9626_m17_qp_32
A paper of Information Technology, 9626
Questions:
10
Year:
2017
Paper:
3
Variant:
2
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3
Fig. 1 shows a sequence of tasks that are required to complete a project. Start of Project Task 1 Task 2 Task 3 Task 4 Finish of Project Task 5 Fig. 1 The duration of each task is shown in this table: Task Duration 3 There are three paths through this set of tasks. Use the information given in Fig. 1 and in the table to determine the critical path through the sequence of tasks. Each task can have an extra amount of time allowed over its stated duration before it causes the project to be delayed. This is the ‘float’. Explain how you would calculate the float for each of the tasks in the project.
15. Project management  →  15.3. Tools and techniques for project management tasks
15. Project management  →  15.1. The stages of the project life cycle
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5
Global positioning systems (GPS) are used by navigation devices to allow drivers of cars to find locations and destinations. Describe how GPS signals from satellites are used by navigation devices to determine a location. Describe the factors that could degrade a GPS signal, when it is transmitted to a navigation device, and affect the accuracy of the location found by that device.
14. Communications technology  →  14.8. Mobile communication systems
3. Monitoring and control  →  3.1. Monitoring and measurement technologies
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7
Electronic data exchange is often called electronic data interchange. An online retailer and its trading partners use electronic data interchange (ED. Define EDI. The retailer has prepared an order that has to go to a supplier. When the supplier has received the order, an invoice asking for payment for the goods has to go back to the retailer. Explain how you would use EDI for these transactions.
1. Data processing and information  →  1.5. Data processing
10. Database and file concepts  →  10.1. Creating a database
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9
JavaScript can be embedded in the code of web pages to add interactivity to a page. Jonas uses JavaScript code to store, list and display the names of cities on a web page. Two methods of storing the names are shown below. Method 1: var city1 = "London"; var city2 = "Cambridge"; var city3 = "Oxford"; var city4 = "Manchester"; Method 2: var city = ["London", "Cambridge", "Oxford", "Manchester"]; Explain why storing the names using Method 2 is more suitable for storing large numbers of cities. Jonas has added some lines to the JavaScript code: /* The code below stores the list of cities. */ var city = ["London", "Cambridge", "Oxford", "Manchester"]; Explain why Jonas would have added the new code to the script. Jonas wants to extract ‘Oxford’ from the list in the code below to display it on the web page. var city = ["London", "Cambridge", "Oxford", "Manchester"]; Write a line of JavaScript code to access the list and store the city name. Write a loop in JavaScript code to extract and display the first three city names.
21. Programming for the web  →  21.1. Programming for the web
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10
A new computer system is to be developed for a factory. You have been asked to gather information from the managers, assembly-line workers and clerical staff about the current system. The managers can be available at any time, the assembly-line workers must not be interrupted at any time and do not like taking work home, and the clerical staff are very busy during their working hours and do not like being watched. Describe, with reasons, the method of research you would use to gather information from each group. Managers: Assembly-line workers: Clerical staff:
16. System life cycle  →  16.2. Analysis
16. System life cycle  →  16.5. Implementation
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