Worksheet

Wroksheet 1 for grade-10 students
1. An automatic weather station is situated on the roof of a school and is connected to a computer in the class room. The station has an anemometer to measure the speed of the wind.
(a) The computer cannot use the data directly from the anemometer.
i. Why is this the case?
ii. What device is needed to solve this problem?
(b) Give two advantages of using this system.

2. Rashidh enjoys playing computer games. He often downloads demonstration version of games from the internet. One day he discovers his computer system is producing lots of error messages. Several important data files have been disappeared. His computer has a virus.
a. What is a computer virus?
b. Suggest how the virus may have got into Rashidh’s computer system?
c. How can Rashidh remove the virus from the computer system?
d. What precautions can Rashidh take to help prevent more viruses getting into his computer?

3. A life insurance company stores information about its customers on a large database.
a. Give three fields other than name and address which might be included on the file.
b. The insurance company as a data user must obey the rules set out in the data protection act. Give four rules that data user must obey.
c. Give two rights the data protection act gives to the customers.

4. Describe how an medical diagnosis expert system help a doctor to identify the diseases.

5. An international company has changed from a manual filing system to a computer-based system.
(a). When compared with the manual filing system, state two benefits to the company of using the computer-based system.
(b). State two effects on the staff due to the introduction of a computer-based system.
(c). (i). Give one reason why the company used parallel running as the method of changing from the manual system to the computer-based system.
(ii). Give one example of an application for which parallel running would not be a suitable method of changeover.

6. A company uses computer aided design (CAD) to help design buildings.
a. Give three features of CAD which would be useful for this task.
b. Give an example of a suitable output device used when

I. looking at and developing the design.

II. producing a very large drawing on paper.