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9626_s22_qp_12

A paper of Information Technology, 9626

Questions:

9

Year:

2022

Paper:

1

Variant:

2

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1

Some students have been asked by their teacher to carry out a study. They will collect data about the families living in five streets close to their school. They will carry out the study using direct data sources and will not use records from the 2020 census which are kept at the city hall. Describe the suitability of using direct data sources rather than the census data for the study.

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

Open

2

Encryption has many uses, including the encryption of hard disks. Describe hard disk encryption.

1. Data processing and information → 1.3. Encryption

Open

3

Julia is setting up a hairdressing business. She has recruited several staff. She is creating a database of all her staff and has written down all their details ready for entering into a computer. She will need to verify the data when it is entered. She has been told that she cannot use a parity check but should use visual verification and double data entry. By describing what is meant by a parity check, explain why it might not be suitable in this scenario. Compare the similarities and differences between the visual checking and double data entry methods of verification.

1. Data processing and information → 1.4. Checking the accuracy of data

Open

4

The performance of mainframe computers and supercomputers is often measured using performance metrics. Compare, by describing the similarities and differences between them, the different types of performance metrics.

2. Hardware and software → 2.1. Mainframe computers and supercomputers

Open

5

When a high level language program is written, it has to be translated so the computer can run it. This can be achieved using a compiler or an interpreter. Discuss the advantages and disadvantages of using a compiler rather than an interpreter.

2. Hardware and software → 2.2. System software

2. Hardware and software → 2.4. Custom-written software and off-the-shelf software

Open

6

Sensors are used in monitoring systems to measure physical variables. It is important that sensors are calibrated before use. Describe, in detail, these sensors and give an appropriate use for each. Each use must be different. Humidity Sound Explain the importance of calibration. Describe the differences between one point calibration and two point calibration.

3. Monitoring and control → 3.1. Monitoring and measurement technologies

3. Monitoring and control → 3.2. Control technologies

Open

7

Josefine has started to draw a flowchart which inputs 10 numbers and outputs the largest value. Complete the flowchart by filling in the empty boxes and by placing yes and no as appropriate in the diagram. Start Stop count 0 max 0 Input number

4. Algorithms and flowcharts → 4.2. Flowcharts

3. Monitoring and control → 3.2. Control technologies

Open

8

Pharming is a method used by hackers to obtain information from bank customers. Explain what is meant by pharming. Describe three methods a customer could use to minimise the risk of becoming a victim of pharming.

5. eSecurity → 5.1. Personal data

14. Communications technology → 14.9. Network security

Open

9

Many companies use computers to process their payroll. A transaction file is produced once a week. It consists of the WorkerID and HoursWorked fields. The master file contains the WorkerID, RateOfPay and WagesSoFar fields as well as other details. The WagesSoFar field represents how much each worker has earned so far this year. Each worker’s wage is calculated by multiplying the HoursWorked by the RateOfPay. When the wage for that week is calculated, it is added on to the WagesSoFar field. Every week the master file has to be updated to include the new wage earned so far this year. Complete the following pseudocode algorithm which shows the process of updating the master file. You can assume no other transactions are being carried out. READ first record in transaction file READ first record in old master file WHILE not end of transaction file IF transaction file WorkerID = master file WorkerID THEN Updating a master file in a payroll system is an example of batch processing. Discuss the advantages and disadvantages of using batch processing, compared to other types of processing, for a payroll system.

1. Data processing and information → 1.5. Data processing

4. Algorithms and flowcharts → 4.1. Algorithms

Open