conf# BC123D Fly Rewards# Identify what type of barcode A is an example of. Explain how the data stored in this type of barcode is read [4] 2210/12/M/J/17

19 7 Computer A is communicating with computer B. 7 (a) Draw an arrow or arrows to show simplex, duplex and half-duplex data transmission. The direction of the data transmission must be fully labelled. Simplex data transmission Computer A Computer B Duplex data transmission Computer A Computer B Half-duplex data transmission Computer A Computer B [6] (b) State a use for the following data transmission methods. The use must be different for each data transmission method. Simplex... Duplex... [2] 2210/12/M/J/17 [Turn over

20 8 (c) A computer includes an Integrated Circuit (IC) and a Universal Serial Bus (USB) for data transmission. Describe how the computer uses these for data transmission, including the type of data transmission used. IC... USB... [4] 2210/12/M/J/17

21 8 A company has a number of offices around the world. 9 (a) Data is transmitted between the offices over the Internet. In order to keep the data safe the company is using Secure Socket Layer (SSL) protocol and a firewall at each office. Explain how SSL protocol and a firewall will keep the company s data safe. SSL protocol... Firewall... [4] (b) A company stores personal details of its customers on a computer system behind a firewall. Explain, with reasons, what else the company should do to keep this data safe....[6] 2210/12/M/J/17 [Turn over

22 10 9 A cold store is kept at a constant low temperature using a sensor, a microprocessor and a cooling unit. Explain how the sensor and microprocessor will maintain a constant low temperature [6] 2210/12/M/J/17

23 11 10 For this logic statement: (a) Draw the logic circuit. X = 1 if (( A is 1 AND B is 1 ) OR ( B is 1 AND C is NOT 1 )) A B X C [4] (b) Complete the truth table for the given logic statement. A B C Working space X [4] 2210/12/M/J/17 [Turn over

24 12 11 A company sells smartphones over the Internet. Explain how the information stored on the company s website is requested by the customer, sent to the customer s computer and displayed on the screen [7] 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/M/J/17

25 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/21 Paper 2 Problem-solving and Programming May/June 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 14 printed pages and 2 blank pages. DC (NH) [Turn over

26 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 A teacher is planning a school trip to a theme park at the end of term. You have been asked to write a program to work out the cost per student, to record those who are going and whether they have paid. The maximum number of students who can go on the trip is 45. Write and test a program for the teacher. Your program must include appropriate prompts for the entry of data. Error messages and other output need to be set out clearly. All variables, constants and other identifiers must have meaningful names. You will need to complete these three tasks. Each task must be fully tested. TASK 1 Work out the cost. The cost of the trip for each student is a share of the cost of a coach plus the cost of entry to the theme park. The total cost of the coach will be $550. The entry cost to the park is $30 for each student. The theme park gives one free ticket for every ten that are bought, which must be taken into consideration. Set up a program that: stores the cost of the coach stores the cost of an entry ticket inputs the estimated number of students taking part, this must be validated on entry and an unsuitable entry rejected calculates and outputs the recommended cost per student to ensure the trip does not make a loss. TASK 2 Record the students who are going and whether they have paid. Input and store the names of the students who have asked to go on the trip up to the maximum number allowed. Input and store whether each student has paid. Enable printouts to be produced to show students who have not paid and those who have paid. TASK 3 Work out final costs. Not all students will end up going on the trip, for example they might not have paid. Modify the program so that it gives overall totals for the costs charged and the amount of money collected. Output whether the school trip has made a profit or loss, or has broken even, and the amount of the final balance. 2210/21/M/J/17

27 1 (a) All variables, constants and other identifiers should have meaningful names. 3 (i) Name two constants you used for Task 1 and state the value of each one. Constant 1... Value... Constant 2... Value... [2] (ii) Name two arrays you used for Task 2 and state the purpose of each one. Array 1... Purpose Array 2... Purpose [2] 2210/21/M/J/17 [Turn over

28 4 (b) Write an algorithm to complete Task 1, using either pseudocode, programming statements or a flowchart. 2210/21/M/J/17

29 5...[5] 2210/21/M/J/17 [Turn over

30 6 (c) (i) Name and describe one suitable validation check you used for Task 1, and one suitable validation check for Task 2. Each check MUST be different. Task 1 Name... Description Task 2 Name... Description [4] (ii) For each validation check in part (c)(i), give an example of suitable test data and explain why you chose the test data. Test data for (c)(i) Task 1... Reason for choice Test data for (c)(i) Task 2... Reason for choice [4] 2210/21/M/J/17

31 7 (d) Explain how your program calculates whether or not you have made a profit (Task 3). Any programming statements used in your answer must be fully explained....[3] 2210/21/M/J/17 [Turn over

