CS(N5)16A Computing Science

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FOR OFFICIAL USE National Qualifications Mark CS(N5)16A Computing Science Duration 1 hour and 30 mins Fill in these boxes and read what is printed below.

questions in this section. SECTION 2 70 marks Attempt ALL questions in this section. Read all questions carefully before attempting.

1 FOR OFFICIAL USE National Qualifications Mark CS(N5)16A Computing Science Duration 1 hour and 30 mins Fill in these boxes and read what is printed below. Full name of centre Town Forenames(s) Surname Number of seat Date of birth Day Month Year Scottish candidate number D D M M Y Y Total marks 90 SECTION 1 20 marks Attempt ALL questions in this section. SECTION 2 70 marks Attempt ALL questions in this section. Read all questions carefully before attempting. Write your answers in the spaces provided, using blue or black ink. Show all workings. Before leaving the examination room you must give this booklet to the invigilator. If you do not, you may lose all marks for this paper Perfect Papers All rights reserved

2 SECTION 1 20 marks Attempt ALL questions 1. Convert the decimal number 178 into the equivalent 8-bit binary number A computer program is created to store data about the total amount of money taken at a school raffle. State the most suitable data type for the total The pseudocode shown below uses a simple condition. IF pass = VIP THEN SEND Special Guest TO DISPLAY Create a complex condition that will display standard seating if a person has a Reserved pass or a Guest pass. 2 Page two

3 4. A web browser allows a user to add bookmarks to remember websites of interest. State one other feature of a web browser This pseudocode allows the user to set the temperature for his/her central heating in degrees centigrade. Line 1 RECEIVE temperature FROM (INTEGER) KEYBOARD Line 2 WHERE temperature < 10 OR temperature > 24 DO Line 3 Line 4 SEND Temperature outwith comfortable range, try again TO DISPLAY RECEIVE temperature FROM (INTEGER) KEYBOARD Line 5 END WHILE Complete the table below to show normal and exceptional test data for temperature. 2 Type of Test Data Test Data Normal Exceptional Page three

6. Charlie is designing a web page for a book store. Here is part of the page design. Give two improvements that could be made to make the page easier to use. 2 1. 2. 7.

4 6. Charlie is designing a web page for a book store. Here is part of the page design. Give two improvements that could be made to make the page easier to use Explain the purpose of lines 6 to 9 in this pseudocode. Line 6 REPEAT Line 7 SEND Please enter your selection TO DISPLAY Line 8 RECEIVE choice FROM (STRING) KEYBOARD Line 9 UNTIL choice >=1 AND choice <=4 2 Page four

5 8. a) Explain why web data is often compressed by a server when it is transferred to a client. 1 b) Explain what has to be done to the data received at the client before it can be displayed State the data type of the variable found in the code below. 1 Line 24 SET found to FALSE Line 25 SET location TO 0 Line 26 REPEAT Line 27 IF haystack[location] = needle THEN Line 28 SET found = TRUE Line 29 END IF Line 30 SET location TO location + 1 Line 31 UNTIL found = TRUE OR location = Indentation of code is one method of improving the readability of program code. Describe two other methods of improving readability Paul has connected his games console to his next door neighbours Wi-Fi by guessing the password. State the law that he has broken. 1 Page five

12. Describe how phishing can be an online security risk. 2 13.

6 12. Describe how phishing can be an online security risk All of the links in this information system have been tested. State one other type of testing that is used in this information system. 1 Page six

7 SECTION 2 70 Marks Attempt ALL questions 14. The Pseudocode for a program to calculate the payment due for a number of hours worked is shown below. Line 12 SET payrate TO 8.59 Line 13 RECEIVE hoursworked FROM (REAL) KEYBOARD Line 14 SET paydue TO payrate * hoursworked (a) Explain how the value in the variable paydue will be stored in the computer. 2 (b) The programmer writing the program, implements sections of code and then tests them. During one of these tests the program stops running after a few lines and an error is reported. (i) State the type of translator used by the programmer. 1 (ii) State one disadvantage of using this type of translator. 1 (c) At one point during implementation the programmer mis-types the word RECEIVE, typing RCEIVE instead. State the type of programming error that the programmer has introduced. 1 Page seven

8 14. (continued) (d) A diagram of a computer system is shown below. (i) Name the part of the processor labelled A above. 1 (ii) Name the part of the computer system labelled B above. 1 Page eight

