IT Flashcards
WHAT IS OMR?
OMR= Optical mark recognition
It allows data from a multiple choice type form to be read quickly and accurately into a computer.
Advantage of OMR
It can be quicker at having the data than typing it.
Disadvantages of OMR
Forms will need to be carefully designed to make sure marks are correctly positioned
There could be problems if the form is messy and not correctly filled.
OCR Advantages
Faster than usual when you type the data
There is no involved of typing it
Disd of OCR
System could have difficulty reading the information on the item that is scanned to.
Not really an accurate technique
Magnetic ink character reader disd
Disadvantage: Some characters could be read.
It is much more expensive than other methods of direct data entry.
Advan Magnetic ink character reader
There is no manual input, so error will be reduced. Magnetic ink still
can be read even if somebody wrote over them.
Barcode reader advan
Much faster than putting in the data. Trusted and it has secure technology.
Dis of barcode reader
It usually costs a lot. It can be easily damaged than than magnetic stripe
Adv of QR CODE
Qr code can hold up to 7000 digits, but normal barcodes only can hold up to 30.
Adv: You don’t need to add the numbers for each digit. All you need to do is scan them.
State two tasks carried out by an operating system.
Provide user interface
* Manage applications software
* Manages computer memory
* Manages computer security
* Manages input/output devices
A computer is used to help organise a school festival. Name two types of software
applications (not software names) which could be used. And for each type of
software, write down in which they could be used.
Spreadsheet
To calculate the school festival budget
Database
Names/addresses of helpers (parents/pupils)/local companies
(for sending letters)
Word processing
Letters to parents/community advertising fete
Letters to local companies for sponsorship
State one advantage and one disadvantage of using a laptop computer rather than a
desktop computer.
Advantage: laptop can be used in different room.
Disadvantage
Not easy to use the trackpad compared to using mouse. Screen is smaller than
desktop. Has battery limit to use. Easily broken. Easily stolen
Why use computer to measure instead of person?
More reliable= computer will not forget to take the readings
accuracy= the computer will read the data more accurately than a person
Response time= Computers can react much quicker to data received. For example, if a patient’s heart rate drops to critical levels an alarm could be sounded automatically.
Work longer= Computers can read the data all day, everyday without getting bored or tired
Frequency of readings= computers can read the data more frequently than humans can (1000’s of times a second ig needed)
What’s the conversion of sensor?
a sensor measures a specific data and ends as a signal to the computer. Usually this is an analogue signal so it needs to be converted into digital data for the computer to process/read. This is done using by an Analogue-to-Digital converter (ADC)