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WorksheetsSensors and Scanners IGCSE Computer Science
Total questions: 91
Worksheet time: 26mins
Name
Class
Date
1.
What is a sensor?
a)
Hardware devices that measures physical properties
b)
A digital machine that changes things
c)
A physical machine that changes things
d)
Something that notices a change in something
2.
What do gas sensors measure?
a)
Levels of different gases
b)
Light
c)
Sound
d)
Temperature
3.
What do infra-red sensors measure?
a)
Motion/heat
b)
Sound
c)
Acidity
d)
Pressure
4.
What do light sensors measure?
a)
Light
b)
Acidity
c)
Pressure
d)
Humidity
5.
What do temperature sensors measure?
a)
Temperature
b)
Pressure
c)
Motion/heat
d)
Light
6.
What do pressure sensors measure?
a)
Pressure
b)
Sound
c)
Light
d)
Sound
7.
What do humidity sensors measure?
a)
Humidity
b)
Pressure
c)
Motion/heat
d)
Light
8.
What do acoustic sensors measure?
a)
Pressure
b)
Light
c)
Sound
d)
Level of different gases
9.
What do pH sensors measure?
a)
Acidity
b)
Pressure
c)
Level of different gases
d)
Sound
10.
What do magnetic field sensors measure?
a)
Magnetism
b)
Motion/heat
c)
Pressure
d)
Light
11.
What are control systems?
a)
Systems can take control and alter how a process is altering
b)
Systems that just report information
12.
What are examples of control systems?
a)
Air conditioning
b)
Monitoring a patients vitals in intensive care
c)
Traffic light control
d)
Monitoring pollution levels
13.
What are monitoring systems?
a)
Systems that just report information
b)
Systems can take control and alter how a process is altering
14.
What are examples of monitoring systems?
a)
Monitoring a patients vitals in intensive care
b)
Air conditioning
c)
Monitoring pollution levels
d)
Traffic light control
15.
What are barcode scanners?
a)
Device to read barcodes and transmit data to computer
b)
Scans QR codes
c)
Scans for viruses
d)
Scans for changes in the environment
16.
Which type of barcode scanner represents only numbers
a)
UPC-A
b)
Code 128
17.
Which type of barcode scanner represents letters and numbers
a)
Code 128
b)
UPC-A
18.
What are guard bars in a bar code?
a)
Two long lines placed at start middle and end
b)
The protector of viruses
c)
A type of firewall
d)
Bars that allow scanning after permission
19.
What does the left side of the barcode represent?
a)
Manufacturer of the product
b)
Unique ID number of the product
c)
The database password
d)
The database username
20.
What does the right side of the barcode represent?
a)
Unique ID number of the product
b)
Manufacturer of the product
c)
The database username
d)
The database password
21.
What is the check digit in a barcode?
a)
Error checking number
b)
Checks if the product is damaged
c)
Checks if the product is genuine
d)
Checks if there is stock left
22.
How many segments is each line broken down into in a barcode?
a)
7
b)
5
c)
9
d)
10
23.
What is the most common use of barcodes?
a)
Store a product ID number
b)
Link to websites
c)
Create an object
d)
Monitors changes
24.
Is the right side of a barcode the inverse of the left in terms of light and dark bars coding the numbers?
a)
Yes
b)
No
c)
Not always
25.
What are 2D scanners used for?
a)
Converting a physical document into a digital version
b)
Outputs a digital file
c)
Outputs a physical file
d)
Converts a digial document to a physical one
26.
What is the first step of 2D scanning?
a)
User opens lid and places document face down on glass pane
b)
The user will close the lid and press scan
c)
User opens lid and places document face down on glass pane
d)
Data stored on computer digitally
27.
What is the second step of 2D scanning?
a)
The user will close the lid and press scan
b)
User opens lid and places document face down on glass pane
c)
Put on light sensitive sheet. Pixels record light intensity.
d)
Data stored on computer digitally
28.
What is the third step of 2D scanning?
a)
Bright light is shone on the paper and moves across it
b)
Data stored on computer digitally
c)
User opens lid and places document face down on glass pane
d)
The user will close the lid and press scan
29.
What is the fourth step of 2D scanning?
a)
Light goes through paper, producing an image - sent to lens
b)
Put on light sensitive sheet. Pixels record light intensity.
c)
Data stored on computer digitally
d)
User opens lid and places document face down on glass pane
30.
What is the fifth step of 2D scanning?
a)
Put on light sensitive sheet. Pixels record light intensity.
b)
Light goes through paper, producing an image - sent to lens
c)
User opens lid and places document face down on glass pane
d)
Data stored on computer digitally
31.
What is the sixth step of 2D scanning?
a)
Data stored on computer digitally
b)
User opens lid and places document face down on glass pane
c)
Put on light sensitive sheet. Pixels record light intensity.
d)
The user will close the lid and press scan
32.
