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Worksheets3. Hardware - Input & Output Devices: Computer Science CIE IGCSE
Total questions: 50
Worksheet time: 32mins
Anything that allows data to be entered into a computer system
Input Device
Embedded system
Output device
Integrated circuit
Made up of a series of light and dark parallel lines
Barcodes
QR codes
Input Devices
Scanners
Give an example of a barcode standard
USP
DBS
UPC
CDU
What does UPC stand for?
Universal Product Code
Universal Protocol Control
Unit of Perfect Colour
Umbridge Perfects Custard
What are barcodes used in?
Shops
Libraries
Parcels in courier/post services
Museums
Airport boarding passes
What do unique series of lines represent in barcodes?
The numbers 0-9
The letters of the alphabet
Me
URLs
What are the two long bars at the ends of a barcode called?
(a)
What are guard bars for?
They allow the barcode to be scanned from any angle
They ensure that the scanner is at the correct distance from the barcode.
They ensure that the lines to not spill over onto white paper.
They prevent binary escape.
What is each digit in a barcode represented by?
2 dark lines
2 white lines
1 Dark line
1 white line
Describe the left hand side of a barcode:
Has an odd number of elements
Has an even number of elements
Always begins with a dark bar
Always begins with a light bar
Describe the right hand side of a barcode:
Has an odd number of elements
Has an even number of elements
Always begins with a dark bar
Always begins with a light bar
How thick is the thickest that bars in a barcode can be?
1 block
2 blocks
3 blocks
4 blocks
What are barcodes scanned by?
A red laser/red LED
A camera
UV light
The EM spectrum
What is the reflected light from a barcode read by?
(a)
When using barcodes and a database, stock is automatically re-ordered when it drops below the re-order level.
True
False
When using barcodes and a database, ordered stock is manually logged on arrival.
True
False
Select the advantages of using barcodes.
No need to put individual sticker price on item - database stores them all
Easy to change price of items
Automatic stock control
Manual data logging
Cheaper
Select the advantages of using barcodes.
Checks buying habts of customers
Fast, easy checkout
Reduction in till errors
Automatic customer recognition
Better for the customer's metal health
Select the advantages of using barcodes.
Customer has itemised bill
Cost savings passed to customers.
Stock control means fresher food
Stress reduction
Reduction in till rage
Select the advantages of using barcodes.
Track of sell-by dates
Up-to-date sales info & trends
Possible to link barcodes to loyalty cards.
Automatic shopping
Anti-damage
Select the disadvantages of using barcodes.
Barcodes could be damaged
If missing, item cannot be entered at till.
Unknown barcode - item cannot be sold.
Harder for customer to see prices.
Studies have shown that the monochromatic colours can lead to depression.
Barcodes are...
1D
2D
3D
4D
QR codes are...
A form of barcode
2D
Square
Rectangular
3D
What does QR stand for?
Quick Response
Quiet Rest
Quibbler Reconnaissance
Quantum Register
What are the 3 large black squares on the corners of a QR code called?
Matrix
Module
QRs
Quinters
What are modules used for?
Orientation so a QR code can be scanned from any angle
Size so that the coder can ensure his QR code is neither too big nor too small.
They store the hop number
They store the manufacturer's number
Select the uses of QR codes
Shopping
Track and Trace
Marketing and advertising
Couriers
Music
Select the uses of QR codes
Books
Access to a website/phone number
Electronic boarding passes
Royal Mail
QR codes can allow internet access to be encoded within them
True
False
How many characters can a QR code hold? (maximum)
(a)
How many characters can a barcode hold? (maximum)
(a)
What is each module converted to when scanning a QR code?
A binary value
A hexadecimal value
A denary value
When a QR code is scanned, the user will be automatically sent to a website/phone app etc
True
False
When a barcode is scanned, the user will be automatically sent to a website/phone app etc
True
False
How is data physically stored in a QR code?
horizontally
vertically
How is data physically stored in a barcode?
horizontally
vertically
How many numbers (max) can a QR code store?
(a)
How many numbers (max) can a barcode store?
(a)
Can barcodes store URLs?
Yes
No
Can QR codes be generated for free?
Yes
No
What can a QR code store?
A variety of information
numbers
letters
binary
What can a barcode store?
A variety of information
numbers
letters
binary
Can have a built-in error checking system
QR code
Barcode
Easier to transmit as text messages or images:
QR codes
Barcodes
Cheaper
QR codes
Barcodes
Can be encrypted
QR codes
Barcodes
Safer
QR codes
Barcodes
Can partial QR codes still be used?
Yes
No
Are QR codes efficient storage?
Yes
No
What are disadvantages of QR codes?
Require a reader
Not as common as barcodes
Difficult to make
Expensive
