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ICT Unit 3 Revision 2021
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ICT Unit 3 Revision 2021
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ICT Unit 3 Revision 2021Copyright, Designs and Patents Act 1988 - correct answer-It is illegal to share copyrighted
material (art, photos, music, movies etc) without the copyright holder's permission.
Fair Use - correct answer-allow the lawful use or reproduction of work without having to seek
permission from the copyright owner(s) or creator(s) or infringing their interest under specific
circumstances.
Creative Commons - correct answer-A kind of copyright that makes it easier for people to
copy, share, and build on your creative work, as long as they give you credit for it.
Copyright law restrict you from making modification (True or False) - correct answer-True
Copyright law allows you to make copies to give to a friend (True or False) - correct
answer-False
Copyright law allows you to make copies to sell to a friend (True or False) - correct
answer-False
Data Validation - correct answer-A rule or check that is used to make sure data is sensible.
range check - correct answer-Validation technique. Ensures a field is between a certain
range of values.
Invalid character check - correct answer-Validation rule to make sure that the correct
characters are used in a field
Format check - correct answer-Validation rule to make sure the data follows the correct
format e.g. Post Code.
Field Length check - correct answer-Checks to make sure a field is a specified length. E.g.
password has a minimum of 8 characters
check digit - correct answer-A one-digit character found on bar codes used to check that the
data entered is valid.
Transcription errors - correct answer-data entry errors that occur when a user is entering
data from a printed document or from verbal instructions
Transposition errors - correct answer-Error that occurs when digits are accidentally swapped
around Input : Gergory Instead of : Gregory
Verification - correct answer-Checking data is copied correctly by entering the data twice or
comparing to another copy.
, Double keying - correct answer-Enter data twice to check for a match. e.g. new passwords
Visual check - correct answer-A verification check where The user checks the data visually
Spell Check - correct answer-Verification check the spelling of a document by comparing to
a dictionary on the computer.
Data logging - correct answer-Automatic recording of data using sensors.
Sensor - correct answer-A device that responds to a physical stimulus (as heat, light, sound,
pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for
measurement or operating a control).
Advantages of Data logging - correct answer-Respond very quickly to change
Run 24 hours a day
Operate in dangers conditions
Accurate measurements
Data can be processed quickly
Can be timed to start at different periods
Share data easily
Remote access to sensors
Control Systems - correct answer-a computer or microprocessor which uses a program to
handle data from sensors to output control signal to operate an object or system.
Actuator - correct answer-A device to produce physical movement based on output from a
computer system.
Analogue data - correct answer-Continuous data which can have a range of values.
Computers need to convert this data into digital form.
security system sensors - correct answer-Motion sensors can detect movement. Heat
sensors can be used to detect human body heat.
Automatic door sensors - correct answer-Uses PIR to detect movement and an actuator
open doors when someone comes near. A pressure sensor is used to make sure a person
does not get trapped in closing doors.
Traffic control sensors - correct answer-Some traffic lights use traffic detection loops. In other
words, they can detect when a car goes over that part of the road and can turn green.
Car park sensors - correct answer-These use cameras, npr(number plate readers),
actuators(switches) for barriers and ticket scanners to control access to the car park.
Greenhouses sensors - correct answer-Heat sensors can tell actuators to open a window if it
becomes too hot or turn on a heater if it is too cold. Humidity sensors could also be used to
control sprinklers.
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