What does OCR stand for?
a)
Optical character recognition
b)
Over character recognition
c)
Optical character reorganization
d)
Optic chess recognition
33.
What is step one of OCR?
a)
Checks if black & white dots match char. in reference file
b)
Converts it into a digital form
c)
Prints it out
d)
Send it to the cloud
34.
What is step two of OCR?
a)
Adds any matches to the document
b)
Send it to the clud
c)
Checks if black & white dots match char. in reference file
d)
Prints it out
35.
Why is OCR useful?
a)
It allows us to edit docs that were images before
b)
Automatically prints images out
c)
Sends docs to the clud
36.
What is facial recognition?
a)
Identifies people from their facial features
b)
Prints images of faces to the cloud
c)
Allows us to scan for any viruses in people
37.
What is step 1 of facial recognition?
a)
An image of your face is taken by a camera
b)
Compares facial proportions to passport image
c)
Your passport is scanned by a 2d scanner
d)
There is no step 1
38.
What is step 2 of facial recognition?
a)
Your passport is scanned by a 2d scanner
b)
Compares facial proportions to passport image
c)
Compares facial proportions to passport image
d)
There is no step 2
39.
What is step 3 of facial recognition?
a)
Compares facial proportions to passport image
b)
The faces are then printed out and physically compared
c)
An image of your face is taken by a camera
d)
There is no step 3
40.
What is step 4 of facial recognition?
a)
There is no step 4
b)
An image of your face is taken by a camera
c)
Compares facial proportions to passport image
d)
Your passport is scanned by a 2d scanner
41.
In which industries has 3D scanning had the most impact?
a)
Medical
b)
Educational
c)
Industrial
d)
Agriculture
42.
How does 3D scanning work in the medical field?
a)
Scans human body to get a closer look at possible problems
b)
Prints organs out
c)
Prints medical supplies out
d)
Cures cancer through chemotherapy
43.
How does 3D scanning work in the industrial field?
a)
Tools can be scanned and altered using 3D software
b)
It can scan buildings and create identical ones
44.
What process do 3D scanners use?
a)
Tomography
b)
Typography
c)
Imagography
d)
Geography
45.
How does tomography work?
a)
Takes images in very thin slices, then creates a whole image
b)
Looks at it from a top-down perspective
c)
Looks at it from a bottom-up perspective
d)
It hasn't been perfected yet
46.
What do digital cameras do?
a)
Capture images and save as binary files
b)
Converts binary files to physical images
c)
Not much
d)
Allow people to sharpen ready-made images
47.
What is step 1 of taking a picture?
a)
Camera breaks up what it sees in its lens to grid of pixels
b)
Shutter opens, lets light on CCD sensor at the back of lens
c)
Intensity of light is measured
d)
Information is stored digitally in camera's memory
48.
What is step 2 of taking a picture?
a)
Shutter opens, lets light on CCD sensor at the back of lens
b)
Camera breaks up what it sees in its lens to grid of pixels
c)
Intensity of light is measured
d)
Information is stored digitally in camera's memory
49.
What is step 3 of taking a picture?
a)
Intensity of light is measured
b)
Shutter opens, lets light on CCD sensor at the back of lens
c)
Camera breaks up what it sees in its lens to grid of pixels
d)
Intensity of light is measured
50.
What is step 4 of taking a picture?
a)
Information is stored digitally in camera's memory
b)
Intensity of light is measured
c)
Shutter opens, lets light on CCD sensor at the back of lens
d)
Camera breaks up what it sees in its lens to grid of pixels
51.
What is step 5 of taking a picture?
a)
There is no step 5
b)
Image is sharpened
c)
Image is sent to device
d)
Image is printed
52.
When were QR codes created?
a)
1974
b)
1989
c)
1969
d)
1993
53.
What were QR codes first used for?
a)
Allow Japanese car makes to track car parts
b)
Send links to each other through mail
c)
Send digital messages via paper
d)
No use at first
54.
Which of these is an advantage of QR codes?
a)
Can store 100 times more info than normal barcode
b)
Is ugly
c)
Doesn't work sometimes
55.
Which of these is an advantage of QR codes?
a)
Can be scanned in any direction
b)
Doesn't work sometimes
c)
Is ugly
56.
Which of these is an advantage of QR codes?
a)
Can be easily scanned with a QR app
b)
Is ugly
c)
Doesn't work sometimes
57.
Which of these are uses of QR codes
a)
Links to websites
b)
Send money directly
c)
Allow users to 3D scan
d)
None
58.
Which of these are uses of QR codes
a)
Business cards
b)
Allow users to 3D scan
c)
Send money directly
d)
None
59.
Which of these are uses of QR codes
a)
Link to an App
b)
Send money directly
c)
Allow users to 3D scan
d)
None
60.
Which of these are uses of QR codes
a)
Provide WIFI passwords
b)
Allow users to 3D scan
c)
Send money directly
d)
None
61.