9 14. (continued) (e) The following part of the program is executed. Line 14 SET paydue TO payrate * hoursworked Name the part of the computer system that will carry out each of the following tasks. (i) Performs the calculation. 1 (ii) Carries the location of paydue in main memory. 1 (iii) Carries the result of the calculation from the processor to the main memory. 1 (f) This line of the program receives a value from the keyboard. Line 13 RECEIVE hoursworked FROM (REAL) KEYBOARD This value should be restricted so that it is at least 1 and less than 42. (i) State the standard algorithm that is used to ensure that data entered is acceptable. 1 (ii) Using pseudocode or a programming language of your choice, write the code to ensure that only acceptable values for hoursworked are processed. 3 Page nine

10 15. Here is the Computing Science section of the Perfect Papers Web Site. (a) Describe one purpose of this section of the website. 1 (b) State the domain name of this webpage URL. 1 Page ten

11 15. (continued) (c) The HTML for the logo uses the img element shown below. <img src= /cdn-images/pplogo.png /> (i) Name the standard file format used to store the image. 1 (ii) The image could have been stored using the GIF image format. Identify two reasons why the format given in (i) above is more appropriate than GIF (d) The web page design includes several features to aid accessibility. (i) Identify one of these features. 1 (ii) Explain how this feature aids accessibility. 1 (e) John is a teacher and can download papers from the website. Describe one concern that a teacher may have when downloading a paper from the site. 1 Page eleven

15. (continued) (f) John uses the Advanced Search section of the site to show all the Computing Science papers. Circle one example on the webpage above that might make use of JavaScript.

12 15. (continued) (f) John uses the Advanced Search section of the site to show all the Computing Science papers. Circle one example on the webpage above that might make use of JavaScript. 1 (g) Describe how the list of papers above has been sorted. 2 (h) Clicking on the name of a paper opens the paper s page on the website in a new window. Explain why the HTML code for these links uses relative addressing. 1 Page twelve

13 16. Drop Design is a web design company. The company has a number of templates which they use with clients to quickly start new website projects. One of these templates is shown below. (a) The template shown above provides consistency of font, colour, style and size of text. Identify other features to aid good user interface design. 2 Page thirteen

14 Q16. (continued) (b) The completed web site is created using HTML. (i) State the feature of HTML code that allows the pages on the website to be formatted. 1 (ii) The images for the web site are held on a separate server as shown in the diagram below. State the type of addressing that should be used to include the file image1.jpg in the index.html page. 1 (iii) The server cdn.dropdesign.co.uk is part of a cloud storage service. Describe how cloud storage can be used to provide improved access to the images for the web site. 2 Page fourteen

15 16. (continued) (c) Image1.jpg, before editing, is 5 inch by 6 inch with a resolution of 300 dpi and 16-bit colour depth. Calculate the file size of the image and state your answer in appropriate units. Show all your working. 3 (d) The website contains a search engine. Explain how a search engine is used to produce a list of results. 2 Page fifteen

16 17. A program is written to calculate the cost of employing road crew for a rock band tour for a number of days. Each crew member is normally paid 150 per day but will earning twice that if the crew is working in stadiums. If there are more than 10 road crew then a tour manager is required and he/she is paid 1.5 times what the crew are paid. An incomplete design for the program is shown below. Line 1 SET crewpay TO 150 Line 2 SEND Enter the number of road crew and the type of tour TO DISPLAY Line 3 RECEIVE numberofcrew FROM ( ) KEYBOARD Line 4 RECEIVE numberofdays FROM ( ) KEYBOARD Line 5 SEND Is this a Statium Tour? TO DISPLAY Line 6 RECEIVE stadiumtour FROM ( ) KEYBOARD Line 7 IF statiumtour = True THEN Line 8 SET crewpay TO crewpay * 2 Line 9 END IF Line 10 SET totalcrewpay = numberofcrew * numberofdays * crewpay Line 11 IF numberofcrew > 10 THEN Line 12 totalcrewpay = totalcrewpay + (crewpay * numberofdays * 1.5) Line 13 SET numberofcrew = numberofcrew + 1 Line 14 END IF Line 15 SEND [ The total pay for & numberofcrew & road crew for & numberofdays & is & totalcrewpay] TO DISPLAY (a) The above design should show the type of data being entered from the keyboard in Lines 3, 4 and 6. State the most appropriate data types for the following variables. 3 numberofcrew numberofdays stadiumtour Page sixteen

1 (c) The program is later improved to store the totalcrewpay for ten different tours.

