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1

Encryption can be used to protect data. Define encryption. Explain how intercepted data could be misused if it was not encrypted.

1. Data processing and information  →  1.3. Encryption

Open

2

Describe what is meant by a smart home.

3. Monitoring and control  →  3.2. Control technologies

1. Data processing and information  →  1.5. Data processing

Open

3

Explain why a compiler may not be suitable for translating a high level language program for use on different computer systems.

2. Hardware and software  →  2.2. System software

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4

The digital divide can exist between people in less industrially developed nations and those in more industrially developed nations. Explain why this digital divide exists. Describe the effects of this form of digital divide.

6. The digital divide  →  6.1. The digital divide

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5

D’Oliveira Inc. is a company which sells stationery products to many stores. The company uses a transaction file to keep a record of the number of products it has sold each month. Part of a transaction file is shown. It contains: • ProductID • NumberSold (the number of that product sold in a particular month) Part of the master file used by the company is also shown. It contains: • ProductID • Product (description of product) • NumberinStock (how many of that product are left in stock) The NumberinStock on the new master file is calculated every month by subtracting the NumberSold from the NumberinStock on the old master file. Transaction file Master File ProductID NumberSold ProductID Product NumberinStock Folder wallets Ring binders Notepads A4 paper A3 paper HB pencils Pencil cases Maths sets Identify the two processes that would have been performed on the transaction file before the master file could be updated. List the steps involved when the master file is updated using the transaction file. Use the data shown in . Stop at the step where the third master file record is read.

1. Data processing and information  →  1.5. Data processing

10. Database and file concepts  →  10.4. File and data management

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6

Back-up software is a type of utility software. A network manager wants to back up the data stored on a server. Describe, with reasons, the steps the manager takes when setting up this process. Some of the data to be backed up consist of audio files. The network manager will compress these before starting the back-up process. Different methods of compression can be used. Describe these methods giving the effects on the audio files of using each method.

11. Video and audio editing  →  11.2. Audio editing

2. Hardware and software  →  2.3. Utility software

Open

7

A computer system is used to monitor the level of pollution in the air. Describe how the system would collect, process and display the data.

16. System life cycle  →  16.3. Design

1. Data processing and information  →  1.5. Data processing

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8

Complete this flowchart which will allow the input of ten numbers. • A number is even if the number divided by 2 is an integer. • If a number (N) is odd, it will be added to the odd total (OT). • If a number (N) is even, it will be added to the even total (ET). • Both these totals will be output after the tenth number has been processed. Start Stop count count + 1 ET ET + N

4. Algorithms and flowcharts  →  4.2. Flowcharts

4. Algorithms and flowcharts  →  4.1. Algorithms

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9

Vishing is a method used by fraudsters to obtain banking information from bank customers by phoning them. Evaluate the methods that bank customers could use to prevent becoming a victim of vishing.

Open

10

The quality of sound produced from the data stored on an optical disk depends on the sampling resolution. Describe what is meant by sampling resolution.

11. Video and audio editing  →  11.2. Audio editing

14. Communications technology  →  14.5. Data transmission across networks

Open

11

Isabella is concerned about the amount of traffic in her local area. She is going to interview all the nearby families to discover if the amount of traffic is caused mainly by local families driving short distances. It will take her a week to collect the data. Justify the use of direct sources such as interviews in this scenario.

1. Data processing and information  →  1.1. Data and information

Open