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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

Carolina Perez Zurovesky

COMPUTER STUDIES 0420/01

Paper 1 October/November 2007

2 hours 30 minutes
Candidates answer on the Question Paper. No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

Write your Centrenumber, candidate number and name on all the work you hand in. Write in dark blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.

Answer all questions.
No marks will be awarded for using brand names of software packages or hardware.

At the endof the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.

For Examiner's Use

This document consists of 20 printed pages.

IB07 11_0420_01/5RP
© UCLES 2007 [Turn over
2

1 Explain, with examples, the following five computerterms:

(a) byte

For Examiner's Use

A byte represents a 8 bits, a character in a unit of memory

[pic]

(b) CD-ROM

[2]

It’s a portable storage medium which can be read only and whose data cannot be changed

[pic]

(c) interrupt

[2]

It’s a signal generated by a device that makes theprogram stop

[pic]

(d) buffer

[2]

It’s a temporary memory that allows speed of devices to be matched and to hold data being transferred between peripherals and CPU

[pic]

(e) virtual reality

[2]

It consists of computer simulation like a 3D world. It needs a special input devices to interact like gloves

[pic]© UCLES 2007 0420/01/O/N/07

[2]
3

2 Give two differences between high level languages and low level languages.

1 high level language allows one to make many relationship whereas low level language allows only a relationship from one to one

2 high level language is not difficult to read because is close to English language, butlow level language can be difficult to understand

[pic]

3 (a) Give three of the elements that make up an Expert System.

1 knowledge base

[2]

For Examiner's Use

[pic]

2 rule base

[pic]

3 inference engine

[3]

(b) Give an example of the use of an Expert System.

Computer games
[pic]

[1]© UCLES 2007 0420/01/O/N/07 [Turn over
4

4 Online banking using the Internet is now increasing.

(a) Give one advantage to the customer of using online banking.

For Examiner's Use

He or she can bank from home

[pic]

(b) Give one advantage to the bank of providing online banking.

[1]larger customer base

[pic]

(c) Online banking has an impact on society as a whole.

(i) Give one positive effect.

[1]

less pollution
[pic]

[pic]

[pic]

(ii) Give one negative effect.

closing down of branches

[pic](d) Describe two concerns people might have regarding online banking.

1 fraud

[2]

[pic]

2 viruses

[2]

© UCLES 2007 0420/01/O/N/07
5

5 (a) (i) Name one method used to protect data against unauthorised access.

firewall

[1]

For Examiner's...