17 17. (Continued) (b) (i) State the lines of pseudocode that contain conditional statements. 2 (ii) State the part of the processor that compares the values in a conditional statement. 1 (c) The program is later improved to store the totalcrewpay for ten different tours. (i) State the data structure that would be required to store the list of totalcrewpay values. 2 (ii) State the type of loop required to repeat the code in lines 1 to 12 for each of the ten tours. Explain why this type of loop would be used. 2 Type of Loop Explanation (d) A logo for one of the rock bands is shown below. Describe how the circle element of the logo would be saved as a vector graphic. 2 Page seventeen

18 18. GuitarStore are organising the catalogue of guitars and accessories that they sell. GuitarStore want to store the details of products and the companies who manufacture them. Some sample data is shown in the table below. Manu Manufacturer Code Name Sales ProdRef Product Name Price MU01 Fender 7627 TelecasterMX MU01 Fender 8762 Statocaster MU02 Gibson 4241 Flying V MU04 Rickenbacker sales@riclenbacker.net C Colorado MU04 Rickenbacker sales@riclenbacker.net / (a) To avoid data duplication, a database with two linked tables is proposed a MANUFACTURER table and a PRODUCT table. (i) List the fields/attributes that should be included in each table. 2 MANUFACTURER table PRODUCT table (ii) Identify the foreign key used to link the two tables. 1 (iii) Identify the primary key of the PRODUCT table. 1 Page eighteen

19 18. (continued) (b) GuitarStore have created a design for a possible mobile app for their business. (i) Identify one feature that makes this a suitable user interface for a mobile app. 1 (ii) It is intended that when a visitor selects Fender, a list of all Fender guitars will be displayed. Describe what happens within the database when this button is selected. 2 Page nineteen

20 19. Stephen has a business which creates image adverts for LCD digital signage displays in local shops, petrol stations and bus stops. Each digital signage display shows a number of digital images from a 128 Gigabyte memory card. (a) The memory cards used in the digital signage displays are examples of solid state storage. Explain why this is more suitable for the digital signage displays than magnetic storage. (b) If a digital image is 50 Megabytes in size, calculate how many digital images Stephen will be able to store on a memory card before it is full. Show your working. 2 2 Page twenty

21 19. (continued) (c) Stephen uses a laptop to create digital images with his clients for the digital signage displays. Describe two advantages of using a laptop rather than a tablet or smartphone for this task. 2 Advantage 1 Advantage 2 (d) Stephen is aware that he has environmental responsibilities as the owner of a business that uses computer equipment. He takes steps to reduce the carbon foot print of his business. (i) Explain what is meant by a carbon footprint. 1 (ii) Describe two ways that Stephen could change the operation of the digital signage displays to use less energy. 2 Page twenty-one

22 20. A local drone shop has a flat file database storing information on just under 10,000 products that it stocks. Part of the database is shown below. Section ID Section Section Product Stock ID Name Manager Type Product Name 7 Motors J. Mason Volt Dyno Blades W. Reith 2882 Plastic 6 StyleBlade 3 Assembled R. Simpson 3911 Mid-size 361 Skyfly 6 GPS M. Shaw 6598 Tracker Locate 920 GT 12 Accessories C. Chisholm 0726 Mount Gimbal Motors J. Mason Volt Honda Accessories C. Chisholm 9201 Remote Controller A12 (a) The design structure of the database looks like this. Field Name Field Type Field Size Validation Section ID Number 0> AND < 20 Section Name Text 12 Section Manager Text 20 Stock ID Number Product Type Text 20 Product Name Text 25 Name two types of validation that could be applied to the field Stock ID. 2 Validation 1 Validation 2 (b) The drone store decides to change the name of the Accessories section to Add-ons. Describe a potential problem when changing this data in a flat file database design. 1 Page twenty-two

23 [B Q20. (continued) (c) A change is required to the database to make it more useful. The fields: InStock and Item Price Section Section Section Stock Product Item Product Name InStock ID Name Manager ID Type Price 10 Blades W. Reith 2882 Plastic 6 StyleBlade False Motors J. Mason Volt Dyno 210 True Name a suitable field type for each of the new fields. 2 InStock Item Price [END OF QUESTION PAPER] Page twenty-three

24 ADDITIONAL SPACE FOR ANSWERS Page twenty-four

25 ADDITIONAL SPACE FOR ANSWERS Page twenty-five

NOT FOR USE AS AN EXAM SAMPLE COPY - CS(H)15A. National Qualifications. Computing Science D D M M Y Y. Mark. Total marks 90

NOT FOR USE AS AN EXAM SAMPLE COPY - CS(H)15A. National Qualifications. Computing Science D D M M Y Y. Mark. Total marks 90 FOR OFFICIAL USE National Qualifications Mark CS(H)15A Computing Science Duration 2 hours Fill in these boxes and read what is printed below. Full name of centre Town Forenames(s) Surname Number of seat