32 8 BLANK PAGE 2210/21/M/J/17

33 9 Section B 2 This section of program code asks for 50 numbers to be entered. The total and average of the numbers are calculated. 1 Total = 0 2 Counter = 50 3 PRINT When prompted, enter 50 numbers, one at a time 4 REPEAT 5 PRINT Enter a number 6 INPUT Number 7 Total + Number = Total 8 Number = Number UNTIL Counter = Average = Number * Counter 11 PRINT The average of the numbers you entered is, Average There are four errors in this code. State the line number for each error and write the correct code for that line. Error 1 Line number... Correct code... Error 2 Line number... Correct code... Error 3 Line number... Correct code... Error 4 Line number... Correct code... [4] 2210/21/M/J/17 [Turn over

34 10 3 A satellite navigation system works using destination details entered by the user, either a new destination or chosen from previously saved destinations. The satellite navigation system will then output directions to the destination in the form of either a visual map or a list of directions. A satellite navigation system is an example of a computer system that is made up of sub-systems. This structure diagram shows some of its sub-systems. Complete the diagram by filling in the empty boxes. Satellite navigation system Input destination Map List [2] 4 For each of the four statements in the table, place a tick in the correct column to show whether it is an example of validation or verification. Statements Validation Verification To automatically check the accuracy of a bar code To check if the data input is sensible To check if the data input matches the data that has been supplied To automatically check that all required data fields have been completed [4] 2210/21/M/J/17

35 5 (a) Describe the purpose of each statement in this algorithm. FOR I 1 TO 300 INPUT Name[I] NEXT I 11...[2] (b) Identify, using pseudocode, another loop structure that the algorithm in part (a) could have used....[1] (c) Write an algorithm, using pseudocode, to input a number between 0 and 100 inclusive. The algorithm should prompt for the input and output an error message if the number is outside this range....[3] 2210/21/M/J/17 [Turn over

36 6 This flowchart inputs a range of temperatures in degrees Fahrenheit. 12 As each temperature is input, it is compared with the previous highest temperature. If it is higher than the current highest, it replaces the previous highest temperature and then it is converted to degrees Celsius. For ease of calculation, the final step of the Fahrenheit to Celsius conversion has been approximated as division by 2. When 1 is entered, the input process stops and the highest temperature (in both Fahrenheit and Celsius) is output. START HighF -100 HighC -100 INPUT TempF Is TempF = -1? No Is TempF > HighF? No Yes Yes HighF TempF HighC (TempF-32)/2 OUTPUT 'The highest temperature is, ', HighF, ' Fahrenheit, ', HighC, ' Celsius.' END 2210/21/M/J/17

37 13 Complete the trace table for the input data: 68, 46, 50, 86, 65, 50, 40, 30, 1 HighF HighC TempF OUTPUT [5] 2210/21/M/J/17 [Turn over

38 14 7 A television (TV) store has a database table, TVSTOCK, for its new range of televisions. The table stores the screen size of each TV, whether it will show 3D, whether the screen is curved or flat, if the internet is available on the TV, if it has a built-in hard disk drive and the price. Part of the database table is shown below. TVID ScreenSize 3D CurvedFlat Internet HDD Price TV80CVINT 80 YES CV YES YES $7, TV65CVINT 65 YES CV YES YES $5, TV60CVINT 60 YES CV YES YES $4, TV60FTINT 60 YES FT YES YES $4, TV55CVINT 55 YES CV YES NO $3, TV55FTINT 55 YES FT YES NO $3, TV55FTNIN 55 YES FT NO NO $3, TV50CVINT 50 YES CV YES NO $2, TV50FTINT 50 YES FT YES NO $2, TV50FTNIN 50 YES FT NO NO $1, TV42FTINT 42 YES FT YES NO $1, TV37FTINT 37 NO FT YES NO $1, TV20FTNIN 20 NO FT NO NO $ TV15FTNIN 15 NO FT NO NO $ (a) State the type of the field TVID and give a reason for your choice....[1] (b) Complete the table with the most appropriate data type for each field. Field name Data type ScreenSize 3D CurvedFlat Internet HDD Price [3] 2210/21/M/J/17

39 15 (c) Use the query-by-example grid below to provide a list of all of the curved screen TVs that have a built-in hard disk drive. Make sure the list only displays the TVID, the price and the screen size in ascending order of price. Field: Table: Sort: Show: Criteria: or: [5] 2210/21/M/J/17