Which of these are uses of QR codes
a)
Allow for discounts in supermarkets
b)
Send money directly
c)
Allow users to 3D scan
d)
None
62.
Which of these are uses of QR codes
a)
Add contacts
b)
Allow users to 3D scan
c)
Send money directly
d)
None
63.
Which of these are uses of QR codes
a)
Display ads
b)
Send money directly
c)
Allow users to 3D scan
d)
None
64.
Which of these are uses of QR codes
a)
Act as plane boarding passes
b)
Allow users to 3D scan
c)
Send money directly
d)
None
65.
Which of these is a disadvantage of QR codes
a)
Ugly
b)
Can store 100 times more info than normal barcode
c)
Can be scanned in any direction
d)
Can be easily scanned with a QR app
66.
Which of these is a disadvantage of QR codes
a)
Doesn't work sometimes
b)
Can be easily scanned with a QR app
c)
Can store 100 times more info than normal barcode
d)
Can be scanned in any direction
67.
Which of these is a disadvantage of QR codes
a)
Can link to viruses
b)
Can be scanned in any direction
c)
Can be easily scanned with a QR app
d)
Can store 100 times more info than normal barcode
68.
What are the purpose of the large squares on QR codes?
a)
So software determines orientation
b)
So we notice them
c)
So it looks nicer
d)
None
69.
Which of the following is an application of barcode scanners:
a)
Automatic stock control
b)
Voice recognition
c)
Monitor soil in a greenhouse
d)
Reading passports
70.
Which of the following is an application of pH sensors:
a)
Monitor soil in a greenhouse
b)
Automatic stock control
c)
Voice recognition
d)
Monitor soil in a greenhouse
71.
Which of the following is an application of a scanner:
a)
Reading passports
b)
Voice recognition
c)
Automatic stock control
d)
Voice recognition
72.
Which of the following is an application of light sensors:
a)
Control street lights
b)
Monitor water levels in a drier
c)
Detection of intruders
d)
Monitor pollution levels in a river
73.
Which of the following is an application of moisture sensors:
a)
Monitor water levels in a drier
b)
Control street lights
c)
Monitor pollution levels in a river
d)
Detection of intruders
74.
Which of the following is an application of gas sensors:
a)
Monitor pollution levels in a river
b)
Detection of intruders
c)
Control street lights
d)
Monitor water levels in a drier
75.
Which of the following is an application of pressure sensors:
a)
Detection of intruders
b)
Monitor pollution levels in a river
c)
Monitor water levels in a drier
d)
Control street lights
76.
What are actuators?
a)
Motors with sensor to control mechanisms
b)
Give accurate readings
77.
Which is an example of an actuator:
a)
Opening a door
b)
Measuring oxygen levels
c)
Measuring acidity levels
78.
Fill in blank: Input devices ------- data from the source in the outside world to the computer
a)
Capsulate
b)
Give
c)
Transfer
d)
Collect
79.
What are the two types of barcode readers we have learnt about?
a)
Code 182 and UPC - A
b)
Code 128 and A - UPC
c)
Code 182 and A - UPC
d)
Code 128 and UPC - A
80.
Code 128 is usually used in...
a)
Trasport Tracking
b)
Shipment Tracking
c)
Warehouse Tracking
d)
Retail Tracking
81.
UPC-A represents letters and numbers while Code 128 can represent only numeric digits
a)
YES YES YES YES
b)
NO NO NO NO
c)
MAYBE?????
d)
THIS IS THE RIGHT ASNWER
82.
Which barcode system is used in retail and warehosing?
a)
UPC-A
b)
NONE
c)
CODE 128
d)
Trick question that doesn't exist
83.
what is the number of guard bar(s) are found in the anatomy of a UPC - A barcode?
a)
2
b)
1
c)
3
d)
4
84.
In a UPC - A barcode system, what does the left side represnt?
a)
product number
b)
retail number
c)
price
d)
manufacturer number
85.
In a UPC - A barcode system, what does the right side represent?
a)
retail number
b)
manufacturer number
c)
product number
d)
price
86.
true or false - in barcode scanners, white lines reflect more light
a)
true
b)
false
c)
true
d)
false
87.
what are QR codes?
a)
2d barcodes that can be read my smartphones and tablets
b)
3d barcodes that can be read my smartphones and tablets
88.
Computer output can be used to operate another device.
a)
true
b)
false
89.
What does a DAC stand for?
a)
Digital or Analogue Clock
b)
Don't Attack Computers
c)
Digital to Analogue Converter
d)
Click this one - it's correct.
90.
What does a DAC do?
a)
Changes a digital clock to analogue.
b)
Corrects the time on a clock.
c)
Protects computers.
d)
Converts digital data to analogue signals.
91.
What is used to boost a signal after it is converted by the DAC?
a)
Amplifier
b)
Booster seat
c)
Petrol
d)
Amplificator
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