A Frightening Experience

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  • Topic: Computer, Data, General Certificate of Secondary Education
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  • Published : February 27, 2013
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS

for the guidance of teachers

0420 COMPUTER STUDIES
0420/11

Paper 11, maximum raw mark 100

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes must be read in conjunction with the question papers and the report on the examination.



CIE will not enter into discussions or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the May/June 2010 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

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MARK SCHEME for the May/June 2010 question paper

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International General Certificate of Secondary Education

Page 2
1

Mark Scheme: Teachers’ version
IGCSE – May/June 2010

Syllabus
0420

Paper
11

(a) video conferencing
Any two points from:
– meeting between 2 or more participants
– using computer networks/Internet
– to transmit audio/video data in real time
– pictures appear in a window on a monitor in real time
– reference to hardware (webcams, speakers, microphones)
– reference to software (communications, compression)

[2]

(b) simulation
Any two points from:
– studying the behaviour of a system
– by using a model/mathematical representation
– results can be predicted
– e.g. flight (or other) simulator, modelling hazardous chemical processes – e.g. 10-pin bowling computer game

[2]

(c) interrupt
Any two points from:
– a signal/request generated by a device/program
– which causes a break in the execution of a program/stops the program – e.g. printer out of paper, key pressed, disk full

[2]

(d) batch processing
Any two points from:
– processing doesn’t start until all data is collected
– JCL (any reference to Job Control Language)
– no need for user interaction
– processed all in one go
– done at “quiet” times
– output not time sensitive
– e.g. billing, payroll, cheque processing

[2]

(e) expert system
Any two points from:
– computer system that emulates/simulates human knowledge/contains knowledge of human expert
– uses an inference engine
– contains a knowledge base
– made up of rule base
– reference to expert system shell
– outputs probability of diagnosis given being correct/produces reasoned conclusions – uses “Yes/No”, multichoice interface
– e.g. medical diagnosis, chess, prospecting, financial modelling, diagnostics [2]

© UCLES 2010

Page 3
2

Mark Scheme: Teachers’ version
IGCSE – May/June 2010

Syllabus
0420

Paper
11

4

[2]

(a) Any two features from:
– sound and/or video clips embedded in the presentation/multimedia – animation effects
– diagrams/graphs/charts (in colour)/colour/text fonts etc – hyperlinks

[2]

(b) Any two from:
– how it affects tasks such as filing/ordering etc.
– retraining aspects
– deskilling aspects
– unemployment

3

Any two tasks from:
– design data collection forms
– design input forms/user interface
– design systems flowcharts
– design output forms/reports/screens
– design/select validation rules
– design/select verification methods
– design test plan/strategy
– specify/select hardware
– specify/select software
– design algorithms/program flowcharts/pseudocode
– specify data structures
– design files (structures)/tables / layout
– design queries

[2]

Any three different reasons and associated preventions
(prevention must match reason):
1 mark for reason, 1 mark for prevention
award each point only once
data corruption and data loss
viruses -use anti virus software, firewalls, no Internet access...
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