Direct Input Devices

Question 1

Give the 3 elements of RFID

Answer 1

The RFID tag
The antenna
A decoder

Question 2

Give 3 advantages of RFID

Answer 2

The chips do not need to be positioned precisely on the scanner
RFID devices work within a few metres of the scanner
You can read and write data to RFID tags
Can be used for tracking items (luggage, animals, etc)

Question 3

Give 2 disadvantages of RFID

Answer 3

The tags do not have authentication
Can be affected by other electrical devices nearby

Question 4

Give 4 advantages of magnetic stripes

Answer 4

Simple for people to use
Its inexpensive
Entering data is fast
no errors on inputting data

Question 5

Give 2 disadvantages of magnetic stripes

Answer 5

Data can easily be lost if scratched or damaged
Very small storage capacity

Question 6

Describe how OMR works

Answer 6

A template is loaded onto the computer
A value is assigned to each lozenge
The scanner shines light onto the form and shows the position of each lozenge
The position is compared to the template and if the positon on the form and the positon on the paper are the same, the answer is marked correct

Question 7

Give 3 advantages of using OMR

Answer 7

It’s very fast at marking papers
Less errors are made
Much cheaper in the long run than hiring someone to mark multiple choice papers

Question 8

Give 2 disadvantages of using OMR

Answer 8

If the lozenge contains a wrong answer, the OM reader will mark it as correct
If the marks are not clear, the OM reader wont mark it