40 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. 2210/21/M/J/17

41 Cambridge International Examinations Cambridge Ordinary Level * * COMPUTER SCIENCE 2210/22 Paper 2 Problem-solving and Programming May/June 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 The organiser of a senior citizens club arranges outings for the members. For each of these outings a coach is hired, meals at a restaurant are reserved and tickets for the theatre are booked. A program is required to work out the costs and provide a printed list showing everyone on the outing. Write and test a program for the club organiser. Your program must include appropriate prompts for the entry of data. Error messages and other output need to be set out clearly. All variables, constants and other identifiers must have meaningful names. You will need to complete these three tasks. Each task must be fully tested. TASK 1 Work out the total cost of the outing. The organiser finds out how many senior citizens would be interested in the outing. The program for TASK 1 works out the cost from this information. Number of people Hire of coach ($) Cost of a meal ($) Cost of a theatre ticket ($) The minimum number of senior citizens needed for the outing to go ahead is 10; there cannot be more than 36 senior citizens on the outing. A minimum of two carers must go on the outing, with an additional carer needed if more than 24 senior citizens go on the outing. Carers do not have to pay anything for the outing. Work out the total cost and the cost per person for the senior citizens. TASK 2 Record who is going on the outing and how much has been paid. Using your results from TASK 1, record the names of the people on the outing and the amount they have paid; include the carers on the outing. If there are spare places on the coach then extra people can be added; they are charged the same price as other senior citizens. Calculate the total amount of money collected. Print out a list of the people on the outing. TASK 3 Identify the break-even point or profit that will be made on the outing. Show whether the outing has made a profit or has broken even using the estimated cost from TASK 1 and the money collected from TASK /22/M/J/17

43 1 (a) All variables, constants and other identifiers should have meaningful names. 3 (i) For a variable that you have used to record information about the cost of the outing in Task 1, state the name, data type and its use. Variable name... Data type... Use... [3] (ii) State two constants that you could have used for Task 1. Give the value that would be assigned to each one and explain what it is used for. Constant 1 name... Value 1... Use 1... Constant 2 name... Value 2... Use 2... [6] (b) Explain how you would need to change your calculation in Task 1 if each carer were paid $20.00 for coming on the outing....[2] 2210/22/M/J/17 [Turn over

44 4 (c) Write an algorithm to complete Task 2, using either pseudocode, programming statements or a flowchart. You can assume that Task 1 has been completed. You do not need to produce the list of people on the outing. 2210/22/M/J/17

45 5...[5] 2210/22/M/J/17 [Turn over

46 6 (d) Explain how your program completes Task 3. Any programming statements used in your answer must be fully explained....[4] 2210/22/M/J/17

47 7 Section B 2 (a) Write an algorithm to input three different numbers, and then output the largest number. Use either pseudocode or a flowchart....[4] (b) Give two sets of test data to use with your algorithm in part (a) and explain why you chose each set. Test data set 1... Reason... Test data set 2... Reason... [4] 2210/22/M/J/17 [Turn over

48 8 3 This flowchart inputs the weight of items in kilograms to be loaded on a trailer. Any item over 25 kilograms is rejected. The trailer can take up to 100 kilograms. START TotalWeight 0 Reject 0 INPUT Weight No Is Weight 25? Yes Reject Reject + 1 TotalWeight TotalWeight + Weight No Is TotalWeight 100? Yes TotalWeight TotalWeight Weight OUTPUT 'Weight of items ' TotalWeight, ' Number of items rejected ',Reject END 2210/22/M/J/17

49 9 Complete the trace table for the input data: 13, 17, 26, 25, 5, 10, 15, 35, 20, 15 Weight Reject TotalWeight OUTPUT [5] 2210/22/M/J/17 [Turn over

50 10 4 An algorithm has been written in pseudocode to input 100 numbers and print out the sum. A REPEAT UNTIL loop has been used. Count 0 Sum 0 REPEAT INPUT Number Sum Sum + Number Count Count + 1 UNTIL Count > 100 PRINT Sum (a) Find the error in the pseudocode and suggest a correction. Error... Correction... [2] (b) Rewrite the correct algorithm using a more suitable loop structure....[3] 2210/22/M/J/17

51 11 5 A database table, SHEEP, is used to keep a record of the sheep on a farm. Each sheep has a unique ear tag, EARnnnn; n is a single digit. The farmer keeps a record of the date of birth, the gender and the current weight of each sheep in kilograms. (a) Identify the four fields required for the database. Give each field a suitable name and data type. Provide a sample of data that you could expect to see in the field. Field 1 name... Data type... Data sample... Field 2 name... Data type... Data sample... Field 3 name... Data type... Data sample... Field 4 name... Data type... Data sample... [8] (b) State the field that you would choose as the primary key....[1] (c) Using the query-by-example grid below, write a query to identify the ear tags of all male sheep weighing over 10 kilograms. Only display the ear tags. Field: Table: Sort: Show: Criteria: or: [3] 2210/22/M/J/17

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. 2210/22/M/J/17